i5 3570K is 238 right now vs 229 for 2500K, which is better for gaming. I plan on getting z77 mobo either way, and hd 7850. If later I want to crossfire, will pci 3.0 give any advantage over 2.0 with sandy? I know single 7850 makes no diff on pci 3 or 2, but how about crossfire?
One thing holding me back now, is that I have a hunch 2500K price will drop soon too...
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Sandy Bridge K-chips are popular with overclockers and are approaching end-of-production while Ivy Bridge K-chips production is ramping up so I'd say IB CPUs including K models are more likely to drop than SB K-chips.
As for SLI/crossfire, there already is very little difference between x8 and x16 on PCIE 2.0, it will only be even smaller on 3.0 with current GPUs. Things might change with next-gen GPUs.