The GPU used is labelled G84-300. The GPU clock runs at 540MHz and GDDR3 at 1400MHz. G84 does not support HDCP. There is another version G84-305 comes with HDCP support.
The 8600GT is supposed to take over the mainstream market of the 7600GT and 7600GS from May 2007. There will be 128M and 256MB versions of the 8600GT cards. Both cards will support GDDR3 128bits, HDTV and HDCP.
The card looks like the normal 7600GT. THere is no 6 pin aux power connector. There is two DVI-I and a SLI connector Slot on top.
The 8600GT and 8500GT will be announced on the same day but will be on sale from 1st may 2007.

Pricing of 8600GTS is around $200-250
8600GT is around $150-180
8500GT is around $90









The GPU used is labelled G84-400. The GPU clock runs at 675MHz and GDDR3 at 2000MHz. The card is HDCP Ready.
The DX10 card, 8600GTS is supposed to take over the performance market of the 7900GS and 7950GT. from 17 Apr 2007. There will be 256MB and 512MB versions of the 8600GTS cards. Both cards will support GDDR3 or GDDR4 128bits and comes with HDTV and HDCP.
The card is slightly longer than the 8600GT. It also comes with a 6 pin power connector. There are two DVI-I and a SLI connector Slot on top.
The 8600GTS will be announced and available from 17 Apr.
Pricing of 8600GTS is around $200-250
8600GT is around $150-180
8500GT is around $90


Fonte: OCWorkbench