Many, many thanks to L, B6 and all in the dev.team
For me it ROCKS!
I had previously, before the new beta-patch today, fps varying between 15-40 at the best with fullscreen 1920 x 1200, 60Hz. Had then detail on high, buildings at medium, forest at medium, shadows on. Slower fps near ground and downtown. CTDs now and then, quite often.
I now today have 1) changed in my conf.ini from dx9 to dx10 + installed the patch + deleted the cache-files, nothing else.
Well I had to reinstall my axes in the controlsection for: rudder, mixture, proppitch and radiator because the old settings did not work. (I have them on my rudderpedals + on a CH throttlequadrant).
I test to fly for about 20 minutes the quick singlemission in a Spit over London. No crashes to desktop, have not checked the new fps but was smooth as a dream.
So I went to the Video Options and MAXED EVERYTHING there (anti-EP filter not checked).
Then I went back to the same Spitfire alone over London. 30 minutes without CTD, no stuttering. Could not check the actual fps today (forgot how to do it), but it still runs supersmoothly for my old Mk1-eyeballs, in the cockpit and in the outside views. I reckon it will be another story when doghfighting/flying amongst other aircrafts. But it will surely still be beautiful (even if I have to lower something in Video Options at that time) compared to what I had before. I am a very happy WWII-airplanelover at the moment.
Best Regards from a man still learning how to fly this thing and having no combat experience what so ever
MY PC: MSI motherboard. AMD Phenomen(tm)II x6 1100T processor, 3,3 GHz. I have two AMD Radeon HD 6900grafic cards with cross-fire. 16 GB installed memory. I have Windows 7 Ultimate, 64 bit. The game is installed in the standard way on my C-drive. My screen is a Samsung syncmaster with max resolution 1920 x 1200, 60 Hz. I use TM Hotas Warthog (mapped ingame for buttons and axes), Saitec Pro Combat rudderpedals and a Logitech G19 keyboard. Track IR 5 pro.
I have the latest driver for my graphics card says the program/computor when I tried to update the driver (Advanced Micro Devices, Inc, date 2012-03-08, version: 8.951.0.0).