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Athena Power AP-U1ATX30P8 300W Single 1U IPC Server Power Supply - 80PLUS bronze
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Athena Power AP-U1ATX30P8 300W Single 1U IPC Server Power Supply - 80PLUS bronze
  • Main Connector: 20+4Pin
  • Output Current: +3.3@13A,+5V@13A,+12V1@14A, +12V2@14A, -12V@0.5A, -5V@0.5A, +5VSB@2.5A
  • Input Voltage: 90~264 Volts AC
  • Input Frequency Range: 47 - 63 Hz
  • Model #: AP-U1ATX30P8
  • Item #: N82E16817338086
  • Return Policy: Extended Holiday Return Policy
Athena Power AP-MFATX25P8 250W Single 80 PLUS Certified Server Power Supply for 1U Mini-ITX
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Athena Power AP-MFATX25P8 250W Single 80 PLUS Certified Server Power Supply for 1U Mini-ITX
  • Type: FlexATX
  • Main Connector: 20+4Pin
  • Output Current: +5V@12A, +3.3V@12A, +12V@14A, -12V@0.8A, -5V@0.5A, +5V-SB@2.5A
  • Input Voltage: 88 -264 Volts Ac
  • Model #: AP-MFATX25P8
  • Item #: N82E16817338052
  • Return Policy: Extended Holiday Return Policy
  •  
  • $75.99 
  • $4.99 Shipping
iStarUSA IS-400R8P 2 x 400 W Redundant PS2 Mini Server Power Supply
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iStarUSA Inc.
iStarUSA IS-400R8P 2 x 400 W Redundant PS2 Mini Server Power Supply
  • Type: Consumer Electronics
  • Main Connector: 20+4Pin
  • Output Current: +3.3V@24A, +5V@24A, +12V@30A, -12V@1A, -5V@0.5A, +5Vsb@2A
  • Input Voltage: 100 - 240 V
  • Model #: IS-400R8P
  • Item #: N82E16817147093
  • Return Policy: Extended Holiday Return Policy
Athena Power AP-P4ATX85FE SLI Ready Active PFC Supports Intel Core i7 & Skulltrail Platform Systems Server Power Supply
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Athena Power AP-P4ATX85FE SLI Ready Active PFC Supports Intel Core i7 & Skulltrail Platform Systems Server Power Supply
  • Main Connector: 20+4Pin
  • Output: +3.3V@24A, +5V@24A, +12V1@14A, +12V2@14A, +12V3@14A, +12V4@14A, -12V@0.8A, +5VSB@4A
  • Input Voltage: 88 -264 Volts Ac
  • Input Frequency Range: 50/60 Hz
  • Model #: AP-P4ATX85FE
  • Item #: N82E16817104126
  • Return Policy: Extended Holiday Return Policy
  •  
  • $187.99 
  • $6.99 Shipping
Athena Power AP-P4ATX60FE 600W Single EPS12V V2.91 SLI and CrossFire Ready Supports Intel Core i7 Server Power Supply
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Athena Power AP-P4ATX60FE 600W Single EPS12V V2.91 SLI and CrossFire Ready Supports Intel Core i7 Server Power Supply

