http://www.ati.com/technology/crossfire/physics/index.htmlthere it is then, there are two way's of do'n
a 1+1 sollution so your X1900 XTX does the Ggraphics and the second X1900 XTX does the Physics
and there is a nice 2+1 sollution, then you have a X1900 XTX = X1900 CFE card in CrossFire and a X1900XTX as Physics Processing Unit.
You can also take an ATi X1300 series, X1600 series & X1800 series card as well, a X1K series card is a must to support the Physics feature.
What a great way to PWN Quad SLI CrossFire + max Physics where an Ageia card could dream of, an X1600XT for example does about 2 the Physics calculations of the Ageia PPU card, so imange what an X1800 or X1900 series card would do
My plans are buy the R600 as Graphics card and use my exsisting X1900 XTX as PPU
that is in theorie faster than a normal CrossFire Setup, the CPU can be used for other stuff.
Ati also got the Best Inovation Award from Hexus
http://www.hexus.net/content/item.php?item=5989&page=3So congratulations to ATI, winning the Best Innovation Award for Havok FX on Crossfire. for the new stuff ATi all the way
ah here a sneek peek of the Ati Radeon X1950 XTX:
it has 512MB GDDR4 @ 2Ghz and Core @ 650 Mhz like X1900 XTX, it's adavantage is the faster GDDR4 and much scilenter and better cooling system.
this card can be used as PPU also and your remaining X1K card as GFX, but the wisest thing would be that you'd use your fasted ATi card as PPU and a card like the X1950 XTX as main GFX card.
I would use the X1950 for GFX and X1900 XTX for PPU.