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IS7, 255mhz wall?

T

Telkar

n00b
Joined
Jun 4, 2004
Messages
6
So I've had my P4 2.4c M0 and IS7 running happily at 3ghz since January. Runs 2x Prime95 for a week at stock voltage, no issues at all. But the second I attempt to overclock past 255mhz fsb, everything goes nuts. I could jack the vcore up to 1.8 if I wanted (and I did to test) but no matter what, it bluescreens when it hits windows. I've tried a 3:2 divider, I've tried loosening ram timings, everything. It just will not do it. So that leaves me thinking it's the 865 northbridge holding me back. Thoughts? Wish this board had an option to bump the I/O voltage, that'd probably help.
 
try setting the GAT to auto-normal-auto-disable-disable.
 
It sounds like the infamous Winbond CH5 brick-wall problem. Which memory are you using?
 
I had the same problem. I had the exact same Corsair XMS RAM and would hit a wall at 250 FSB, no matter what divider I used (ABIT IS7, 2.6c).

Because I needed more memory for SWG, I purchased 1GB GeIL PC3200 valueram and threw the Corsair in another computer. Now I'm able to overclock much higher--265 FSB--with that cheaper GeIL RAM. If only I had purchased some PC3700...oh well. 3.4 GHz is good for now.

CH5=BAD
 
Well, atleast I'm not alone. Thanks for the replies, guess I'll have to deal at 3ghz. Don't have the cash to throw out on another gig of ram. :(
 
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