I am currently running two HD 5870's in crossfire and I was wondering if my CPU would limit any possible gains of adding a third 5870 for triple crossfire X. I just read a review that shows some pretty significant difference when adding a third card but the reviewer had the new 6 core intel chip (the 980x). The reviewer left the CPU at stock clocks. If I upped the OC of my CPU would I see similar gains?
Agree with Shadow, at 3.2 you might be bottlenecked in some instances but there have been more than 1 article on the "net" that have mostly agreed that 3.6Ghz is the "sweet spot" for getting the most out of your system for the cost/heat/efficiency etc.
I'd say OC to 3.6Ghz if you can and you should be just fine. The 6-core is at the moment overkill unless you have money to burn. The cost for the extra you will actually see is negligible in games for now.