What is the best graphics card without having a bottleneck?

i have a dell optiplex gx620 p4 3.2ghz with 2gb of ddr2 ram and have 1 pcie X16 slot. I would like to upgrade my graphics card but i have no idea what card to buy. I would like to get a card that can play the orange box etc on highest and play some of the newer games as well on as high graphics as possible (new games i mean like CoD 4, Crysis, bioshock etc). I'm not sure about my psu and it's specs but it was what came with the dell so should be stock. thanks in advance!

i'm not all that clued up when it comes to specifications of some parts of the computer so be patient but what's wrong with my cpu? It's a pentium 4 processor that is capable of hyperthreading.... not sure about the psu though. If this psu is really that bad i've got another one which is over 400W that i could replace it with

HD4670 (or 4650) would be a good choice, it uses so little power it doesn't need any extra pcie-power connectors and should still run those games (except crysis) at decent frames, maybe not maxed but with some eye-candy. And your cpu shouldn't hold it back too much to be noticeable...

I think gamerk316 went bit too extreme on the cpu bottlenecking, your cpu is old and outdated yes, but it ain't that bad

Your cpu is like 4 years old, thats a lifetime in computer hardware.
I'd upgrade both cpu and gpu if I were you. Crysis on Pentium 4 is close to impossible.

I'd get something like 4850 depending on budget and the E5200 intel cpu(make sure you actually have a LGA 775 socket of course) and overclock the cpu.

Btw. you can't spell hyperthreading without hype.

Depends on the PSU. Dell PSUs are quite good.

Crysis will work on a CRT...

Your PSU is junk, and so is your CPU. Your system FSB is slooooooooooooow.

A simple way to find out what you can do is to look at your psu specs. They should be on a label on the unit. Look for the 12v+ amp rating. Also look for how many pci-e 6 pin connectors it has.
If there are none, a card like the 4670 is about as good as you can do, powered only by the pci-e slot.
If there is one 6-pin connector, you could probably use a 4850.

Any card will do much better than integrated graphics. I assume you have no card now.
A P4 @3.2 should run any of the above just fine.
If a game is particularly demanding like crysis, you can turn off some of the eye candy, or run it at a lower resolution.

A cheap performance upgrade is to increase ram to 3 or 4 gb.

4670 would be the way to go. You can play crysis at med settings.