Trouble with GTX 560 Ti

those sites with do benchmarking results should really be used as a ballpark figure, because every rig is different. you have to remember that the graphcis card itself isn't what's pushing the fps, its the entire system. graphics benchmarks are useful for comparing graphics cards, not seeing whether your rig stands up to their benchmark. unless, of course, your rig is similar to their testbench (which usually isn't the case since they always have a rather hardcore one lol).

25-30 sounds good, if you overclock your stuff you should easily push 40, which for crysis is smooth (thanks to motion blur!).

in terms of overclocking you have a B.E. so you can overclock using the CPU multiplier (makes everything easier). it depends on your motherboard. In anycase, the 970's highest overclock (from what i've tested and seen on other forums) is 4.1ghz with a fairly high voltage 1.5 (the default voltage is... I think... 1.25 or something). 3.9-4.1 is stable with good cooling and a good PSU. read your motherboard manual on how to access the BIOS and overclock using the multiplier.

you could also overclock using the FSB and multiplier. for example:

fsb: 200x14=2800mhz
fsb: 220x13=2860mhz

put simply, the higher FSB will increase your bandwidth, as well as your RAM clock speeds. while it is a little more complicated than this, thats it in a nutshell.

note: raising the multiplier has no effect on PSU and tends to run cooler. Raising the FSB will make the NB/SB (motherboard chipset, the "nerves" of the computer), the CPU (brain) and ram (limbs) of the computer run hotter.

for the graphics card, get MSI afterburner or EVGA's precision, and begin to mess around with it. pick up MSi's Kombuster to benchmark your card as well as stress test for stability.

above all else, you MUST have a 600+ watt PSU and good cooling for the case and the CPU. Otherwise, be careful about overclocking.

some other things:
-MAX temp ceiling for the 970: 62 (after this it begins to perform extremely erratically and you may permanently damage the chip, try to keep it below 55)
-overclocked phenom II processors EAT watts when they're overclocked. expect a 200watt extra draw on your power supply (worst case scenario). for reference, a system in FULL LOAD with a 560ti averages to around 360-400 watts TOTAL power consumption.

hope that helps. again i'm not the most learned person on this stuff so its best to take a look at forums for really in depth stuff (its how i learned all this!), but for quick reference or maybe just to pique your interest you can look at what i posted. good luck!