Prime95 error?

[AmbitV]

I've got a coppermine 550e that's stable at 795mhz 1.55v(prime95 for 24 hours) on soyo 6ba+iv...cpu diode in MBM reads 29 celcius...

Now whenever I up the speed to 825 mhz, I get an error in prime95 almost immediately. I've even up the voltage in increments all the way to 1.95, still no good. Funny thing is I can even overclock to 850 mhz (max for my motherboard), and windows still seems to run fine.

My question is could the error in prime95 be given by something other than CPU error? The FSB for 795mhz is 144 mhz, and for 825 is 150 mhz, and for 850 is 155 mhz. Is it possible that the FSB could cause that error? Or are Prime95 errors only generated by the cpu?

I guess I've run into the limit of my cpu...but seems strange that I can run so cool and stable at 795mhz 1.55v and then not be able to get 825 even at 1.95v.
Running on MSI slocket, FC-pal 35t with delta 38cfm fan, crucial 128mb CL2 (set it at 3-3-3 just to be sure it's not the memory at those high speeds)
Also I'm using AOS HTC, would arctic silver help any?

 

[AdamK47]

It could be the memory. Have you tried the -PCI option (aka: the 100MHz memory selection in the BIOS)?

 

[Frosty20]

What is the error message?

Look in the readme file for POSSIBLE HARDWARE FAILURE and see what it sez.

CPU temp looks good, memory might be the problem at 155 Mhz...but remember, the 440BX was designed for 100 Mhz operation-it might just be maxed out.

 

[polar]

how does it run in 3d? prime95 heavily tests the FPU, windows(and most apps) only use ALU.

 

[AmbitV]

my mobo wont let me set memory and fsb asynchronously

error message is rounding error....

I'll try some 3d programs tommorow. Windows seems to run fine though

thanks for the responses

 

[AdamK47]

Oops. I didn't see that you had the 6BA+IV. I had almost the same board it was the 6BA+100 (same PCB design). I wouldn't run 100% stable at 150MHz FSB while my MSI i815E board would run at 157MHz with the same chip. A 650E at 1021MHz. I have a feeling it's a limitation of your BX. Anything around and over 150MHz FSB varies with each board.

 

[Packet]

I would guess on RAM or Chipset

You could try getting an active cooling solution for the chipset, old greeny can be a bit lacking at times.
Or you could try slapping some thermal grease inbetween the chipset and the greeny if you don't want to spend much money.

 

[AmbitV]

hmm interesting, I swapped out my Crucial 128 CL2 for a CL3 stick I had....set it at 3-3-3 and fired it up.....now it runs at 825 mhz 150 fsb without the error...

so I guess those Prime95 errors don't just come from the cpu

also I think that cl2 stick is damaged...cuz whenever i use that stick it gives a message on bootup saying "warning: spd not found"...I think it may have to do with me running it at 2-2-2 150 mhz for about a year

 

[Poof]

also I think that cl2 stick is damaged...cuz whenever i use that stick it gives a message on bootup saying "warning: spd not found"...I think it may have to do with me running it at 2-2-2 150 mhz for about a year

Not all sticks have that SPD circuit on them (it's a tiny rectangular chip in the corner). It's supposed to automatically feed the CAS settings to the BIOS (when set to auto). I have a stick of Muskin ECC PC100 that doesn't have it and I get that message too, although I can still manually set the CAS values in the BIOS.

 

[AmbitV]

hmmm but I would think Crucial memory would have the spd...all my other crucial ram has it....
and on top of that, I don't recall that warning message coming up in the past....