I would pick the 560 personally. One 260 gets about 9k to 10k RAC (check Quietice's post on CUDA production) and I would bet a single 560 could at least nearly do that. The 560 is a Fermi core and is more power efficient (RAC/kWh if that matters to you) After getting the 560 I would save up for another one lol.
These cards are rather new. If someone is using one post in the CUDA thread I mentioned above.
Im replacing an opty that has 2x260s, and I know myself once I get one set up I do not upgrade until I build a new one so Im thinking of best performance on seti as it will crush the other stuff im doing
Antec Three Hundred Illusion Black Steel ATX Mid Tower Computer Case
2x HITACHI Deskstar 7K2000 HDS722020ALA330 (0F10311) 2TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
EVGA 01G-P3-1561-AR GeForce GTX 560 Ti FPB (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support FPB Video ...maybe
KINGWIN Mach 1 ABT-1220MA1S 1220W ATX / BTX SLI Ready Modular Active PFC Power Supply
G.SKILL Ripjaws X Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9Q-16GBXL
ASUS P8P67 PRO (REV 3.0) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
I would go for the 560Ti myself. I own the EVGA 01G-P3-1563-AR 560Ti model myself which runs at 900Mhz. Depending on what 260 models you are comparing to you'll have twice or nearly twice the number of CUDA cores and much higher clock speeds with the 560Ti. And half the power consumption.
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