3870 x2. It handless the next good, but how about the classics?

So, as you may know, I had problems with Quake 3 on a 8800GT. After uncountable tests, I RMA'd it. Recieved it back, and the same freeze happened. Now I have the opportunity to RMA it again and change to another card on the shop's stock. I decided to get a 3870 x2, since it is the best on the market atm and its ATi (I don't trust anymore nvidia's drivers regarding old OpenGL games). Thread here: http://www.tomshardware.co.uk/foru [...] es-nvoglnt

The problem is I have 3 days ONLY to decide what im going to get. So basically, I need a confirmation that I will not get ANY kind of problem when playing Quake 3 on a 3870 x2. So PLEASE, anyone with the card, test Quake 3 for a couple of hours in a row to confirm ATi is not failing the same way nVidia does.

Remember, I enjoy playing Crysis at very high, but not if the price is lossing the great classics.

Thanks.

Problems started with the 8xxx series. And I ask because the multi GPU idea of the 3870x2 scares me a bit for the old games like Quake 3.

I've heard there where problems when using only one card because of the Crossfire thing. Can you manually set Crossfire off so you only get one card to avoid weird **** with old games?