Thanks Dev. I realize its the x38 chipset and thats why I was asking since I didnt see any mention from dell of it specifically supporting the technology.

i guess i can always try and see what happens,but im hoping someone has some first hand experience.

I don't think it officially does, but the system has the Intel X38 chipset with 2 x PCIe 16x slots (16 lanes each) (see user's guide here)

<ADMIN NOTE: Broken link has been removed from this post by Dell>

 On other (non-Dell) motherboards X38 chipsets have supported Crossfire (e.g. Asus P5E, so I'd think it's possible here too.

yes i also want to know if someone tried it
i found this video on youtube but some people says that this machine is not t3400
check it out
http://www.youtube.com/watch?v=3aE-U3Bsz7s

Although two Nvidia 8800GTX would offer the best performance, the X38 does not support SLI. Currently, only AMD/ATI can take advantage of dual-card operation on X38-based boards.

http://www.tomshardware.com/reviews/intel-x38-chipset,1694-2.html

http://www.dell.com/downloads/global/products/precn/en/precn_t3400_specsheet.pdf

I have seen the pdf sheet of t3400.....didn't get your point. You mean to say that t3400 can support crossfire not SLI?