Tom's Hardware: Topic New Gaming Rig ~1200 budget
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Proximon
The amount of bandwidth limitation on a P45 board with two 4850s at 1680x1050 is not anything huge. Probably around 4 FPS in most games, compared to an x38, which in turn has similar FPS differences when compared to x48.
However, if you are over budget, you might be better served by grabbing a single 4870 and getting a good after market cooler for that CPU 
You'll get some pretty nice gains by overclocking, at a minor cost. Later, if you feel you are running out of GPU power you can add a second card.
Here is a quick tutorial on choosing various parts:
http://www.tomshardware.com/forum/ [...] rts-choose
And a list of some of my personal picks for builds:
http://www.tomshardware.com/forum/ [...] list-parts
Proximon and aeiouandxyz are correct. You're not using much bandwidth on that resolution anyway. I'd say a few frames. You will start to see quite a performance difference on 1900x1200 but not to that extreme, beyond 1900... thats when you wished you bought the X38/48 series.. 
just kidding, but it takes quite a hit as it relies heavily on the GPU to send data as much as possible.
Not sure of the 4850x2 pricing details, but that will outperform the 4870, if it costs more then go with the 4870. A 4870 on 1680x1050 is already an overkill.
The PSU is an overkill as well. I'm using 4850 crossfire OC'ed Q6600 @ 3.6, watercooling and 4 HDD, 2 optical, 1 sound - Corsair 620HX. My rig pulls 480watts.
You don't need the 1066 Ram as icyicy mentioned. I doubt you will be reaching that speed. a good 800 can be pushed beyond 400Mhz with better timings as well.
Message edited by Zecow on 11-11-2008 at 09:09:13 AM
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