Try the other v2 rasterizer. I was recently racing offline at Le Mans. With the D3Dv2 rasterizer, I couldn't complete a single lap without a screen freeze. It was such a bad screen freeze that I had to cut power to the PC. After the 2nd or 3rd time that happened, I found if I waited a minute or two the Task Manager would appear. Then I'd have to wait another minute or two for T Manager to shut down GPL. I switched to OGLv2 and I was able to qualify and run INT short races in all the GTs except the 910. In the 910 I got another screen freeze on the last lap of the race.
I've learned that bsarthe has bugs since I started racing online. It's strange though, that with my previous computer I may have run 20 or more, 28 lap races offline at bsarthe and never had a problem. I didn't know what a screen freeze was until I started racing online. I always used OGLv2 with a Nvidia 9500GT or GT220 video card on my previous computer.
I need to switch to OGLv2 with my present computer. I've continued to use D3Dv2 because I haven't been able to change the font size in pribluda with OGLv2. In OGLv2 pribluda hides the chat messages because of the larger font. One of these days I need to sit down and rearrange all the pribluda displays so I can see them and see chat too. Axel has always recommended that I use OGLv2 with my present video card, a Radeon HD7850. OGLv2 seems to give a better frame rate with my present card.
I doubt this info will help you Andreas but I thought Axel might find it interesting with the recent discussions about discos/screen freezes. Axel, from the specs Andreas mentioned I'd guess he's using a FX-4100? I've been looking for a bargain on a used FX-4100 so the the specs 4X3.6 Ghz are imprinted in my brain now.