Here's my dilemma...I built a little while ago, a budget pc for around $700. I have a 4 gigs of ram, a x2 5400+ in a MB that supports crossfire, so I bought a 3870 for around $150. Now, as the 4800 series release is drawing nigh, I am wondering if I should just go ahead and buy another 3870 for another $150, or just wait until they come out and buy a new card. I will not go out and spend $300-500 on a new card, but I would like to perform a cost-effective bump up in the graphics department.
You could always get a 4850 an oc it a little. You wont run into scaling issues (as you would at some point with crossfire, particularly if your gaming at less than 1600x1200) and you could ebay the 3870. In like 6 months the 4850s will be alot cheaper and you could get a second one for that crossfire mobo. I wouldn't worry about your cpu, your gpu more or less is
your gaming performance as a golden rule of thumb, and ive seen a couple of benchmarks recently that back that up quite comprehensively.