Limited time offer, ends 12/16

  • Main Connector: 20+4Pin
  • Output Current: +3.3V@22A, +5V@22A, +12V1@18A, +12V2@18A, -12V@0.8A, +5VSB@3A
  • Input Voltage: 115 / 230 V
  • Input Frequency Range: 50/60 Hz
  • Model #: AP-P4ATX60FE
  • Return Policy: View Return Policy
Athena Power AP-U1ATX5020FEP8 500W 1U Single Standard Length (200mm) EPS12V/ATX12V IPC Sever Power Supply - 80PLUS Bronze - ActivePFC - OEM
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Athena Power
Athena Power AP-U1ATX5020FEP8 500W 1U Single Standard Length (200mm) EPS12V/ATX12V IPC Sever Power Supply - 80PLUS Bronze - ActivePFC - OEM
  • Main Connector: ATX Connector 24 (20+4) Pin x 1 P4-12V 4 Pin x 1 EPS-12V 8 Pin x 2 PCIE 6 Pin x 2 PCIE (6+2) Pin x 2 SATA 15 Pin x 6 Molex 4 Pin x 2 Floppy 4 Pin x 1
  • Output: +3.3V@18A +5V@20A +12V1@24A +12V2@24A -5V@0.5A -12V@0.5A +5V-SB@3.0A
  • Input Voltage: 88 ~ 264 Volts AC
  • Input Frequency Range: 50/60 Hz
  • Model #: AP-U1ATX5020FEP8
  • Item #: N82E16817338117
  • Return Policy: Extended Holiday Return Policy
  •  
  • $175.99 
  • $5.99 Shipping
Athena Power AP-P4ATX60FEP8 600W Server Power Supply - 80 PLUS Bronze
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in 30 days
Athena Power AP-P4ATX60FEP8 600W Server Power Supply - 80 PLUS Bronze
  • Type: 1U EPS
  • Main Connector: 20+4Pin
  • Output Current: +3.3V@18A, +5V@20A,12V1/V2@24/24A, -12V@0.5A, -5V@0.3A, +5Vsb@2.5A
  • Output: +5V@20A, +3.3V@18A, +12V1@24A, +12V2@24A, -12V@1.0A, +5V-SB@3.5A
  • Model #: AP-P4ATX60FEP8
  • Return Policy: View Return Policy
Sparkle Power FSP700UEB-B204 700W Server Power Supply
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Athena Power Zippy M1K2-5C01V4H 1200W 1U Redundant IPC/Server Power Supply - OEM
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Athena Power
Athena Power Zippy M1K2-5C01V4H 1200W 1U Redundant IPC/Server Power Supply - OEM
  • Main Connector: ATX Connector 24 (20+4) pin x 1 P4-12V 4 Pin x 1 EPS 12V 8 Pin x 2 PCIE 6+2 Pin x 2 SATA 15 Pin x 3 Molex 4 Pin x 3
  • Output Current: +3.3V@31A, +5V@36A,+12V@100A, +5Vsb@3A, @12V@0.5A
  • Input Voltage: 88 - 264 V
  • Input Frequency Range: 47 - 63 Hz
  • Model #: M1K2-5C01V4H
  • Item #: N82E16817338131
  • Return Policy: Extended Holiday Return Policy
  •  
  • $955.99 
  • Free Shipping
Athena Power AP-RRU2ATX608 600W Redundant 2U Micro redundant PSU - OEM
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Athena Power
Athena Power AP-RRU2ATX608 600W Redundant 2U Micro redundant PSU - OEM
  • Main Connector: ATX Connector 24(20+4) pin x 1 P4-12V 4 Pin x 1 EPS 12V 8 Pin x 2 PCIE 6+2 Pin x 2 SATA 15 Pin x 3 Molex 4 Pin x 3
  • Output: 3.3V-20A , +5V-20A, +12V-48A, +5Vsb-4A, -12V-0.3A
  • Input Frequency Range: 47 - 63 Hz
  • MTBF: 100,000 Hours on Maximum Load at +25 degree C
  • Model #: AP-RRU2ATX608
  • Item #: N82E16817338121
  • Return Policy: Extended Holiday Return Policy
Athena Power Zippy P2H-5400V 400W 2U Single IPC/Server Power Supply - 80Plus Standard - OEM
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Athena Power
Athena Power Zippy P2H-5400V 400W 2U Single IPC/Server Power Supply - 80Plus Standard - OEM
  • Main Connector: ATX Connector 24 (20+4) pin x 1 P4-12V 4 Pin x 1 EPS 12V 8 Pin x 2 SATA 15 Pin x 3 Molex 4 Pin x 3 Floppy 4Pin x 2
  • Output Current: +3.3V@22A, +5V@22A,+12V@32A, +5Vsb@3.5A, -12V@0.8A
  • Input Voltage: 88 - 264 V
  • Input Frequency Range: 47 - 63 Hz
  • Model #: P2H-5400V
  • Item #: N82E16817338124
  • Return Policy: Extended Holiday Return Policy
  •  
  • $259.00 
  • Free Shipping
Athena Power Hercules Series AP-MPS3ATX47EP Single PS2/PS3 4"(D) EPS-12V 470W PFC
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Athena Power
Athena Power Hercules Series AP-MPS3ATX47EP Single PS2/PS3 4"(D) EPS-12V 470W PFC
  • Main Connector: 20+4Pin
  • Output Current: +5V@17A, +12V1@13A, +12V2@13A, -12V@0.5A, +3.3V@18A, +5V-SB@2.5A
  • Input Voltage: 88 - 264 V
  • Input Frequency Range: 50/60 Hz
  • Model #: AP-MPS3ATX47EP
  • Item #: N82E16817338085
  • Return Policy: Extended Holiday Return Policy
Athena Power Zippy DP1H-5550V Zippy DC to DC 1U IPC Power 550W +/- 48V Input, 80+ Titanium - OEM
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Athena Power
Athena Power Zippy DP1H-5550V Zippy DC to DC 1U IPC Power 550W +/- 48V Input, 80+ Titanium - OEM
  • Output Current: +5V@25A, +12V@45A, -12V@0.8A, +3.3V@25A, +5Vsb@3A
  • Input Voltage: DC + - 48V
  • Input Frequency Range: 47 - 63 Hz
  • MTBF: 100,000 Hours on Maximum Load at +25 degree C
  • Model #: DP1H-5550V
  • Item #: N82E16817338144
  • Return Policy: Extended Holiday Return Policy
  • $209.99
  •  
  • $195.99 
  • Save: 6%
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Athena Power Zippy M1K2-5A00V4H 1000W 1U Redundant IPC/Server Power Supply - OEM
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Athena Power
Athena Power Zippy M1K2-5A00V4H 1000W 1U Redundant IPC/Server Power Supply - OEM
  • Main Connector: ATX Connector 24 (20+4) pin x 1 P4-12V 4 Pin x 1 EPS 12V 8 Pin x 2 PCIE 6+2 Pin x 2 SATA 15 Pin x 3 Molex 4 Pin x 3
  • Output Current: +3.3V@22A, +5V@22A,+12V@83A, +5Vsb@3A, -12V@0.5A
  • Input Voltage: 88 - 264 V
  • Input Frequency Range: 47 - 63 Hz
  • Model #: M1K2-5A00V4H
  • Item #: N82E16817338130
  • Return Policy: Extended Holiday Return Policy
  •  
  • $865.99 
  • $8.69 Shipping
TRIPP LITE SRCABLEVRT6 SMARTRACK Series 6" Wide High Capacity Vertical Cable Manager
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Athena Power Hercules Series AP-MPS3ATX40P8 Single PS2/PS3 4"(D) EPS-12V 400W PFC 82+ Bronze Certified
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Athena Power Hercules Series AP-MPS3ATX40P8 Single PS2/PS3 4"(D) EPS-12V 400W PFC 82+ Bronze Certified

