You clearly need a PCI card, not a PCI Express card, not an AGP card. If you get a picture of the card, the PCI connector is very clearly distinct from the AGP connector by not having two staggered rows of pins, and by having individual contact pins that are way smaller than ISA, also if you put a card on your table with the slot connector pointing towards you and the components visible, ISA cards will have the brackets on the right side, whereas PCI and AGP cards will have the bracket on the left side.

I will leave the final word on card recommendations to someone else, but Quake 2 and Half Life sound to me like a ATI Rage Pro or nVidia TNT2 might to the job just fine. It's not easy to find PCI versions of those cards at reasonable prices, though.

AGP slots are almost always coloured brown, PCI slots are white and ISA slots are black.

From what little info I can find (and I may be wrong), the Presario 5150's integrated graphics consist of an 8Mb S3 Savage4 AGP. Whilst that's not a particularly great graphics chip, with the correct drivers installed it should be perfectly up to the job of running games based on the Quake 2 engine.

sfryers wrote on 2025-01-23, 21:10:

From what little info I can find (and I may be wrong), the Presario 5150's integrated graphics consist of an 8Mb S3 Savage4 AGP.

The system I have has a ATI 3D RAGE LT PRO 2X. I appreciate the responses though and when I get the chance I'll be looking into getting the previously mentioned cards. I'm actually pretty cool with this computer otherwise aside from the case being a bit of a PITA to get around in.

If the integrated graphics is a Savage you are only having a driver issues. And Half-Life supports d3d.

What about the Radeon 9200SE:

https://www.youtube.com/watch?v=RxISYvdYGzU

there are PCI and AGP versions. Here's a PCI one for example:

https://www.ebay.co.uk/itm/375597822088

Interesting how Compaq released a PC with model number 5150.

Do you think they meant it as an homage?

I had a 5170 back in the day, with its built in Rage Pro LT it had no issues running the likes of Quake 2 and Half-Life.

I did upgrade it to a PCI Voodoo 3 3000 though for Q3A.

EXCITING UPDATE: I've been stupid and I got Quake 2 to boot into OpenGL! I had to install the right driver. Thank you for the advice.

Quake 2 will probably be too dark. The in-game brightness control is useless though. That is best left at the default setting.
Instead, increase the desktop gamma setting a bit in the ATI display properties before starting the game, then set it back to default after quitting.

There's a command line tool called Setgamma (https://celephais.net/fitzquake/) that does the same thing.