Radeon X1800 GTO is a fast-middle-class GPU based on the 90nm variant of the R500 architecture.
It's based on the R520 Core and offers 12 Pixel Shaders, 12 TMUs and 8 ROPs, on a 256-bit of standard GDDR3. The central unit runs at 500MHz and the memory clock operates at up to 495MHz.
Its performance is relatively better than previous GPUs in series but not much better than Radeon X1650 despite the 256-bit bus width.
Some of today's games might be playable at medium settings although the low preset will have to be used on most. As it's not based on a Shader-Unified architecture, both DirectX 10 & 11 games aren't supported.