I really don't know what's going on here. Everything was fine yesterday, but today when I booted my PC and run the sim, FSX started acting up and frames drop now to 5 - 10 when turning, zooming or panning.I have this brand new GTX260 with the latest driver installed (197.45) and only reinstalling the driver seems to solve the problem, but as soon as the system is rebooted I get the same crap again.I run the driver installer as administrator and all. Also tried changing some settings in nHancer to rule out profile not being saved properly but no luck. The changes in the profile are visible in FSX but it's still sluggish.Windows doesn't show any change in my driver version after reinstalling it, but for some odd reason FSX runs silk smooth after that... until next reboot.This is diving me mad. Would very much appreciate any help.I'll try a previous revision of the driver and see if that helpsThanks :)

Get the 257.15 driver and try and add the following to the top of you fsx.cfg[bUFFERPOOL]PoolSize=80000000or for a performance increase try:[bUFFERPOOL]RejectThreshold=262144

Thanks for the suggestions Shane. I tried them but no joy :(Fitted the 5770 back in and it's doing the same thing, and it wasn't before so it's not a nVidia issue. I'm completely lost

If you have not tried it already I suggest you rename your FSX.cfg file and let Flight Simulator build a new one based on the hardware it detects. You will then have to edit it to put any "tweaks" back in. This has worked wonders for me in the past and I always do it when changing graphics cards.

Yeah I tried that too man, but it's still jerky as hell... untill I reinstall the driver. I've tested all sort of random stuff like reparing acceleration or reseting my bios settings to default, uninstalling nHancer, fresh driver install with driver sweeper, those are just some examples. It must be something I did this last few days but have no clue what it can be

Try this:http://forums1.avsim.net/index.php?showtop...t&p=1777383

Maybe some background operations use resources. Try GameBooster, it

I figured out what the culprit was in the end. After a complete reinstall of FSX + addons (yes, that took some time) I thought everything was ok. Then it started to happen again. The thing is that after each driver reinstall smart doctor prompted to install Gamer OSD to get full functionality. I never did, but then after the next reboot no more Gamer OSD pop up prompts and the same performance loss striking back again made me feel suspicious about it. Checked my program list and it was there... unistalled Gamer OSD and that was it.It's included in the card's CD package and it looks like an ancient version only suitable for vista & XP. I don't even know what it is supposed to do and I'm not sure I want to know anymore LOLThanks Bj

Talk about things that CAN go wrong...