M4a785td-v Evo + AMD II X4 620 Instability

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,
Leonardo.
4 answers Last reply
More about m4a785td instability
  1. 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.
  2. I still have its warranty, if I remove the heat sink will I lose that?
  3. No... Removing and reinstalling the heat sink has no effect on the warranty. You'll be fine doing so.
  4. 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.
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