AMD 4000 overclock and prime95 error

j1mbo

j1mbo

j1mbo

Associate
Joined
23 Nov 2007
Posts
4
Hi, ive got my amd 64 4000 single core 939 chip overlocked to 2945mhz with a fsb speed of 245 mhz and multiplier set 12x at 1.5v. I have 2gig ocz el gold dual channel pc 4000 ram. My system seems stable and will complete many 3dmark tests without crashing. If i take the fsb speed to 250 mhz the temps are still pretty low, around 38 degrees c on idle and upto 56 degress under load but at 250 mhz the system crashes, i cant see any option in the bios to go over 1.5v my mainboard is an asus A8N-SLI SE so probably not the best. Does wnyone think it would be possible to get 250mhz fsb and have a stable machine with my setup?

Also when i run a prime 95 torture test it fails after 4 minutes with the following error: Fatal Error: rounding was 0.5, expected was less than 0.4. What does this mean? and what can i do to stop this happening? im new to prime 95 so i dont really know how it works.
 
Last edited:
Have you ticked off "round of checking" in the prime 95 menu?

A slight voltage bump may resolve the problem. As you mention the motherboard voltage does not exceed 1.5v. You may need to back off the O/C slightly and check stability with prime again.
 
Last edited:
Thanks for your reply, im running at 245 mhz fsb at the moment as 250 wont hold stable. At 245 mhz it will complete 3dmark tests all day long. I had the HT link set in bios to auto which, by looking at cpu-z had it set to 3x, ive just set this manually to 4x in the bios and noticed a good increase in 3dmark scores. Have i got the ht link set correct at 4x or could this go higher?
 
Test ran for 10 minutes this time then failed with the same error, think ill knock the fsb down 5mhz and try again. My memory timings are cas 3, trcd 4, trp 3, tras 8 which are same as the spec on the coz site. Would changing the timings have any effect on stabilty on prime 95?
 
You must log in or register to reply here.
Back
Top Bottom