Hi i have an optereon 165 running at 2.9ghz with 2 gb of ram running 7800gt sli at 440/1100. I am considering upgrading to a single 8800gts 320mb. I game on a 19" lcd at 1280x1024. Will i see much improvement performance wise? Also do you think the 320mb is gonna be enough for games like crisis running at 1280x1024 without AA.