I have a Dell Optiplex gx620 Slimline and want to upgrade my video card. I have already tried a Gigabyte HD 4550, but the sub vga 15 pin adapter sticks up above my computer. I don't need this adapter as I want to use the HDMI. I use my TV for a monitor. I am running Windows 7 and have 4 gb of ram. I also tried a Raedon HD 4670 and it is twice the size of my tower! Anyway, any help would be appreciated. Thank you!