Well, I assume RV530 is the pro model...and it's supposedly confirmed that it's 16pp...who knows if it's a different chip or just just a failed R520. Considering the yields though, it'd make sense they'd use failed R520's to make the lower-end chips, as otherwise (according to the yield rumours) they'd be wasting a WHOOOLE lot of money on those wafers.
And remember, 7800GT's are prolly just gtx's with a failed quad and they're using them to use the failed yields of the gtx, and they will probably overclock pretty well...I mean, look at how close the core clockspeed is to the GTX...and even if the mem is rated at 1100, it probably uses the same stuff as GTX, so you can expect a similar clock there as well. I truely only think the 20p vs 24 pipes is going to make a 2-3% differance anyway...(based on a 5% differance of a GTX vs 6800GT/U at same clocks..16pp vs 24pp) so assuming the GT can hit similar clocks to gtx, it'll be a good deal just like the 6800gt was. Who's to say RV530 couldn't do the same, it'd especially be true under Alexio's reasoning. I do think that ATi's pipes are better than nvidia's though, and it might make a bigger differance than 5%. I imagine RV530 will clock overall just slightly better than a x850xt or something, with the same amount of pipes, but probably better pipes then that previous gen. I expect RV530 and 7800gt to fight tooth and nail, but who knows...There will obviously have to be a winner. We'll know when we see some benchies for it...We've already seen 7800gt benchies, and they're smack between 68U and 78GTX, I expect RV530 to be the same with x850xt and R520...so again, it'll be close, might come down to price and availability.
But yes, things are shakey. We should know in the next month or so though...
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