ATI’s CrossFire multi-GPU technology. However, the X1650 XT uses GDDR3 instead of the newer GDDR4 memory and has half the pixel shader processors of the X1950 PRO. There’s also no support for DirectX 10 yet, though at this price point, I’m not really sure it would make or break my decision to pick one up. Plus, if you haven’t updated your desktop to PCI Express yet, there’s an AGP version.

EDIT: ExtremeTech and AnandTech have reviews up of the new card and, well, the X1650 XT disappointed both sites coming in a close second against its main competition, Nvidia’s 7600 GT.
ATI Radeon X1650 XT [product page]