GeForce GTS 150 is a high-end GPU based on the 2009, 55nm, first-generation unified architecture.
It's based on the G92 Core and offers 128 Shader Processing Units, 64 TMUs and 16 ROPs, on a 256-bit memory interface of standard DDR3. The central unit runs at 738MHz and the memory clock operates at up to 1000MHz.
It's therefore a renamed GeForce 9800 GTX+ with a lower memory clock - which will not affect its performance overall.
Today's modern demanding games are playable at medium (some high settings) but DirectX 11 games aren't supported and extremely demanding games will require reduced further reduced settings to be played optimally.