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Item#: N82E16813131331

ASUS M3A78-T AM2+/AM2 AMD 790GX HDMI ATX AMD Motherboard

  • AMD 790GX
  • Phenom FX / Phenom / Athlon 64 FX / Athlon 64 X2
  • DDR2 1066
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Learn more about the ASUS M3A78-T



Supported CPU

CPU Socket Type
CPU Type
Phenom FX / Phenom / Athlon 64 FX / Athlon 64 X2
2600MHz Hyper Transport (5200 MT/s)


South Bridge


Number of Memory Slots
Memory Standard
DDR2 1066
Maximum Memory Supported
Channel Supported
Dual Channel

Expansion Slots

PCI Express 2.0 x16
3 x PCI Express 2.0 x16
(Dual x8 or Dual x16/x4; Triple x8/x4/x8)
PCI Express x1
PCI Slots

Storage Devices

1 x ATA100 2 Dev. Max
SATA 3Gb/s

Onboard Video

Onboard Video Chipset
ATI Radeon HD 3300

Onboard Audio

Audio Chipset
Realtek ALC1200
Audio Channels
8 Channels

Onboard LAN

Max LAN Speed

Rear Panel Ports

Video Ports
D-Sub + DVI
1 x HDMI
USB 1.1/2.0
4 x USB 2.0
IEEE 1394
1 x IEEE 1394a
1 x eSATA 3Gb/s
1 x Optical
Audio Ports
6 Ports

Physical Spec

Form Factor
12.0" x 9.6"
Power Pin
24 Pin


140W CPU Support
DDR3 1333 SidePort Memory Boost for IGP
AMD Hybrid CrossFireX Support
Quad-CrossFire Support


Package Contents
Driver Disk
User Manual
Rear I/O Panel Shield
FDD Cable
SATA Cable
4-pin to SATA Power Cable

Manufacturer Warranty

3 years limited
3 years limited

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the ASUS M3A78-T

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  • Joshua M.
  • 8/16/2012 8:29:28 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

2 out of 5 eggsFan slots all died at once

Pros: Asus brand products have always been good to me in the past. I've built several computers throughout the years and have always went towards ASUS for their motherboards.

Cons: Right after the 3 year mark hit, the CPU Fan, PR Fan, and CH Fan2 slots all died on me. After all the years I've given towards praising ASUS for their wonderful work and I get one that completely turns me against the brand. I would have understood if one slot died on me, but when 3 turns out dead at one go is just ridiculous. I'm not sure if I'll be buying anymore ASUS products in the future. I couldn't get any help or information from their support line. A once satisfied but now unsatisfied customer.

Did you find this review helpful? Yes No

  • Gary L.
  • 6/15/2012 4:58:34 AM
  • Tech Level: Average
  • Ownership: more than 1 year
  • Verified Owner

1 out of 5 eggslast ASUS product I will buy

Pros: worked for about 2.5 years

Cons: ASUS support.
the board failed in late 2011
Sent it in under warranty. Asus replied they wouldn't look at it because the board was warped. It wasn't warped when I sent it. Even though it was under warranty, they wouldn't look at it because it was warped, unless I paid them ($98). So, I paid them.
Eventually, they sent me a board. The board received was warped. Sitting it on a flat surface showed one corner lifted nearly a half inch. Why send back a board they wouldn't do anything with (unless paid) with the same issue (after being paid).
Never received documentation about what was wrong/fixed.
Thought I would try to install it anyway and saw they removed the CPU/Fan retention bracket that was a stock part of the board. Their product doc and photos show it on the board and it ships installed on the board and not listed as an accessory, but they removed it anyway, so can't use it unless I buy a bracket. When I called support, the "manager" I talked to was rude and condescen

Other Thoughts: rating given is primarily due to their support experience.
bottom line, after this support experience, I'm done purchasing ASUS products. I'm a tech support engineer myself and understand the challenges of the role and working with customers. The front line engineer was nice and I understand what he could do about the situation is limited. The "floor manager" or whatever they call the supervisor for the shift, was very rude and condescending, claiming it was a $3 part and I need to just go buy one. He had no answer for why I received a warped board after paying the $98 fee to RMA the board.
So, after this support experience, I'm done with asus. No more boards, tablets, laptops, etc., nor will I recommend them because why would I want a friend or colleague to have to chance going through their support channel.

