good
higher clocks for your rams with loose timing does not give you a better efficiency, but if u choose the best combination between clock and timing it gives you better efficiency, if you can test your gtx570 again with that 1350mhz 10-12-12-25 and tigher TRFC (for me the best efficiency was 1333 10-12-10-28-1t and trfc:96)probably can get better score, that work for me in vantage and 3d11 and 06 cpu score,wprime,super pi .... and maybe has a good effect on aqua
and i'm not sure if win7 is better or xp for 570