Pulling my hair out.

Ok. Im never buying any microsoft crap again. I've had FSX for wahile, and ive been playin it with two gigs. But I still thought it was slow, so I bought a 4-gig ram stick and put it in my PC. Now when I boot up fs, and start flying, its not different at all from the 2 gigs I had. It actually makes it worse! Like after a minute of gameplay the textures get worse on the planes and the fs world, then over time they get even worse. If you guys have any solutions to this, or the texture problem, please comment! Thanks if you guys help me out of this rut.