Manufacturer Response:

Dear Valued Customer,

We apologize for the issue you had with the motherboard and with our customer service experience.

Please allow me to look into this for you by emailing me a case # or RMA #. The retention bracket is part of the motherboard and should be included in the replacement. My email is reference #C1037-2966. Please also include pictures of the warped motherboard so that we can verify its condition.

Asus Customer Loyalty

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  • James H.
  • 11/30/2011 9:28:53 PM
  • Tech Level: High
  • Ownership: more than 1 year

1 out of 5 eggsFlaky board

Pros: It was decently priced. It has "lasted" almost 3 years.

Cons: Can't handle mixed IDE and Sata drives. It doesn't recognize the Sata if IDE drives are attached.
Audio jack out lost the right channel after 2 years.
USB controller went offline at the almost 3 year mark.

Other Thoughts: Not worth it. Asus has treated me well up until this motherboard.

Did you find this review helpful? Yes No

  • Ryan W.
  • 3/3/2011 6:32:28 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

3 out of 5 eggsAsus support is abysmal.

Pros: The board layout is adequate, and was feature rich at the time. I had it for a while and it worked fine. I'm giving this more eggs than I probably should just because I was mostly happy with it for at least a while.

Cons: The board died and refused to POST, seems to fail to recognize any CPU (at least that's why I think it won't POST). I RMA'd it to Asus, who returned it without doing anything. When I called back, my call was allegedly esclated, which basically means leaving me on hold until I gave up. I was on hold for over an hour.

Other Thoughts: I never got it to work with an AM3 processor, which I bought when it first stopped POSTing because I suspected my processor was at fault. I later tested my processor in another system and it turns out it was fine. Asus' warranty support system is hideous and I will not be buying another Asus product knowing this. They not only did not repair my board after I sent it to them at my own cost, but they won't replace it knowing that it still doesn't work and won't pay for me to ship it back to them again. It's still under warranty, yet I do not have a working board. Why is this, Asus?

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  • Gregory W.
  • 5/28/2009 1:48:41 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year

1 out of 5 eggsThink Twice...or Three TImes

Pros: Great board layout. Incremental upgrade options. EZ-Flash BIOS.

Cons: I've been building workstations and enthusiast machines for 15 years and this is quite possibly one of the worst boards I have ever encountered. It is beyond flaky with RAM (*regardless* of brand or speed). And it has an almost impossible time with 4 hard drives. (In my case, two of which are WDs and two of which are Seagates.) Every BIOS update is worse than the last, with the exception of the 7-series to the 8-series. I haven't been able to shut the machine down since I got it, because it magically loses *at least* one hard drive after a power off. Appalling quality. Appalling product.

Other Thoughts: Don't waste your money. I would encourage anyone and everyone to stay away. It just isn't worth the hassle. Get a different board and a low-price video card. The sheer amount of stress and loss of productivity is simply unacceptable. ASUS used to make quality products that you would pay a premium for. I'm not sure what happened, because this is one of the most substandard products I have ever had the displeasure of working with.

Phenom II 940
4GB OCZ RAM (among other brands here in the shop, Corsair, Crucial, it doesn't matter.)
2x WD 500AAKS
2x Seagate 7200.10 320GB

Run for the hills.

Manufacturer Response:

Dear Valued Customer,

We are sorry for this inconvenience. Please contact our Technical Support Department at and reference case number "NE377530" so that we may get more details about your system configuration and assist you in resolving these issues you are experiencing.

Best Regards,

ASUS Support Team

1 out of 5 people found this review helpful. Did you? Yes No

  • Joseph M.
  • 5/27/2009 1:49:08 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsbuyer beware!! do your research

Pros: very happy with's quick shipping and service. will definitely shop newegg again. saved money on many items purchased versus shopping at other online computer parts stores. A+++

Cons: as stated in the title, buyer beware and do your reasearch on the ASUS motherboard forum. after installing mobo, proc, ram, and vid cards, mobo would not POST. tried all troubleshooting suggestions offered on the forum, took mobo out and RMA-ed it to ASUS. board gone for like 2 weeks, got it back, reinstalled board, proc and ram and having same issue. many other members on forum also have problems getting this board to POST, some have RMA-ed their board too and with same result. will try sending it back to ASUS to get a refund. if that doesn't work, i guess i just bought a $138 hi-tech rectangular frisbee. going to buy a different board from different manufacturer. VERY disappointed with the whole experience, will not take a chance on ASUS again.

