Radeon X1950 GT is a high-end GPU based on the 80nm variant of the R500 architecture.
It's based on the R570 Core and offers 36 Pixel Shaders, 12 TMUs and 12 ROPs, on a 256-bit of standard GDDR3. The central unit runs at 500MHz and the memory clock operates at up to 600MHz.
Its therefore a slightly underclocked Radeon X1900 GT which should perform slightly wosr while heating less, thanks to the smaller technology.
Most of today's games might be playable at medium settings although the low preset will have to suffice on some. As it's not based on a Shader-Unified architecture, both DirectX 10 & 11 games aren't supported.