IL2 BoB - settings

[5AF_8FS_Doc]

I have a few questions for those of you who are running the sim smooth right now.

My system specs exceed or meet all of the posted system specs for the sim.

CPU:
EVGA 512-P3-N871-AR GeForce 9800 GTX+ 512MB 256-bit DDR3 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
GPU:
Intel Core 2 Duo E8400 Wolfdale 3.0GHz LGA 775 65W Dual-Core Processor BX80570E8400
Ram:
4 gigs of DDR2 ram

Now... I know that my video card only has 512 megs of memory... however, even at the lowest of low settings I cannot run the game smoothly... it is so jittery that it drives me nuts.

I have checked video card temps during gameplay and they are fine; also I have made sure that no AA or AF is turned on anywhere and it is fine.

Is it just my video card? Or is something else causing problems here? I have the epilepsy filter turned off btw.

Here are a few other problems I have noticed:
In the resolution area of the video settings i can only choose the following resolutions:
1680x1050, 1440x900 and 1280x800
Under windowed mode I can only choose three more:
1024x768
800x600
640x480
The sim crashes however under windowed mode.

S~ and thanks for any help you may have for me.