Limited time offer, ends 12/16

  • Main Connector: 20+4Pin
  • Output Current: +5V@15A, -5V@0.5A, +12V1@11A, +12V2@11A, -12V@0.5A, +3.3V@15A, +5V-SB@2.5A
  • Input Voltage: 88 - 264 V
  • Input Frequency Range: 47 - 63 Hz
  • Model #: AP-MPS3ATX40P8
  • Return Policy: View Return Policy
Tripp Lite SmartRack 26U UPS-Depth Wall-Mount Rack Enclosure Cabinet, Hinged Back
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Tripp Lite
Tripp Lite SmartRack 26U UPS-Depth Wall-Mount Rack Enclosure Cabinet, Hinged Back
  • Type: Wall Mount Cabinet
  • Material: Steel
  • Specification: Form Factor:Wall Mountable
  • Unit Dimension: Height:49.6" x Width:23.6" x Depth:25.5"
  • Model #: SRW26USDP
  • Return Policy: View Return Policy
Athena Power AP-RRP4ATX6508 80 PLUS Certified 20+4Pin 2 x 500W Mini Redundant Server Power Supply
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Athena Power AP-RRP4ATX6508 80 PLUS Certified 20+4Pin 2 x 500W Mini Redundant Server Power Supply
  • Type: EPS12V
  • Main Connector: 20+4Pin
  • Output Current: +5V@11A, +12V x 3@11A, -12V@0.8A, +3.3V@11A, +5V-SB@2.0A
  • Input Voltage: 88 -264 Volts AC
  • Model #: AP-RRP4ATX6508
  • Item #: N82E16817338047
  • Return Policy: Extended Holiday Return Policy
  •  
  • $507.99 
  • Free Shipping
iStarUSA TC-1U30FX8 300W Single 1U Flex ATX 80 Plus High Efficiency Power Supply - OEM
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in 30 days
iStarUSA TC-1U30FX8 300W Single 1U Flex ATX 80 Plus High Efficiency Power Supply - OEM
  • Type: Flex ATX / ATX12V
  • Main Connector: 20+4Pin
  • Output Current: +3.3V@16A, +5V@18A, +12V1@15A, +12V@15A, -12V@0.5A, +5Vsb@3.0A
  • Fans: 1
  • Model #: TC-1U30FX8
  • Item #: N82E16817147101
  • Return Policy: Extended Holiday Return Policy
SuperMicro PWS-1K41F-1R 1400W 1U Server Power Supply 80Plus Gold Front Loaded
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in 30 days
SuperMicro PWS-1K41F-1R 1400W 1U Server Power Supply 80Plus Gold Front Loaded
  • Type: Consumer Electronics
  • Main Connector: 24Pin
  • Output Current: +12V@92/116A, +5VSB@6A
  • Dimensions: 12.83" x 4.09" x 1.57"
  • Model #: PWS-1K41F-1R
  • Return Policy: View Return Policy
Intel 750W Common Redundant Power Supply FXX750PCRPS (Platium-Efficiency)
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Intel
Intel 750W Common Redundant Power Supply FXX750PCRPS (Platium-Efficiency)
  • Dimensions: 5.4" Height x 6.5" Width x 11.8" Depth
  • Weight: 2.5
  • Parts: 3 Year
  • Labor: 3 Year
  • Model #: FXX750PCRPS
  • Return Policy: View Return Policy
Athena Power AP-U2ATX80FEP8 800W Single 2U IPC Server Power Supply - 80PLUS Bronze
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#1 Best Seller
in Server Power Supplies
Athena Power AP-U2ATX80FEP8 800W Single 2U IPC Server Power Supply - 80PLUS Bronze

