Question regarding DX 11.

[Robert]

For whatever reason my card is running DX 11. Should I find a driver for my MSI/ATI Radeon 4850 that runs DX 10?

When I upgraded my system to 64bit Windows, I grabbed the latest 64 bit graphics driver for my MSI card (from MSI's site) and I wasn't aware that it was DX 11. I'm getting more pronounced stutters. I had them before but they were subtler instead of really dramatic like they are now with the alpha. Could DX 11 be the issue since the alpha clearly states DX 10.... or was that only to delineate between DX 9 and DX 10?

I'll probably do it anyway and report back. If it is an issue, I wonder how many others having problems with the Alpha running DX 11?

Thanks in advance.