Originally Posted by bigvaL
There IS an X1900XT 256MB and an X1900XT 512MB.
X1900XTX 512MB > X1950XT
The "extra speed" of the X1950XT is nothing. The fact that it uses GDDR4 and has fast memory doesn't help it. The GDDR3 at 1550mhz on the XTX beats out the 1800mhz GDDR4 ram. It's like any ram. The GDDR4 is faster but the latency is higher.
The X1900XTX falls 1-5 FPS short of the X1950XTX in most tests. The GDDR4 is at 2000mhz on the X1950XTX and it barely helps.
Acually the 1950XT series use GDDR3, and I checked Vs default latency's of my friends x1900, and they were lower on my 1950. However, like you said, memory speed doesn't seem to be much of an issue with these cards anyways.