I cant imagine the timing on any of those getting down to where I need it. My kit was sold at a cas 7 or 8 with speeds of 2133 or 2200. Cant remember exactly.
OK, the best and easier way to find out is:
turn off PC
open case and remove one Dimm, write down exactly what is says on the module.
This would greatly narrow down your search.
post back, with the exact model and speed on your module, is the best way to help you out.