Which is better?

I'd say the HD4850 is better both price and performance wise.

Remember the golden rule in the SLI/Crossfire world: 1 + 1 = 1.5

:D
 
Well there are pros and cons to SLi.
You would probably get better performance with 2 8800GT's in SLI, but you would not be able to use dual monitors. You would also be taking up twice as many slots. What about saving and waiting for the 4870x2?
 
they 4850 is $100 cheaper

4850 is not $100 cheaper, it just around $30 cheaper.

Furthermore, Nvidia released 9800GTX+ which does compete very well with HD4850. Also, it has dual-slot cooler, which mean that it produce much less heat.
 
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