Bit-tech has a pretty good review up pitting various X1900s (XT/XTX/AIW) against each other and the Geforce 512 GTX as well. Worth checking out, give it a look: http://www.bit-tech.net/hardware/2006/02/10/radeon_x1900_series_roundup/1.html
I like this websites reviews because it's one of the few out there that actually uses Adaptive AA/TRSSAA and HQ AF for their testing.
Edit: Just caught something interesting when reading the review:
Also IQ comments when testing Need For Speed: Most Wanted:
The main negative thing they had to say about the ATi cards was about Crossfire:
I like this websites reviews because it's one of the few out there that actually uses Adaptive AA/TRSSAA and HQ AF for their testing.
Edit: Just caught something interesting when reading the review:
There are often times where the GeForce 7800 GTX 512 can suffer from what is known as 'texture shimmering'. The problem isn't apparent in Call of Duty 2, but the detail in the distance looks appreciably better on the Radeon X1900-series cards when high quality anisotropic filtering is enabled.
Also IQ comments when testing Need For Speed: Most Wanted:
The GeForce 7800 GTX 512 was as fast as the Radeon X1900XTX and we found that we were able to turn on high quality driver settings to disable all filtering optimisations. This gave us a higher filtering quality, but it wasn't quite enough to match the high quality anisotropic filtering that is possible on the Radeon X1900-series cards. It performed well and we were more than happy with the gaming experience if it was singled out, but wasn't quite as good as the image quality delivered by the X1900XTX.
The main negative thing they had to say about the ATi cards was about Crossfire:
The one reason not to get a Radeon X1900XTX at the moment would be ATI's CrossFire technology. It seems a little strange that ATI chose to use the Radeon X1900XT clock speeds on the CrossFire Edition card, as it means that the Radeon X1900XTX will be clocked down to the same 625/1450MHz, rendering the additional cost for an XTX a little pointless if you've got the vision of moving towards CrossFire later down the line.