Factory overclock for my card:
Memory: 1950 (3900 effective)
Memory: 2100 (4200 effective)
My card is the Palit GTX 570 Sonic, which I got because of the non-reference dual-fan cooler. I'm using MSi's Afterburner utility to overclock. My current overclock seems to be stable, but I'm wondering what other GTX 570 users have gotten so I can see when I might be approaching the overclocking ceiling.
Nah. I don't want to blow up my 570, and people have even blown them up at 1.075v according to a thread at Overclock.net forums. Apparently the power circuitry isn't up to snuff on 570s.
Edit: Admittedly, those have been cards based on the reference design with four power phases. Apparently my Palit Sonic has six (GPU) plus two (RAM) phases -- at least according to pics of a Sonic Platinum. I'm not about to rip my card apart to find out though.