video card trouble

I need to upgrade my video card. I've been looking at the HIS radeon HD 3850 PCIE, but am not sure if it will fit my computer. I have a Dell Dimension C521, small, slim...

I currently have a ATI Radeon 1300Pro, it sucks. Any suggestions or information on what i need to look for to fit this computer?

The problem here is with that case. You will only be able to use a "half-height" videocard and right now there aren't that many. You can probably get something like an 8600GT, but anything better than that may not exist.....yet.

You might see words like "low profile" and "half-height" cards and they might mean the same thing, but I have a feeling they are different.

You might wanna try PC Hardware Discussion for better results.