No one is going to pair a GTX480 with 720? Sure you will when you buy a GTX560/Radeon 6850 in 2 years and pair it with that 720 you purchased now to save the $50. Eventually you will need to upgrade your 5850...
In the short term yes it is better to pair a faster GPU with a slower CPU. But in 2 years when the 5850 and 5770 are both slow and you want a new generation card, Core i5 750 overclocked to 4.0ghz will have no problems keeping up while your
720BE will need upgrading AGAIN.....Sometimes it makes sense to spend an extra $50 on a CPU upfront.
In my honest opinion, our videocard forum has FAR downplayed the importance of CPU dependence. I mean you name any game, and it runs like a dog on Core 2 Duo 2.4ghz (E6600) and even E8400:
http://www.pcgameshardware.com/aid,...System-Requirements-and-Screenshots/Practice/ Yet, every week you see someone recommending a GTX480 to be paired with a C2D.
I mean
a stock Core i7 920 gets higher minimum framerates in Prototype at 1680x1050 4AA than an E8400 gets on average...You can tell me all you want that you can shift the GPU bottleneck by applying 16AA. I don't want 16AA. I want 40fps minimums and an average near 60 fps at 1920x1080. If I wanted 30 fps, I would have purchased a console. You can also throw a GTX480 in there but all you are going to get is 'free' AA. You are still not breaking 30 fps with a slow CPU. So what would you take 60 fps avg / 40 min 1920x1080 0AA or 30 fps / 20 min 16xAA 1920x1080?
How many people with E6600/E6700/E8400/E8500 are upgrading now? Tons. Instead, they could have purchased Q6600 up front 2 years ago and would have easily survived with it until Sandy Bridge. The extra cost was only $100 between the processors i listed and the Q6600 (sometimes $50). Their argument was similar to yours that why spend extra $50 today for performance difference they couldn't tell between a C2D and C2Q 2 years ago. Hindsight 20/20, this strategy was obviously a less cost effective decision as a Q6600 @ 3.4ghz will mop the floor with any Core 2 Duo in today's games.
OP, you can get the Athlon X4 630 for $99 + Free mobo (if you have a Microcenter) and an $85 4850 1GB (Newegg). That would be a major upgrade for not much $$$.