I would think 2 4850s would be enough for even a hardcore gamer.
2 4870s need a heck of a lot of cpu to keep up... (and psu)
I havn't actually checked, but I am pretty sure 1 4850 will surpass a 2x9600gt setup.
Well it all comes down to price, eye candy, and resolution. I like the 4850 CF option but 9600 GT will be cheaper and 9600 GT should use less power. But on the other hand it will be a good bit slower then 4850 CF.
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Lets just make it both the 9600GT SLI and 4850CF is good at what they do. Go with what money allows. If you can afford 2x4850's then, hek no question go for it, if you can't just stick with the second 9600GT.
Sorry I read your post a little more carefully, yes I think the best thing to do is sell the 9600GT (if you get a descent price for it), and buy a good P45 board, and 2 4850's, that should do it. Actually that is what I am planning, I have a 8800GTS 512, but I am thinking wether to sell it, or run 2 rigs, I could always sell it, I still have a 8800GTX sitting around.
4850s, reason - less performance hit when AA turned ON, @ 8X AA these cards r undoubtly fast.
Also remember U can CF on Intel chipset, so better stability and overclocking.
9600GT SLi performs similar to single 8800 Ultra, slightly faster than 8800GTS. If U r calculating performance/Watt then its worthy to buy second 9600GT and SLi. 9600GTs in SLi consume approx 110W, allmost similar to single 9800GTX+ under LOAD.
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