Prime95 fail - what does it mean?

subbytna · 7 Jan 2011 at 18:07

I've ran a stress test using PRIME95 and I got this image...can someone tell me what it means, I've just installed a fan on my CPU cooler and I was running prime95 to test temps....

subbytna · 7 Jan 2011 at 18:08

if it has failed because of the overclock - would more voltage fix it?

or

I'm messing about with 333 rated DDR2 (1066 on order)- is this the cause of the overclock fail?

Speed · 7 Jan 2011 at 18:12

It might do yes, assuming the problem isn't related to something else like memory. What type of Prime95 test did you use?

setter · 7 Jan 2011 at 18:12

What clockspeed were you running, vcore, multiplier etc, post up an image of cpuz.

subbytna · 7 Jan 2011 at 18:13

I tried the

"Inplace large FFTs" test

subbytna · 7 Jan 2011 at 18:17

Speed · 7 Jan 2011 at 18:19

Try upping the vCore by one increment and retest.

subbytna · 7 Jan 2011 at 18:21

oooh right do you mean from 1.248 up to 1.348? what size of increment in teh vcore should I do?

Speed · 7 Jan 2011 at 18:23

Just one step up from what it is now, what ever size increment the motherboard uses.

The basic idea is to up it slowly until it is stable, you want to use the smallest amount vCore you can as it reduces temps.

Sleeve · 7 Jan 2011 at 18:53

9 times out of 10 in my experience (Be it short) and from what i've read, rounding errors are caused by voltages being too low.

Experiment with Vcore and RAM voltages.

subbytna · 7 Jan 2011 at 19:10

ok Prime running on 1.3 for vcore....how long should I leave Prime running to make sure it's stable?

setter · 7 Jan 2011 at 19:11

Have you touched the other voltages, ie pll, nb and fsb-term?

EDIT: Just noticed that your chip is a C1 stepping, generally theese require a bit more vcore for a given clockspeed compared to an EO stepping chip.

subbytna · 7 Jan 2011 at 19:22

yeah the c1's need a fair bit of juice to keep up

didn't touch anything else, just increased the vcore.

I'm not going to touch RAM settings as I'm awaiting on my new RAM so this is just a mess about for my first proper OC tinkering

subbytna · 7 Jan 2011 at 19:49

temps went to 74 on 2 of the cores so given that the thermal limit on these chips is 71 or so...I've had to knock the vcore down to 1.28....see how prime likes that

bifday2k · 7 Jan 2011 at 20:34

That thermal limit, is'nt for the cores, its for the overal cpu temp..

The cores can go a lot higher then that.

mmj_uk · 7 Jan 2011 at 20:44

It looks quite hot I'm not sure the old Core 2 Quads could run stably at 65C, maybe drop your overclock a little?

setter · 7 Jan 2011 at 20:49

65c+ is fine on a q6600, but unfortunately the C1 stepping q9550's will run a bit warmer than their EO counterparts, due to the fact that they need a lot more voltage, iirc my own EO q9550 ran at 54c on the highest core at 3.8ghz, albeit it was a 1.200 vid chip that needed only 1.216 vcore at 3.8ghz.

El Jimben · 8 Jan 2011 at 11:53

I haven't really tried clocking my C1 Q9550 but mine has the same VID as yours and I can tell you that it's very unlikely you'll be able to hit 3.8GHz at such a low vcore.

jamesfreddie · 16 Jan 2011 at 15:27

Leave it for 9-14 Hours

jamesfreddie · 16 Jan 2011 at 15:28

What voltage are you now using