What I find funny is that scores in other benchmarks don't change. Here's a way to settle this debate over which 3DMark2003 score is correct... nVidia's way, or FM's way...
Performance difference in % between 9800XT and FX5950 according to AnandTech.
Aquamark3 - nVidia 1.5% behind ATI
C&C Generals - nVidia 26% behind ATI
F1 Challange '99-'02 - nVidia 7.5% behind ATI
FFXI - nVidia 5.3% behind ATI
Halo - nVidia 10.7% behind ATI
Homeworld 2 - nVidia 22.8% ahead of ATI
Jedia Night 3 - nVidia 15% ahead of ATI
Flight Sim 2004 - nVidia 40% behind ATI
Neverwinter Nights - nVidia 13.5% ahead ATI
Simcity 4 - nVidia 28.6% behind ATI
Splinter Cell - nVidia = ATI
UT2k3 - nVidia 3.9% behind ATI
X2 - nVidia 4.2% ahead ATI
Warcraft 3 - nVidia 10.4% behind ATI
Wolfenstein ET - nVidia 1.5% ahead ATI
nVidia is about 5.5% slower than ATI on average
Lets look at 3DMark Scores... I found a user using the stock 9800 pro speeds and a 3000 Mhz Pentium 4... he score 6500... so, if 3DMark is accurate, 5900 Ultra speeds with the same speed processor should be 5.5% lower than 6500, which woudl be about 6150... so lets see... I see a P4 3000 Mhz with a FX5900 Ultra at 450/850 scoring 5300... which is well shy of the 6150... lets look some more... here's another that's below 5300... have a look for yourself if you want... use "project search and compare" and sort based on the relevant criteria. That was with the 340 patch, lets see what kinda of numbers we get from build 330... I see a few in the 6300's, and even more in the 6200's.
BTW... I won't tell you which projects I look at so you all can look for projects with the video cards at stock clock speeds, with similar processors at similar clock speeds and see the results for yourself.
So it looks as though Futuremark is handicapping nVidia in such a way that it DOES NOT reflect real world performance. It may reflect performance in a few select games, but look at Homeworld 2... nVidia is WAY head of ATI there... so you could say 3DMark 2003 isn't accurate because nVidia should be scoring at least 20% higher than ATI because it does in Homeworld 2.
I don't see how even the ATI fanboys can argue against this...