i5 760 with v28.9

[majk]

Hello all prime95 users,

I decided to make my first post on forum. I begun using prime95 after 2000s on my different computers with cpu like sempron, c2d and i5 760.
Computer I am still using is i5 760 with Asus P7P55D-E MB. I tuned this pc last in 2011. For my curiosity I tried some weeks ago last Prime95 v28.9. .
I tried to run blend test with V28.9 and I still get random crashes (windows error Prime95 has encoureted error, or rounding errors), sometimes in 30 mins,
sometimes in 8 hours or in 16 hours. I am amazed, because if I used 26.6 version computer is able to run it for 24 even 48 hours without error.
I tried also use custom test FFT size 8 - 4096 kB and 4GB ram without any problem in 26.6. I used the computer overclocked 16x21 from the beginning. But errors
in 28.9 are comming even on stock settings.
I also used to try Memtest86 for 24 hours without error for RAM (2x4 GB Crucial Balistics sport)

I would like to ask you if there could be some practical explanation for it.

Thank you

With best regards

majk

[GP2]

Originally Posted by majk

For my curiosity I tried some weeks ago last Prime95 v28.9. .
I tried to run blend test with V28.9 and I still get random crashes (windows error Prime95 has encoureted error, or rounding errors), sometimes in 30 mins,
sometimes in 8 hours or in 16 hours. I am amazed, because if I used 26.6 version computer is able to run it for 24 even 48 hours without error.

A lot of optimizations were made since version 26.6, for instance using AVX. Also, version 28.9 does threading in a different way, using multiple cores in parallel on a single exponent.

So perhaps it's triggering a pre-existing issue that was not triggered by the previous versions or by Memtest.

[paulunderwood]

Install some temperature monitoring software.

Clean out the dust from your computer, especially around the heatsink and its fan.

If the temperature is still a problem, you may need to re-seat your heatsink onto the chip with some new paste.

Check that your PSU is giving acceptable voltages -- see in BIOS.

[pepi37]

Originally Posted by GP2

A lot of optimizations were made since version 26.6, for instance using AVX. Also, version 28.9 does threading in a different way, using multiple cores in parallel on a single exponent.

So perhaps it's triggering a pre-existing issue that was not triggered by the previous versions or by Memtest.

I5 760 doesnot have AVX instruction set.

[majk]

Hello all,
I do not have and never had problems with this computer. I run Prime v28.9 only coincidentally since it was very long time when I used Prime last. When I run v28.9 temps were according to HWmonitor info: temp over cores 55-57°C, with overall CPU temp 61°C max and thats all with ambiemt temperature 27 - 28°C in room.
I begin to lean to conclusion by user GP2 that it triggers something what was not triggered before. Maybe.
At the end of this post I must say big thanks to all participating users. I really enjoy specialized forums like this.

Regards

majk

[paulunderwood]

If it is not temperature that is the problem, there are a few things you might try out:

Flash the latest BIOS.

Check PSU voltages.

Overvolt the CPU by a very tiny amount.

Ditto the RAM.

[lycorn]

i5-750 here.
Installed in 2010, has gone through several Prime95 versions from 25.x to 28.5, presently.
Never had any problem with this setup, except for some faulty RAM replaced a couple of years ago.

@OP,
I don´t think your problems are related to the version of Prime95 you´re currently running. As the temps are within spec, make sure the RAM is OK. If I were you, I would also check the sanity and stability of the power supply. If it´s still the original one, it may be retiring time, who knows?

[majk]

I will check voltage under load of the power supply, which is actually Enermax Liberty 500W. Good PSU in its days, maybe is weaker, over seven years old.

[Denver]

My i5 is slow as hell now. Time for an i7 I think.