CPU, SERIOUS: Incorrect 128bit (SIMD-SSE) floating point addition

[Dodiesis94]

Hi,

I recently had various issues on my pc, so I decided to use BurnInTest to check if one component has to be replaced.

SERIOUS ERROR SUMMARY FOR THE LAST TEST RUN
*******************************************
SERIOUS: 2020-07-26 19:22:57, CPU, SERIOUS: Incorrect 128bit (SIMD-SSE) floating point addition (x 1102)
SERIOUS: 2020-07-26 19:23:01, CPU, SERIOUS: SSE operation verification failed (x 90)

The problem is that I don't know which component should I replace, if the CPU or the motherboard ... I'd rather avoid buying another CPU just for testing purpose.

I ran the tests with log trace level 1. If they can be useful, I would gladly share the logs but I just can't figure out a way to do that

Thanks
Simone

[David (PassMark)]

So the CPU did some floating point maths and got the wrong answer.

Something like.
1.5 + 1.5 = 4.1.

So this can be due to bad RAM or a bad CPU.
I'd try using MemTest86 next to see if the RAM is bad.

[Dodiesis94]

Thank you kindly for your fast reply.
I ran MemTest86 and the results were good, even though it faced some visual oddities (only during some "hammer tests").
I made some photoes of those oddities, maybe they are typical for this kind of test, can't tell ...
So could it be the CPU ? Is there a chance that it's the motherboard instead?

Simone

[Dodiesis94]

I don't understand ... today to try something different I replaced my graphic card with an older one, ran again BurnInTest on CPU and no error showed up
Any guess?

[David (PassMark)]

No, strange visual artefacts are not normal during MemTest86.

Having a bad video card cause visual artefacts is fairly common.
But having a bad video card cause CPU errors isn't common at all.
Is the power supply adequate for the machine?

[Dodiesis94]

I thought it was, maybe it's not ... It's the only reasonable explanation in fact.
My mobo has 2 8-pins power connectors, but since the PSU has got only one of them and theorically the second one is not mandatory, I thought it would have worked. It did for two weeks, then some issues showed up. With hindsight, for a 12-cores CPU the second power connector should be mandatory.
I'll have to replace the PSU I guess, It could have been worse.

Thanks again, you have been really helpful, and so are these PassMark products.

Simone