This article is from yesterday, not from 5 months ago, and yesterday, HD 5000 support was there and it worked.

There are a couple of games which won't work (ET:QW, for example, Amnesia, Quake4 and some others), most other things should work.

If my 4550 can handle Doom3 just fine, then the 5450 should be able to do so too.

So, for most people, doing normal things that normal people do, the OSS drivers ARE an option.