Klaxian, you have lot's of choices there. Since you have inadequate cooling for your X6, the most competitive thing to do with what you have is use the 2500k. However, let me give you a few numbers to see how you feel.
4.5-4.6GHz on Native Linux will complete 6904
4.7-4.8GHz on a VM of Linux in Windows 7 will complete 6904
RAM is a pretty big variable. The lower clock of the 2 will work with 2133, but probably struggle to complete it at anything lower depending on the timings etc.
If you continue using your 2500k while folding, the higher of the 2 clocks will likely be needed and maybe 100MHz higher for heavier usage. What can that chip do, and what OCZ Ram is it specifically?
ali7up, you are golden my friend! 6901 means it is working. 6901 has been assigned quite often in i7-1 here lately. It is the old bigadv, and 6903/6904 is newer or huge as we call it.
awesome, now will my server running Dual Xeon 5620 @ 2.4ghz be able to do bigadv (VB ubuntu) at stock speeds. I can't overclock them due to aftermarket cooler space restrictions.