You would loose a little but you will loose some any ways because trifire will have the pcie lane to 8x8x8 or 16x8x8 depending on mother board I do it and i would only recomend if you have the graphics cards> I would not spend any money on this set up. its fun but not really worth it =. most game coming out are not using Agea physx also there is a thread
here that shows the lost of some graphics with a hybrid physx card but gain alot on physx
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AMD Phenom II X6 1090T/CORSAIR H50
ASUS CROSSHAIR IV FORMULA
G.SKILL Flare 7-9-7-24 @2000mhz (4 x 2GB)
2-XFX 5850 1-285gtx PHYSX
Antec DF-85/AntecCP1000WATTS
WD X2 RAID 0 WITH WINDOWS 7 64/32