Prime95 users, a question. - Techist - Tech Forum

Go Back   Techist - Tech Forum > Computer Hardware > Overclocking and Modding
Click Here to Login
Closed Thread
 
Thread Tools Display Modes
 
Old 08-15-2008, 12:16 AM   #1 (permalink)
True Techie
 
Join Date: Aug 2008
Posts: 172
Default Prime95 users, a question.

Do you guys always use Small FFTs when using the program to test your CPU temps and stability? I find the temp difference between Large and Small FFTs to be quite large, so I was wondering what the majority of you guys use. Thanks.
__________________

Squirtis is offline  
Old 08-15-2008, 09:59 AM   #2 (permalink)
disgruntled ex-moderator
 
Nagasama's Avatar
 
Join Date: Oct 2006
Location: probably on the lake
Posts: 6,956
Default Re: Prime95 users, a question.

small ffts to test cpu stability.
large ffts to test temperature.
blend coupled with 3-4 passes of memtest to test overall stability and ram.

IMO, all of these need to run at least 8-10 hours. some say less, some say more.
__________________

__________________
"nagasama no longer drinks tecate, or streaks out of the night for anything, and he has a fine wife so he has no use for your girlfriend...she is safe..."
Nagasama is offline  
Old 08-15-2008, 12:06 PM   #3 (permalink)
True Techie
 
Join Date: Aug 2008
Posts: 172
Default Re: Prime95 users, a question.

wouldn't small FFTs test temps then? since it gets hotter?
Squirtis is offline  
Old 08-15-2008, 12:39 PM   #4 (permalink)
disgruntled ex-moderator
 
Nagasama's Avatar
 
Join Date: Oct 2006
Location: probably on the lake
Posts: 6,956
Default Re: Prime95 users, a question.

that depends on your cooling solution.
small ffts heat up more because it is using the cache much more.
if you have an air cooling set up, small ffts would test that solution more than large ffts.
if you have water, small ffts are not a stressful test at all. i guess i should have asked before i made my post.
and yes, i made a mistake in my post, large fft will stress the cpu much more than small (i always get them backwards like left and right lol).
so, small ffts for heat and cooling testing.
large for cpu stability and power consumption.
blend for overall stability.
BTW, i have found that if an overclock passes small fft and fails large fft, it is usually a NB/memory dimm voltage issue, not a cpu voltage issue.
sorry for the confusion.
__________________
"nagasama no longer drinks tecate, or streaks out of the night for anything, and he has a fine wife so he has no use for your girlfriend...she is safe..."
Nagasama is offline  
Old 08-15-2008, 02:25 PM   #5 (permalink)
True Techie
 
Join Date: Aug 2008
Posts: 172
Default Re: Prime95 users, a question.

thanks for your answers and knowledge, now my next question.

If my CPU temps reach above 60C in Small FFTs but stay around 50C in Large FFTs, should I be scaling back my OC because of temp issues? or should I base my CPU temp/stability judgment upon the Large FFTs.

As of right now Large brings my cores to around 50-53C and Small brings me to 60C after an hour testing. I OCed my Q6600 to 3.2 GHz.
Squirtis is offline  
Old 08-15-2008, 02:28 PM   #6 (permalink)
disgruntled ex-moderator
 
Nagasama's Avatar
 
Join Date: Oct 2006
Location: probably on the lake
Posts: 6,956
Default Re: Prime95 users, a question.

no, 60* is not a problem AT ALL for that cpu.
let it run for several hours and see how hot it gets. it should be at the upper limit by about 1-2 hours or so. use coretemp, it records minumum and maximum temps in its control panel.
what are your idle temps? what cooler are you using? what is your cpu core voltage?
__________________
"nagasama no longer drinks tecate, or streaks out of the night for anything, and he has a fine wife so he has no use for your girlfriend...she is safe..."
Nagasama is offline  
Old 08-15-2008, 02:41 PM   #7 (permalink)
True Techie
 
Join Date: Aug 2008
Posts: 172
Default Re: Prime95 users, a question.

well i'm not at home right now, but off the top of my head. My idle temps are around 30-35C, my heatsink is a Thermaltake Big Typhoon with AS5...1 week into priming the paste, in an Antec 900.

My voltage is all wonky. The default was pretty high at 1.3250, but CPUZ only read 1.300. I OCed to 2.8 and put the voltage to 1.350. Last night i pushed my OC further to 3.2 GHz and moved my voltage up in the BIOS, to 1.40, but CPUZ still only reads 1.325, about. It's weird cuz CPUZ is reading around the same voltage, but when i OCed to 3.2 GHz and didn't increase the voltage in the BIOS it was unstable and i got a BSOD. What's up with the BIOS voltage and the actual reading? Is there a way to minimize this disparity?

thanks for the help, this message board has proved invaluable to me.
Squirtis is offline  
Old 08-15-2008, 04:59 PM   #8 (permalink)
I feel funny...
 
thirdshiftdj's Avatar
 
Join Date: Oct 2006
Location: Lowell,Ma
Posts: 3,808
Send a message via AIM to thirdshiftdj
Default Re: Prime95 users, a question.

vdroop. Some boards have it worse than others. Some boards will also have features to help
__________________
NUFFIN!
thirdshiftdj is offline  
Old 08-15-2008, 05:06 PM   #9 (permalink)
True Techie
 
Join Date: Aug 2008
Posts: 172
Default Re: Prime95 users, a question.

yea i've noticed some you have that feature when you post your BIOS pics. Mine, the eVGA 680i, does not. Is there any other way to remedy the problem? Is it even a problem? Should I only worry about the actual voltage output that CPUZ reads?
Squirtis is offline  
Old 08-15-2008, 05:09 PM   #10 (permalink)
I feel funny...
 
thirdshiftdj's Avatar
 
Join Date: Oct 2006
Location: Lowell,Ma
Posts: 3,808
Send a message via AIM to thirdshiftdj
Default Re: Prime95 users, a question.

just compensate if you need to
__________________

__________________
NUFFIN!
thirdshiftdj is offline  
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mac users urged to ditch Safari Osiris Apple and Mac 8 08-06-2008 07:23 PM
Ubuntu Hardy Heron - VLC + Amarok users. Tune in. Question. Jayce Linux and Open Source 2 07-18-2008 09:49 PM
prime95 question bkolk Overclocking and Modding 8 01-23-2008 09:51 PM
Prime95 Question qk232 Overclocking and Modding 2 01-09-2008 08:22 PM
Question for all steam users krazyq PC Gaming 5 09-24-2007 05:50 PM



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 06:44 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.