Amen to that, 'Reaper....you really, really don't want one. An even BIGGER problem with all-in-ones is that the graphics chip shares memory with the system and that slows things to a crawl. You'll never get the full potential of the CPU or the graphics core, no matter how good either one of them may be.
My oldest daughter's system is a Celery 466 with an all-in-one mobo (PC-Chips 748LMRT....yes, I know it's garbage) and my 3 year-old has a K6-2 366 (nudged). Anyhoo, I can plop an S3 ViRGE on the 366--not a ViRGE GX or DX, but the original, slug-slow ViRGE 325--and it will STILL outrun the 466 on any D3D software.
Bottom line: All-in-one boards slow everything to a crawl. If you bought a cheep video card on a basic motherboard you'd be much better off.