Radeon HD 2400 XT is an entry-level GPU based on the 65nm variant of the second unified shader architecture, R600.
It's based on the RV610 Core and offers 40 Shader Processing Units, 4 TMUs and 4 ROPs a 64-bit memory interface of standard GDDR3. The central unit runs at 650MHz and the memory clock runs at up to 500MHz. It's therefore a higher clocked Radeon HD 2400 Pro, paired with GDDR3 and should be considerably faster.
Today's games only playable at unattractive resolutions and using low (likely) or medium (maybe) presets. DirectX 11 games aren't supported.