dsdt is kinda a PITA unless you know your hardware in and out, but is the absolute best way to achieve hardware injection, and if you can do it, then DO IT. you will not regret it.

if not... try an injector, such as silent natit_64. (its both x32 and x64, dont worry) . thats how i got my old 7950GT 512MB recognized and fully operational under 10.6.3. (but have since upgraded to a GT240 (though downgraded in OSX openGL performance seems to work better... plus the 7950 blew up cuz i had it overclocked to the moon in windows).
maybe NVInject will work for you.

if you want to stay away from injectors (as they get modified every update and you have to reinstall them) use EFI studio. i believe it has a string for your card. (cant check now because im on my ancient iBook G3 while windows 7 is installing on my hack... osx drive unplugged, of course,)

but if you want to try the DSDT, check out this link. http://www.google.com/search?hl=en&c...&aqi=&aql=&oq=

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Hack Pro:
AMD Athlon 64 Dual-Core X2 5600+ 2.8GHz
Asus M2N-SLI Deluxe Motherboard
8GB ram (4x2GB DDR2-800)
XFX Geforce GT240 1GB DDR5
500GB SATA HD (Snow Leopard 10.6.6)
250GB SATA HD (Windows 7 64bit)