I am looking to add a DX10 card to my Dell 745 small form factor system, but cannot seem to find cards with size descriptions (2.4in high and the depth is 6.7in) so it will fit in my system.

Everyone seems to recommend an 8800GT, but can I get one to fit my machine?

thanks

First of all.... find out your PSUs power output.

Im expecting 300W or less...

Which means a HD3450 at the very best.

You shouldve considered all this before making your decision to buy slimline / standard sized... Now I fear you're stuck with an expensive slimline PC with very little upgradeability.

I totally agree, the machine was given to me, and I am just trying to maximize it's performance...I think the PSU is a 275, 0r 300W

if it was given then thats not too bad but there'll be little you can do with a small PSU... Its the biggest limiting factor about them slimline machines.