I don't know about that, Nick. I got a 3650 256MB card, 3GB of RAM and a slightly slower CPU than the OP and I'm fine -- with all sliders (except visibility distance and mips) full right in the sim and with the card maxed out for quality. I always have my AI set to 100%. That's over 600 airlines and GA. Hundreds of addons too... I get a solid 25fps most of the time and no blurries.
I think that the OP's problem is something else. Bad texture somewhere? Too many processes going on in the background?
"Any man who would do less, is less than a man."
Richard Libertini as Giuseppe, in Unfaithfully Yours (1984).