I think HD2900GT performs slightly better than X1950pro
However, for $20 more you can get 8800GS 384MB and it is better than both
Newegg.com - XFX PVT88SFDF4 GeForce 8800GS 384MB 192-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
And it is a single slot as well
However, for $20 more you can get 8800GS 384MB and it is better than both
Newegg.com - XFX PVT88SFDF4 GeForce 8800GS 384MB 192-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
And it is a single slot as well