why is this strange o/c prob happening???

hi

got a nf7-s v2 and an unlocked barton and 521 meg (2 x 256 twinmos) of 400 ddr ram channeled. it's set at 11.5 x 200 at moment and it's stable.

when i select it to 10 x 200 - as aparently better, or 10 x 205/210 it's unusable. it's baffling me as i want to really crank it up to.

i have recentl brought a cwt scan 450 wt psu which is going good. i havent touched any other settings in the bios apart from fsb and multiplyer.

should i be touching all the voltage etc, which scares me.

my g/card is a radeon 9800 pro with a new artic cooler on it. i have a new cheiftec BX case for maximum space and cooling and it's fairly tidy now.

anyone got any idead's on this? is it worth a bios update - think i did it with the new tool.

please help :confused:

Depends on what type of ram you may be using?
If it's a decent brand then just give it a bit more vdimm or try slacking the timings slightly.
Seeing as it does 11.5*200 but not anything over 200 then I would suggest ram holding you back.

i've got twinmos ram, matching pairs. pc3200 @ 400 mhz

I though I heard on some "other" ;) forums about incompatibility problems with Twinmos ram and N-Force 2 mobos??
Might be worth looking at?