Question with E8400 and Prime95

[ScottD]

Hello all, I am new to the forums as a poster. I usually just troll forums and soak up information, but I am running into some problems with prime95 and my 8400 o/c.

I am using 25.7 build 3. I start running the small FFT test and my worker #1 stops instantly with an error. FATAL ERROR: Rounding was 0.5, expected less than 0.4. It tells me to consult stress.txt but I cant find that txt file anywhere. So my core0 does nothing, while the worker #2 keeps going fine and my core1 is maxed at 100%.

I am just wondering if there is any known issues that would cause this? I have no stability problems, but I wanted to test it with prime95 to be perfectly safe.

This happened at 3.6, 3.8 and 4.0 ghz.. no matter what I did to Vcore. At 4.0ghz I am sitting at 9x445. Bios Vcore is set to 1.4375 and reads 1.39 in CPU-Z. I was fine running as low as 1.4/1.36 but I thought maybe the error was because of low voltage. My temps are fine btw, idle they are 35 max load around 53.

As far as my memory goes, I have g-skill 2x2gig 800... so I am running them at 890 with my current o/c .. I bumped the ddr2 voltage up to 1.85 and lowered timings to 6-6-6-18 .. they came at 5-5-5-15. I have my FSB, MCH both +.1 .. not sure what the voltage is on them default .. sorry.

I am using a Gigabyte GA-P35-DS3L mobo with F8a bios. I hope thats enough information, if anyone has any suggestions I would greatly appreciate it.

Edit: Running Vista64 in case that matters.

Scott

 

[M1A]

I bet its a memory problem, you are you running 1:1 from what you said, try dropping the ratio back to get you memory down close to 800 if you have that option in bios. If not you may need better memory to get the high oc you are looking for. I had to go to 1066 memory the 800 I was using did not cut it in orthos or prime........
What voltage is the memory rated for? If your g-skill is rated higher take it to 2.0/2.1V

 

[ScottD]

The odd thing is it did it at 3.6 also with a 1:1 that makes it running stock 800. So if it is my memory, it might just be bad in general. Btw I cant go any lower, 2x is the lowest memory multiplier for my mobo. Thanks for the reply though, I might try and talk my gf into taking the 2x2gig and pick up some 1066 stuff

 

[VirtualLarry]

Try it with Prime95 25.6, to make sure it's not a bug with 25.7. I don't know how well tested 25.7 is yet.

 

[disports]

What G.Skill ram is that? The regular DDR2-800 selling for $49.99 on newegg right now? 1.8V 5-5-5-15 timings? You may just have bad ram when it comes to O/Cing. I have that ram at 445 x 9 with 1.8V 5-5-5-15 timings and I'm good.

 

[ScottD]

Yes that is the ram, or atleast the V and default timings. I tested it at default 333 fsb.. ran fine.. pushed it up to 400x9=3.6 and the first run it got an error. That is what memory still at 800. So I added +.1 to the FSB and that fixed it. Pushed it to 3.8 and I cant get a good run for nothing. Going to try the 25.6 and see if that makes a difference, thanks again for the help.

 

[FalseChristian]

Run 3DMark2003/2005 and 2006 and see if your overclock holds and forget about Prime95 for now. Most programs aren't gonna utilize 100% of the core very often.

 

[betasub]

Originally posted by: ScottD
I usually just troll forums

:Q I hope you mean trawl... because the mods don't take to kindly to trolling.

BTW I think you are doing the right thing by trying small voltage bumps (also check Northbridge and RAM/DIMM voltages) so that the RAM isn't causing P95 errors.

 

[ScottD]

lol yep thats what I meant

Working on a 3.8 o/c .. its working out so far. Will run prime95 when I get some sleep later and see how long it can go. So far it has ran for 30 min with these settings, not that is a lot, but for me so far its been the best

 

[ScottD]

Ok, well I have it stable at 3.8, but I brought my settings down from 4.0, so I might be able to lower my settings a little more and stay stable. Anyway here is a Screenshot of it

3.8ghz