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Old 2014-07-30, 22:47   #1
scrawlings
 
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Question Small FFTs immediately crashes my computer, help please!

Why am I able to run both the “blend” and “in-place large FFTs” tests for 6 hours while the “small FFTs” test crashes my computer within 5 seconds each and every time I run it?


Specifications of system (no components overclocked):
CPU = Intel i7-4790K
Motherboard = Gigabyte GA-Z97X-UD5H-BK
GPU = EVGA GT740SC, 2GB DDR3
PSU = Silverstone NJ520 520W
Cooler = Corsair H100i
Storage = Samsung 850 Pro 256GB, WD Black 1TB
RAM = 1x8GB Kingston HyperX, 1600Mhz DDR3




Tests Conducted:


*For all dates after 7/28/14, the power supply in the unit being tested is a Corsair CX750M.


8-Thread “Small FFTs” - Prime95 (Windows)
#1. (7/28/14)
Starting test causes near-immediate (less than 5 seconds after starting the test) system crash without any prior warning. Tried this 3 times, same result. Event logs say it's Event 41, Kernel- Power.
#2. (7/29/14), (7/30/14)
Tried test twice with replaced power supply, same result as in #1.


8-Thread “Blend” - Prime95 (Windows)
#1. (7/28/14)
0:00 – Test begins. Temperatures are averaging in the high 40s (monitored for 5 minutes)
0:30 – Temperatures averaging in the low 50s and high 40s.
0:58 – System just crashed. Temperatures leading up to crash were in the high 40s.
#2.(7/29/14)- Power supply replaced with a Corsair CX750M I found at my local Best Buy for testing purposes.
0:00 – Test begins. Temperatures in the mid 40s.
0:30 – temperatures in the mid 50s.
1:00 – Temperatures in the high 40s/ low 50s.
1:30 – Temperatures in the high 40s/ low 50s.
2:00 – Temperatures in the high 40s/ low 50s.
2:30 – Temperatures in the high 40s/ low 50s.
3:00 – Temperatures in the high 40s/ low 50s.
3:30 – Temperatures in the high 40s.
4:00 – Temperatures in the high 40s.
4:30 – Temperatures in the high 40s.
5:00 – Temperatures in the mid 40s.
5:30 – Temperatures in the high 40s.
6:00 – Temperatures in the high 40s/ low 50s. End test. Test passed, 0 errors or warnings.


8-Thread “In-Place Large FFTs” - Prime95 (Windows)
#1. (7/28/14)
0:00 – Test begins. Temperatures are averaging in the high 40s and low 50s (monitored for 5 minutes after start)
0:30 – Temperatures in the mid/high 50s.
1:00 – Temperatures in the high 40s and low 50s.
1:30 – Temperatures in the high 40s and low 50s.
2:00 – Temperatures in the high 40s and low 50s. Test stopped, had to leave house. Will restart test tomorrow.


#2 (7/30/14) (with new power supply)
(1:12)0:00 – Test begins. Temperatures in the high 40s.
0:30 – Temperatures in the mid/high 50s.
1:00 – Temperatures in the high 40s.
1:20 – Left house, program still running. Not concerned about the temperature readings, they have been fine.
6:00 – returned to house about 20 minutes before 6 hour mark. Waited till 6 hour mark, ended test. Test passed, 0 errors or warnings. Temperatures in the high 40s up until end of test.


Memtest86
Ran 3 passes overnight, no errors found. This was before I got a replacement PSU.






I obviously found that there was an issue with my PSU, so that will be rectified. However, I have no clue what to do about the “small FFTs” test crashing my computer when none of the others throw any issues at me.
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Old 2014-07-31, 03:38   #2
potonono
 
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I believe it's been mentioned that the small FFT tests can product the most heat, so that's always a possibility, but I'm thinking it's more likely the RAM. Have you changed any BIOS settings? What are the voltage or clock speeds for the memory?
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Old 2014-07-31, 04:46   #3
scrawlings
 
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BIOS says the memory is at 1600Mhz and 1.5V, assuming that I'm looking at the right values. I'm near sure I am, but since I'm new to this I included the link to a BIOS pic just in case.

https://www.dropbox.com/s/yow4g4n4ag...%2004%20AM.jpg

Last fiddled with by scrawlings on 2014-07-31 at 04:47
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Old 2014-07-31, 13:17   #4
Prime95
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Small FFTs maximizes stress on the FPU, caches, power supply, cooling system. RAM is little used.

I'll bet you'll also fail the LinPack with AVX program -- which is even more stressful than prime95.
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Old 2014-07-31, 17:28   #5
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If your cooling is not up to the task, the small FFT's may cause your CPU to shut itself down immediately.
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Old 2014-07-31, 17:36   #6
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Quote:
Originally Posted by TheMawn View Post
If your cooling is not up to the task, the small FFT's may cause your CPU to shut itself down immediately.
OP posted temperatures in beginning.
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Old 2014-07-31, 17:52   #7
scrawlings
 
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Quote:
Originally Posted by Prime95 View Post
Small FFTs maximizes stress on the FPU, caches, power supply, cooling system. RAM is little used.

I'll bet you'll also fail the LinPack with AVX program -- which is even more stressful than prime95.
I've never heard of this, can you link it? I'll try it out and see.

Edit: additionally: if the FPU or caches are the problem, does that mean I'm looking at a new processor?

Last fiddled with by scrawlings on 2014-07-31 at 17:57
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Old 2014-07-31, 17:54   #8
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Quote:
Originally Posted by TheMawn View Post
If your cooling is not up to the task, the small FFT's may cause your CPU to shut itself down immediately.
My temps under the other tests were nowhere near an overheat. Although I can't be sure, I doubt it's my cooling.
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Old 2014-07-31, 18:07   #9
Prime95
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Try LinX from here: http://www.xtremesystems.org/forums/...terface/page36

If that doesn't work google should be able to find you a download site
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Old 2014-07-31, 18:55   #10
Antonio
 
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Quote:
Originally Posted by kracker View Post
OP posted temperatures in beginning.
OP only quotes one temperature so is possibly using a motherboard utility to read the processor temperature.
I would suggest using something like RealTemp, Core Temp or CPUIID HWMonitor to get a better estimate of each core's temperature.
My motherboard utility measures at least 20deg. C lower than all of the above when the processor is being stress tested.
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Old 2014-07-31, 20:55   #11
scrawlings
 
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Quote:
Originally Posted by Antonio View Post
OP only quotes one temperature so is possibly using a motherboard utility to read the processor temperature.
I would suggest using something like RealTemp, Core Temp or CPUIID HWMonitor to get a better estimate of each core's temperature.
My motherboard utility measures at least 20deg. C lower than all of the above when the processor is being stress tested.
I wasn't using a motherboard utility, I was using the Corsair Link software. I double-checked that it was reading the temps correctly by comparing the HWMonitor readings and the Corsair Link readings while the computer was under load, they were the same.
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