Limited time offer, ends 12/16

  • Main Connector: 20+4Pin
  • Output: +3.3V@20A, +5V@22A, +12V1@32A, +12V2@32A, -12V@1A, +5VSB@3.5Av
  • Input Voltage: 88 - 264 V
  • Input Frequency Range: 47 - 63 Hz
  • Model #: AP-U2ATX80FEP8
  • Item #: 9SIAZ8XFCU1820
  • Return Policy: View Return Policy
  • $160.90
  •  
  • $145.90 
  • Save: 9%
  • Free Shipping
750W redundant power supply for Dell PowerEdge R720, R720XD, R520, R620, R820, T320, T420 and T620 server.
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DELL
750W redundant power supply for Dell PowerEdge R720, R720XD, R520, R620, R820, T320, T420 and T620 server.
  • Type: Others
  • Parts: 30 DAYS WARRANTY
  • Labor: 30 DAYS WARRANTY
  • Model #: DPS-750AB2A
  • Return Policy: View Return Policy
Athena Power AP-MFATX40P8 400W Single Server Power Supply 80+ Bronze Certified
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Athena Power AP-MFATX40P8 400W Single Server Power Supply 80+ Bronze Certified

Limited time offer, ends 12/16

  • Type: Flex ATX
  • Main Connector: 20+4Pin
  • Output Current: +5V@15A, -5V@0.5A, +12V1@16A, -12V2@16A, -12V@0.8A, +3.3V@15A, +5V-SB@2.5A
  • Input Voltage: 88/264 Volts AC
  • Model #: AP-MFATX40P8
  • Return Policy: View Return Policy
  • $82.06
  •  
  • $72.06 (2 Offers)
  • Save: 12%
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Athena Power AP-RRU2MK1262 62368 Safety & 80 PLUS Certified  2 x 1200W 2U CRPS Modular Redundant Server Power Supply OEM/ODM OK
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Athena Power
Athena Power AP-RRU2MK1262 62368 Safety & 80 PLUS Certified 2 x 1200W 2U CRPS Modular Redundant Server Power Supply OEM/ODM OK

