DirectX 10 downgrade to DirectX 9

[kimsland]

You know this same question seems to pop up a lot, usually with the Sims.
"Vertical Refresh to Always off" does that downgrade the performance, or does it just make everything OK ? ie is that the answer, to anyone who posts?

 

[martindeck]

I don't know but when a graphical corruption occurs, I set vsync to off, and everything goes back to normal. And when another corruption occurs, I set vsync on again, and everything goes back to normal. Regarding performance, it doens't affect anything at all, except for the corruption.