Other Thoughts: couldn't give a "no egg" rating for this. if i could have, i would have. again, VERY DISAPPOINTED with product.

Manufacturer Response:

Dear Valued Customer,

We would like to assist you in resolving your issues. Please contact us at and reference case number NE375982 for assistance in resolving your issues.

Best Regards,

ASUS Support Team

1 out of 4 people found this review helpful. Did you? Yes No

  • Patrick K.
  • 5/26/2009 1:06:55 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggs3 month wait to see how it turned out and....

Pros: Very nice board and very capable. Crossfire works nice, supports Phenom II's and DDR2 1066 with no down clocking issues like some boards have been having. Very affordable for the performance you get. Integrated HD 3300 works well too.

Cons: Chipset does get a little warmer than the average board but then again I'm picky when it comes to heat. I did think it was weird that they are using the adjacent RAM slots together rather than alternating like my previous 2 boards but not that big of a deal

Other Thoughts: I've worked with 3 of these boards in the last 3 months and so far, none of them have had ANY issues. One of which I setup a RAID array and it was easy, though a little time consuming. The biggest surprise on this board was the integrated HD 3300. It's actually pretty good. I wouldn't recommend it for gaming or anything but no doubt the average person just checking e-mail and searching the web would be more than satisfied and as soon as the day comes that they're not, you know it's easy to upgrade.

3 out of 3 people found this review helpful. Did you? Yes No

  • Ryan B.
  • 5/20/2009 2:29:06 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat Board

Pros: -Excellent Value
-Great Dependability
-Good Over Clocking

I didnt have any other issues mentioned by others, I used a discrete vid card too.

Cons: None, works great. This is my 3rd Asus board. They all work great!

Other Thoughts: Build Specs
-Asus Mobo
-AMD 64 X2 7750 oc to 3.1 ghz
-Sapphire ATI HD 3870 in Crossfire
-G. Skill 4 GB DDR2 800 Mhz
-WD 500 GB HDD
-Thermaltake V9 Black case

1 out of 2 people found this review helpful. Did you? Yes No

  • Ryan K.
  • 5/13/2009 6:18:39 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

3 out of 5 eggsFirst time disappointment with ASUS

Pros: The parts that work are stable and overall I have had a good experience with ASUS boards.

Cons: HDMI out has never worked with my HD TV whether I use ASUS' drivers or AMD's. Ended up spending $180 on an NVIDIA card which works perfectly. I have owned this motherboard for about 6 months and the built-in NIC has already died.

Other Thoughts: I am going ahead and giving this three stars because I probably just got a bad board. I have been purchasing nothing but ASUS for years and have never had anything die on my other ASUS motherboards.

Manufacturer Response:

Dear Valued Customer,

We are sorry for this inconvenience. Please let us know if we can assist in the RMA process by contacting us at and reference case number "NE365161".

Best Regards,

ASUS Support Team

0 out of 1 people found this review helpful. Did you? Yes No

  • Ryan J.
  • 5/5/2009 3:20:26 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsAlmost, but not quite

Pros: This thing has alot of good features. The onboard HDMI out is great and it has plenty of expansion slots. All around, this is a great buy.

Cons: The only issue I have with it was before I had my video card, I was using onboard video. I had my tv hooked up to it via the HDMI port. For some reason, when I run both audio and the display through the HDMI, I would get this groovy snow effect on my screen just out of nowhere. I know it wasn't the HDMI cable or my tv because my cousin used the same input slot on the tv and the same cable for his Xbox when he was visiting a few weeks ago. I havn't been able to figure this one out.

Other Thoughts: Besided the audio problem (when using seperate speakers or headphones the audio is fine) this motherboard is a great buy and I would recomend it to anyone.

Did you find this review helpful? Yes No

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Item#: N82E16813131331
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