How far can I push Corsair XMS?

I've got a AXP-M 2600+ running 2.6 GHz (13 x 200) @1.85v, Abit NF7-S v2, and some Corsair XMS CMX256A-3200C2 running 2.5-3-3-11 at 2.7v.

I want to know how far people have seen this memory pushed using the OEM heatspreaders. Memory and voltage. I've tried 215 and it seems to run fine, but if people have a better setup for that please let me know. Any other comments or knowledge is welcome. Thanks!

-Leon

I have similar memory (2x512MB CMX512-3200C2 Dual Channel) and it does not go very far. Anything over 200FSB is not prime stable for longer than 12 hours. However I get pretty good timings at 200FSB. I can run 2-2-2-5 at 200FSB @2.8v.
I don't even know what these sticks are rated for... I think the package says 2-3-3-6 at 166FSB. CPU-Z says 2.5-3-3-8 at 200FSB and 2-3-3-7 at 166FSB.

Anyways not much in terms of OC, but timings are pretty good.