Prime95 - Causing system to crash

Yannic

Yannic

Yannic

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Joined
20 Jun 2005
Posts
192
Hi

Just having a few problems while trying to OC my Athlon S939 4400+.

HT set to 3x
Mult set to 9
RAM @ 100Mhz DDR
PCIe @ 100Mhz
PCI @ 33Mhz

I tried to put up HTT and it will boot up to around 240 on standard volts, 1.35? I then was able to get it up to around 275 with 1.4v. However when I try running Prime95 after about 10 minutes the system poweres off and needs to be restarted.

I tried rolling back the speed but still, it crashes. So I decided to undo all settings and return them to normal.

HT set to 5x
Mult set to 11x
RAM set to 200Mhz
PCIe @100Mhz
PCI 33Mhz
HTT 200Mhz

Then I decided to run Prime 95 again and still, after 10 minutes - the system went black screen and powered off on stock - hence im really confused.

System:

Athlon S939 4400+
Asus A8n-SLI deluxe
2GB (2x1GB) Corsair PC3200
Nvidia 8800GT 512MB
Thermaltake Toughpower 850W

3 hard drives connected on Sata 1,2,3
2 optical drives connected on same IDE lead.
 
Check temperatures through either coretemp or the Asus probe software and make sure its not overheating. Not sure on the Athlons what sort of temperature is normal but would be worth checking that out
 
which prime test are you running?
As the Blend test stresses more than just you cpu so could point to Ram, etc
if you havent already try the small or large FFT's test and see if it still crashes.

If you are using the Blend option try testing your memory with memtest to see if it passes ok.
 
Yannic said:
RAM @ 100Mhz DDR

RAM set to 200Mhz

2GB (2x1GB) Corsair PC3200
Click to expand...
I'm a bit confused by those memory speeds? Your using a memory divider right? if so I had some problems getting Corsair memory to play nicely when running on a divider, however I swapped it out for some OCZ stuff and that works great.

You need to work out what makes the memory happy, don't just assume it can work on any ratio because it can't, at least the two sets I tried couldn't.

In the ASUS Bios it should be on 400MHz for 1:1 ratio, then you have the lower options that try to run the memory on a divider, think these are called 333Mhz and 266MHz, have a play at much lower clocks and see how the memory takes to be flexed about.
 
Last edited:
i got memtest working. It ran through all the memory fine.

With regards to Big Wayne,

I set the memory to run as slow as possible. which on my board is half the speed to what it is rated for. I.e. setting it to 100Mhz instead of 200Mhz.

I tried the other Prime95 tests which ran fine, it was just the blend test that conks the machine out.
 
Yannic said:
I set the memory to run as slow as possible. which on my board is half the speed to what it is rated for. I.e. setting it to 100Mhz instead of 200Mhz
Click to expand...
Yes I understand what you are trying to achieve, running the memory on a lower divider, taking it out the equation, but your assuming that the memory is happy doing this, some sticks are and some are not, weird I know and it can change again when you swap processors because the memory controller is on the chip.

Do some divider tests to find out, Prime 'Blend' will work well. I didn't have much luck with Corsair or Crucial myself, but I got some nice OCZ platinum PC4000 that just is truely flexible.
 
ah thankyou.

I'm trying out

250 HTT @ 1.5v
HT = 4x (Without actually having tested it, this (4xHTT) should roughly be Under 1000?)
333:400 DDR Divider @ 2.8v

This way am I correct in saying that the RAM is in effect running at

333/400 * 500 (2x250) = 416.25Mhz DDR or 208Mhz actual ?

Thanks again (Im planning to turn those voltages down a little but Im just checking to see this actually work - ive never managed to get an OC to work before through boredom)
 
Yannic can you run these settings and test using Prime 'Blend'

166oz5.jpg

HTT X 4

133kv7.jpg

HTT X 3

You would expect these to pass although your mobo might not like running all the way to 300MHz FSB or perhaps as already mentioned your memory doesn't like running on a divider?
 
Yannic said:
They both booted ok, although had to drop the 2nd clock down to 273 for it to pass
Click to expand...
When you say 'pass' what do you mean? Pass what? Boot or a certain test?

All things being equal you should be able to pass prime blend testing at both the above settings, failure to do so implies there is indeed a problem, either with your chipset or your memory not liking running on a divider.
 
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