That's a tough question to answer. It's certainly possible. But only someone with the same exact memory you have will be able to answer your question for sure.
So... don't count on an answer anytime soon. That's some pretty elite stuff ur looking at there.
EDIT: if your concerned about timings, I would look for some low latency DDR433 memory from OCZ. Like this:http://www.ocztechnology.com/products/memory/ocz_el_ddr_pc_3500_gold_gx_xtc
This way you can have your cake and eat it too. You can losen the timings if you wanna OC beyond DDR433 or you can just leave it at DDR433 w/ 2-2-2 timings.