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AFAIK the i7 3930K wont work on a motherboars with the z77 chipset...
The I7 3770K is better than any I5 because it has Hiperthreading and use faster clocks, but the difference on performance of the CPU for crunching with SETI or any other BOINC project might not be worth the price as the HT techonology doesnt doubles the performance... Having 8 cores you will be able to crunch on 5 or 6 of them getting about the same throughput as if you were having an i5 and you will still have another 2 or 3 free cores to do other things on your host... (YMMV)
2 560Tis on a 650W is definetely on the limit of what the PSU can deal, specially if the PSU its not new and/or if its not a very good one, but what really matters is the power supplied in the 12V rail/s you need 340 Wats just for the GPUs plus something else for the disks, DVD and also you should have some headroom... so your PSU should be able to give 400W (around 33 Ampers) of those 650 total wats just on the 12V...
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