okay so with the current settings you could actually get away with the GeForce G210 Low Profile conversion card. It comes with the low profile adapters and everything. I just actually put one into my dc7700 along with a RAM upgrade (just for gaming reasons) XD. The only problem that you will run into is the same as anyone who has put a graphics card into their dc7700, no audio with CRT.... x.x Don't panic yet...all is well! I searched for answers on how to get it to work with the onboard media card but couldn't find anything.... so I've actually created a thread that has the answer to it,
No sound on HP dc7700
hope its not too late for you!!!