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The Extreme Power Plus RS-550-PCAR-E3 pushes out 550W of power to handle your system's thirst for juice and supports dual +12V1 and +12V2 outputs for higher power usage. It provides over 70% efficiency at typical load operation. With a life-time of 100,000 hours and protections for OVP/UVP/OTP/OPP/SCP, this power unit is made to last.
Pros: There's something to be said about the build quality of Cooler Master power supplies. Fresh out of the box they look great, they have large fans and are relatively compact. Every single PSU from Cooler Master, including this PSU, has had stable 5v and 12v rails across a very long lifespan. I always find it dangerous to purchase Power Supplies from off-brand manufacturers so it's nice to see a 500w PSU from Cooler Master that's under $40.
Cons: It's unusual to see Cooler Master PSUs with short 24-pin and 8-pin CPU cables. roughly 90% of Cooler Master's case lineup have bottom mounted PSUs, and I had a lot of trouble getting these two cables to reach where I wanted to on an ATX motherboard when using a bottom mounted case. I was very lucky to have been using a very short, inexpensive graphics card because I could plug in the 24-Pin with less than 1/2 in. of slack. You should be fine on a Micro ATX motherboard, but for full ATX you should plan to use extension cables. I still don't understand why power supplies come with two SATA connectors and a Molex connector on the same run of cable. I would much rather see this PSU ship with SATA and 4-Pin Molex on separate runs of cable like the higher end modular PSUs. This PSU is also now the loudest device in my HTPC. The PSU fan tends to run at full speed all the time, which seems unusual, but it may be because PWM fans on PSUs aren't available at this price range.
Overall Review: I'd like to see more lower wattage PSUs ship with sleeving and modular cables, but for the cost I understand why they don't. I just like cleaner cabling in my cases. Just because I have a larger Cons section than Pro section doesn't mean this is a bad review, it's far from, I just had to explain my problems with this power supply. This is an absolutely fantastic power supply for the cost, and it's well worth the purchase. I had purchased this PSU to replace an older Antec Quattro that was making way too much noise in my HTPC case. This PSU is significantly quieter, even though it's the loudest thing in the case. With a few fixes to the cabling this would have been a 5-star review.