Limited time offer, ends 12/16

  • Type: Redundant
  • Main Connector: 24Pin
  • Output Current: +3.3V@12A, +5V@24A,+12V@80.5A, +5Vsb@5A, -12V@0.3A
  • Output: +3.3V, +5V,+12V, +5Vsb, -12V
  • Model #: AP-RRU2MK1262
  • Item #: 9SIAZ8XF1P4959
  • Return Policy: View Return Policy
  • $999.00
  •  
  • $979.00 
  • Free Shipping
SuperMicro PWS-920P-1R 920W high-efficiency (94%+) power supply with PMBus BULK
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SuperMicro PWS-920P-1R 920W high-efficiency (94%+) power supply with PMBus BULK
  • Type: Consumer Electronics
  • Output Current: +12V@75A, +5VSB@4A
  • Dimensions: 13.58" x 2.99" x 1.58"
  • Parts: 1 year limited
  • Model #: PWS-920P-1R
  • Return Policy: View Return Policy
SuperMicro PWS-1K21P-1R 1200W 1U Server Power Supply 80Plus Gold
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SuperMicro PWS-1K21P-1R 1200W 1U Server Power Supply 80Plus Gold
  • Type: Consumer Electronics
  • Main Connector: 24Pin
  • Output Current: +12V@83/100A, +5VSB@4A
  • Parts: 1 year limited
  • Model #: PWS-1K21P-1R
  • Return Policy: View Return Policy
Dell PowerEdge 9TMRF Y26KX CMPGM PR21C Server Power Supply 1100W
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Athena Power AP-MFATX50P8  500W FlexATX Single Standard Length (150mm) EPS12V/ATX12V mini-ITX/1U IPC/GPU Server Power Supply - 80PLUS Silver Certified  - ActivePFC - OEM
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Athena Power AP-MFATX50P8 500W FlexATX Single Standard Length (150mm) EPS12V/ATX12V mini-ITX/1U IPC/GPU Server Power Supply - 80PLUS Silver Certified - ActivePFC - OEM
  • Type: Flex ATX
  • Main Connector: ATX 24 (20+4) Pin x 1 P4-12V 4+4 Pin x 1 EPS12V 8 Pin x 1 PCIE 6+2 Pin x 2 SATA 15 Pin x 3 Molex 4 Pin x 2 Floppy 4 Pin x 1
  • Output: +3.3V@18A +5V@18A +12V1@20A +12V2@20A -5V@0.5A -12V@0.5A +5V-SB@3.0A
  • Input Voltage: 88 - 264 V
  • Model #: AP-MFATX50P8
  • Item #: N82E16817338120
  • Return Policy: Extended Holiday Return Policy
  •  
  • $136.99 
  • Free Shipping
SuperMicro PWS-1K41P-1R 1400W 1U Server Power Supply 80Plus Gold
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in 30 days
SuperMicro PWS-1K41P-1R 1400W 1U Server Power Supply 80Plus Gold
  • Type: Consumer Electronics
  • Main Connector: 24Pin
  • Output Current: +12V@92/116A, +5VSB@4A
  • Dimensions: 14.17"x 2.99" x 1.57"
  • Model #: PWS-1K41P-1R
  • Return Policy: View Return Policy
Athena Power AP-U1ATX50 500W Single 1U EPS Server Power Supply
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Athena Power AP-U1ATX50 500W Single 1U EPS Server Power Supply
  • Main Connector: 20+4Pin
  • Output Current: +3.3@20A,+5V@20A,+12V1@20A, +12V2@20A, +12V3@16A, -12V@0.5A, +5VSB@3A
  • Input Voltage: 88 - 264 V
  • Input Frequency Range: 47 - 63 Hz
  • Model #: AP-U1ATX50
  • Item #: 9SIAZ8XFDA0297
  • Return Policy: View Return Policy
  •  
  • $138.24 
  • Free Shipping
SuperMicro PWS-711-1R 710W Server Power Supply
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in 30 days
Supermicro
SuperMicro PWS-711-1R 710W Server Power Supply
  • Output Current: +12V@59A, +5V@30A, +3.3V@20A, +5VSB@4A
  • Dimensions: 13.58" x 2.99" x 1.58"
  • Parts: 1 year limited
  • Labor: 3 years limited
  • Model #: PWS-711-1R
  • Return Policy: View Return Policy
Athena Power AP-MFATX30P8 300W Single 80 PLUS Bronze Certified Server Power Supply for 1U Mini-ITX
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Athena Power AP-MFATX30P8 300W Single 80 PLUS Bronze Certified Server Power Supply for 1U Mini-ITX
  • Type: FlexATX
  • Main Connector: 20+4Pin
  • Output Current: +5V@13A, +3.3V@13A, +12V1@9A, +12V2@9A, -12V@0.8A, -5V@0.5A, +5V-SB@2.5A
  • Input Voltage: 88 -264 Volts Ac
  • Model #: AP-MFATX30P8
  • Item #: N82E16817338053
  • Return Policy: Extended Holiday Return Policy
  •  
  • $75.99 
  • $5.99 Shipping
SUPERMICRO Pws-920P-Sq Supermicro 920 Watt Power Supply
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in 30 days
Supermicro
SUPERMICRO Pws-920P-Sq Supermicro 920 Watt Power Supply
  • Input Voltage: +12V@75A, 5V Standby@4A
  • Dimensions: 2.99" x 1.57" x 14.17"
  • Model #: PWS-920P-SQ
  • Item #: 9SIA4A0F3F2284
  • Return Policy: View Return Policy
  • $104.98
  •  
  • $103.02 
  • Free Shipping
SuperMicro PWS-801-1R 800W Server Power Supply
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in 30 days
SuperMicro PWS-801-1R 800W Server Power Supply
  • Type: Consumer Electronics
  • Output Current: +12V@66A, +5VSB@4A
  • Dimensions: 13.58" x 2.99" x 1.58"
  • Parts: 1 year limited
  • Model #: PWS-801-1R
  • Return Policy: View Return Policy
Athena Power AP-MPS3ATX80EP8 800W MicroPS3 (118mm Length)/PS2 Single EPS12V/ATX12V IPC Server Power Supply - 80PLUS Bronze - ActivePFC - OEM
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Athena Power AP-MPS3ATX80EP8 800W MicroPS3 (118mm Length)/PS2 Single EPS12V/ATX12V IPC Server Power Supply - 80PLUS Bronze - ActivePFC - OEM
  • Type: Micro PS3
  • Main Connector: ATX 24 (20+4) Pin x 1 P4-12V 4 Pin x 1 EPS12V 8 Pin x 2 PCIE 6 Pin x 2 PCIE 6+2 Pin x 2 SATA 15 Pin x 8 Molex 4 Pin x 2 Floppy 4 Pin x 1
  • Output: +3.3V@20A +5V@22A +12V1@32A +12V2@32A -5V@N/A -12V@1.0A +5V-SB@3.5A
  • Input Voltage: 88 - 264 V
  • Model #: AP-MPS3ATX80EP8
  • Item #: N82E16817338119
  • Return Policy: Extended Holiday Return Policy
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The primary purpose of a server power supply is converting alternating current (AC) into direct current (DC). The reason is that computers and servers use DC, not AC, which is the type of power that comes from your wall outlet. The power supply is a piece of hardware that powers all the other components of the server with dedicated connectors.

