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Defective CPU or RAM

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Hi,
I have a new setup,
AMD Phenom ll 550 be
2048x2 PC8500/1066 OCZ Platinum
GA-MA790GP-U4DH
OCZ StealthExtreme PSU 500w
3 HDD

I just returned a GA-MA790GP-U4DH -- IGP not working- DOA.
Received the second one.
I have trouble booting takes 2-4 times before IGP starts.
Got to shutdown via PSU.
Start to think the problem is not the mobo.

I test Memory with memtest86+
1 test: 2x2048 memtest86+ crash at the end of 4 test/13min
2 test: 1x2048 memory = Ok No errors
3 test: other memory = Ok No errors

Now tested with Prime95.
Crashes 5min into test.
[Sun Jul 19 14:13:50 2009]
M5 is prime! Wd1: 000A000A,00000000
FATAL ERROR: Rounding was 0.5, expected less than 0.4
Hardware failure detected, consult stress.txt file.
[Sun Jul 19 14:50:49 2009]
M5 is prime! Wd1: 000A000A,00000000

Cant find wich component is defective.
Anyone had similar problems?
Desperatly need help...
Thx in advance,

More about : defective cpu ram

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CPUs Expert

Try it again with the side of the case taken off, and if you can blow a fan onto the components at the same time, just to see if you have a bad airflow.

It is outside the case,
Never even made it in yet!
There is 2x120mm blowing on the cpu and chipset.
Temps both around 34-36degrees.
I bought this pc 3 weeks ago and got 1 mobo DOA and now a second one...
Video always crash, cant even game 5min. "ATI HD3300 onboard"
Going nuts!
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CPUs Expert

It's possible if unlikely that you just got another bad mobo. Just try to narrow down the problem as much as you can, ie try with only 1 stick of memory next. All 3 crashes you mentioned are possible due to faulty RAM whereas only 2 are likely due to a faulty graphics chip.

Before all these steps, ensure that you have proper BIOS settings and RAM timings/voltages are at factory settings.

First, test EACH RAM module separately. This ensures each stick is in good condition.

Second, test a PERFECTLY good running stick in each memory slot; this ensures each slot is in working order.

Thirdly, test the stick in pairs. If the last two previous steps work just fine, then judging by your first post, you have a bad memory slot or your MB cannot run in Dual Channel.

Next, make sure you have the latest version of Prime95 that can run multiple instances on multi-core CPUs

Then run the Small FFT test; it ONLY tests the CPU FPU; if you get errors, most likely the CPU is faulty.

Good luck.

EDIT: Test with Memtest86, unless that memory diag tool can run for 12 hours+

I test Memory with memtest86+
1 test: 2x2048 memtest86+ crash at the end of 4 test/13min
2 test: 1x2048 memory = Ok No errors
3 test: other memory = Ok No errors
Tested 2x 2048 with Memory Diag tool:
No errors found.

Now tested with Prime95.
Crashes 5min into test.
[Sun Jul 19 14:13:50 2009]
M5 is prime! Wd1: 000A000A,00000000
FATAL ERROR: Rounding was 0.5, expected less than 0.4
Hardware failure detected, consult stress.txt file.
[Sun Jul 19 14:50:49 2009]
M5 is prime! Wd1: 000A000A,00000000

Bios F1 "Stock"
Memory as timing a little loose but factory config. Running Dual- 1066mhz - 5-7-7-20, 2.20v
CPU: Phenom ll x4 B50 @ 3106mhz 1.3v

Could be the CPU?
Always crash to when testing.
I dont know what to do next.
Bought this kit over the net so RMA are a pain...
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