IC7 + 2x512mb=the bad

[JNav89GT]

I can get my Abit IC7 and my 2.4C up to 290fsb with either Twinmos PC3200 or Kingston value PC3200 C2.5 at the 3:2 divider. Wanted the 5:4 divider so bought 2x512mb of Twinmos PC3700 memory. Well this memory won't even work at 290fsb at 3:2 at conservative timings and mem voltage at 2.8v. I had some buffalo PC3700 that was 512mb dimms as well and exhibited similar behavior but just passed it offf as way too oc'd ram as their PC3700 is still winbond BH-5 chips. Well now I think that the board just can't push that much ram at that high of fsb despite the dividers. So if people want to run 1gig of ram this might be a consideration to buy a faster cpu and consequently need a lower fsb for the same or higher mhz. At least in my experiences my Abit IC7 and my Asus P4P800 sux with oc'ing while 1igig of ram is used via 2x512mb dimms, haven't yet tried 4x256mb

[S_T]

Same thing on my IC7. With two sticks of 512 twinmos/winbond bh-5 at 270, 5:4, 3v and fastest timings rock stable. At 273 with relaxed timings it won't even run 5mins of prime.
Hope this is only a timing in the bios and they can fix it some day.

[Zroc]

Nah, it probably won't be fixed by the BIOS...it's just always been that way. It gets even harder when you use four dimms, and would hardly overclock at all when I stuck four 1GB DIMMS in it.

It's simply logical...the more memory it has to address, the more work the board has to do, the less you'll be able to overclock it.

JNav89GT: 290 on the 2.4? So what'd you find that fixed it? Because you made a lot of posts about not being able to get to 250 stable, and 80C temps and such....

[JNav89GT]

well I got mad and got the Asus P4P800 board to replace the abit figuring that was it. Got the Asus and no help. So decided to build another system with the IC7, 2.4C, and rad8500 in another case. Just started inching up and couldn't believe it. Somehow that other case is cursed. I tried swapping powersupplies, vid cards etc... into that case that has the Asus now with the 2.8C and nothing helps for high fsb. I may tear that whole sys down and thoroughly examine it. But for now I am happy somewhat with the IC7 and 2.4C. The 2.8C on the other hand is a giant turd only doing 3.3 or under stable no matter what vcore or aircooling I use. I have tried the 2.8C on both boards again and on the known working IC7 in the new case now with similar results. Nothing helps. Anything over 233fsb and it errors in prime. I can boot at 250 but nothing is stable so :(
oh well, thats life. I appreciate all your help with the 2.4c though