I have to say, compare with TDP, is risky, especially in AMD part
recall the last generation of both side: (3D load from Xbitlabs)
nVidia: G80GTX, G80GTS, G92GT, G92GTS, G94GT
AMD: R600XT, RV670XT(3870), RV670P(3850)
G80GTX: TDP 175W, 3D load: 132W
G80GTS: TDP 140W, 3D load: 105W
G92GT : TDP 110W, 3D load: 78W
G92GTS: TDP 140W, 3D load: 100W
G94GT : TDP 100W, 3D load: 60W
========================
R600XT: TDP 180W, 3D load: 162W
RV670XT:TDP 125W, 3D load: 81W
RV670P: TDP 95W, 3D load: 60W
so, what about 236W of GTX 280 and 182W of GTX 260
and what about 157W of 4870?
I don't jump into any conclusion, but I have to say the reality may vary with what we thought and discussed of TDP now.
RV 670 did well in term of power consumption, BUT, in fact, G94GT supress RV670 XT in term of perf/power because it achieved the same level of perf with 20W less.
R600XT, while only 5W more cf. G80GTX in TDP, actually comsumed 30W more in reality, not to mention its miserable performace (which is on par with G94GT at best)
I believe TDP to real 3D load ratio of RV 770 is much like the patterns of RV 670
but if it is like the ratio of R600XT, then I won't be surprise if 4870 outnumbered GTX260 in power comsumption.
What I cannot figure out is
Despite of 4870 may have much lower perf/power ratio then GTX260, someone still claimed that 4870 is suprior in term of best perf: Power balance
AMD did have some amazing part of its GPU, but while talking about performance
Why someone just think 4870 would stand on the sweetest point of perf/ power?
not 8800GTS or GTX 260? it is just irrelevant.