The Tech Report heard the upcoming GeForce 8600 GTS and GeForce 8600 GT have both 32 stream processors:
That's a third as many as Nvidia's existing GeForce 8800 GTS and GeForce 8800 GTS 320MB cards, which both have 96 stream processors.
OCWorkbench also says the GeForce 8600 GTS will have a stock core clock speed of 675MHz as well as 256MB of GDDR3 memory, which will run at a stock speed of 1GHz and pump data through a 128-bit bus.
That said, the site claims that most retail cards will be overclocked to a core speed of 700MHz and a memory speed of 1.2GHz. The GeForce 8600 GTS will reportedly have maximum power draw of 71W, while the GeForce 8600 GT will only sip up to 43W.