A Redundant Power Supply Prevents Downtime

In a redundant power supply setting, your server works with two or more power supplies. Every PSU can run the server on its own if the other fails. Under normal conditions, each PSU provides half of the power required to operate the server. Most redundant power supplies support hot-swapping, i.e., you can replace the PSU without switching the server off. Hot-swapping prevents downtime, which is particularly important in web servers and mission-critical business environments where you need to keep information and work flowing. While you replace one of the power supplies, the other keeps the server running. It is advisable to install each redundant PSU on a different electrical circuit, so the system will keep working even during a circuit trip or maintenance operations.

Linear vs. Switching Server Power Supplies

When considering power supplies, a linear server and a PC power supply have a more straightforward construction, and require fewer components to convert AC to DC. They tend to be pretty silent, which is an important factor in some work environments. Like server processors, these power supplies work well in systems with efficient cooling. Switching-style power supplies have an internal switch that controls electricity. This leads to less energy consumption. In comparison with a linear PSU, a switching one tends to have smaller components. However, it also produces more noise. 

Certifications Determine the Energy Efficiency of Your Server Power Supply

80 PLUS® is a voluntary certification program that classifies server and PC power supplies, including power strips, by their energy efficiency. You can obtain the energy efficiency value by dividing the amount of power the PSU provides by the amount of energy it draws from the power outlet. 80 PLUS Titanium PSUs are the most efficient, as they offer 92% energy efficiency at 20% load, 94% efficiency at 50% load and 90% efficiency at 100% load. 80 PLUS Platinum power supplies offer 90% efficiency at 20% load, 92% efficiency at 50% load and 89% efficiency at 100% load. 80 PLUS Gold PC power supplies provide 87% efficiency at 20% load, 90% efficiency at 50% load and 87% efficiency at 100% load. There are other 80 PLUS certifications with inferior efficiency requirements, but they are less common in server PSUs. 

Server PSUs Come With Different Connector Types

Server power supplies come with different types of main ATX connectors. The most common connector in older motherboards is the 20-pin one. Most modern motherboards, instead, feature the 24-pin connector. You can also find PSUs with a 20+4 connector, which works with any motherboard, whether it has the 20-pin or 24-pin connector.