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M4a785td-v Evo + AMD II X4 620 Instability

Last response: in Motherboards
September 5, 2010 1:19:41 PM

Good morning people!

I'm new here and of course "I have a problem"...
The thing is my M4a785td-v Evo is randomly crashing and as I can't figure it out maybe you guys could.

Before anything, here is the configuration:
Asus M4a785td-v Evo - MOTHERBOARD
AMD Athlon II X4 620 (@stock) - PROCESSOR
2x 2GB Corsair XMS3 DDR3 @1600MHz (stock) (model TR3X6G1600C9) - RAM
Seagate 7200.12 Barracuda 1TB Sata II 32mb buffer - HD
XFX AMD (aka ATI) Radeon HD 4670 1GB/128bits - VGA
Windows 7 Home Premium x64 (genuine) - OS
Seventeam ST-550BAZ - POWER SUPPLY

There is no pattern between the crashes and I already tried/tested the following (and had no sucess at all):
-Swap the power supply to ST-850ZAF (which perfectly worked in other PC);
-Change house (tested in another house in a very good location which has a great AC stability);
-Format and install (again) Windows 7 (both x64 and x86);
-Tryed Ubuntu 10.04.1 direcly from USB2.0 flashdrive;
-Tested memory with memtest86+ (9 times sucessful full test);
-3Dmark Vantage (twice with all tests selected);

So now I can just think it's motherboard fault because processors are really hard to fail, right?
After all tests, the computer was running (and crashing/reestarting) about 18 hours and the room was a little hot and the crashes started to happen oftenly.
Considering when one crash happens I reestart and it crashes again, and again and again; it seems obvious: TEMPERATURE.
In the BIOS I get 55~58ºC for the CPU and 45ºC~47ºC for the Motherboard.
Ambient temperature: 17ºC.

So people, are these numbers ok? Am I missing something (a test or a detail)?

Note I get no BSOD or any system message, It just crashes or restart (it mostly crashes).

Thanks in advance,
a b Ĉ ASUS
a c 234 V Motherboard
September 5, 2010 2:30:30 PM

I would verify your heat sink is firmly seated and I would recommend removing, cleaning off the thermal compound, reapply and reattach the heat sink. It seems like a heat related concerns based on your information.
September 5, 2010 5:59:45 PM

I still have its warranty, if I remove the heat sink will I lose that?
Related resources
a b Ĉ ASUS
a c 234 V Motherboard
September 5, 2010 6:07:53 PM

No... Removing and reinstalling the heat sink has no effect on the warranty. You'll be fine doing so.
September 15, 2010 12:05:21 AM

Thank you all!
As the board has less than 1 year I decided to RMA it.

When I receive the new board, test it and find out that the issue really was the motherboard I post here.