|"I know it has a onboard, but its giving me a lot of issues which can't seem to be fixed."|
Describe the issues. They may have nothing to do with the onboard video adapter.
Your limiting factor regarding which video cards you can use, in addition to the low profile height requirement, is probably the total max (output) capacity of the power supply.
Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.
To find out what the power supply capacity is without opening the case....
Scroll down and look at the label.
Find the Product number - p/n - on your computer's label
Note the first part of it before #
Type that in the search box on that web page.
Scroll way down in the parts list to Power Supply.
Find it's wattage capacity.
I looked up one possible Compaq dc7600 Small Form Factor Product number and found:
(HP part number) 381024-001
Power supply (240-Watts) - 90–132/180–264VAC operational, 100–127/200–240VAC rated - With active power factor correction (PFC)
If you have the same capacity power supply, if you don't want to have to buy a power supply with more capacity, which will have to be an oddball small form factor power supply that fits in the case [search the web with the HP part number to find ones that will fit], I know from previous experience searching for one that there aren't many cards with video chipsets that can be used with a system that has a power supply capacity of less than about 250 watts.
For a PCI-E X 16 card,
- a card with a Geforce 7200GS video chipset will be fine with about a 250 watt PS (240 watts isn't much less), and there are lots of them on the web, some of which are low profile.
- or - a card with a Geforce 5200FX video chipset will be fine with about a 250 watt PS , if you can find one that is PCI-E X 16 and low profile.
- or - a card with a Radeon HD 4550 video chipset will be fine, if you can find one that is low profile - it's rated to use a minimum 300 watt power supply, but in reality users say it draws less power and causes no problem if you use it on a system that has about a 250 watt power supply.