Photos and more details on AMD 4800 series
 

Radeon HD 4870 core and memory clock frequencies have not yet confirmed, is most curious about the outside world is carrying Qimonda production GDDR5 memory Qimonda as the first GDDR5 graphics memory of AMD AMD / ATI Radeon HD 4800 Series Adoption of a single standard for 16 Mx32, with 256 bit 512MB capacity, the third party also said that although this card is the first allocation of GDDR5 memory card, although the related impact on manufacturing costs, but it is not difficult to see AMD in developing products Gall of the former, as overclocking and performance remains to be seen, Radeon HD 4870 Dual-Slot used air-cooled radiators, the two groups to be 6 - PIN card power, for electricity, AMD recommend the use of more than 500 W power supply , To provide double-Dual-Link DVI video interface, Radeon display driver 8.49 version drivers support the first time, after the 8.501 version is available Windows XP, VISTA test, AMD Radeon HD 4870 is expected at US $ 329! (€208)


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Will the HD4870 be a better product then the 8800GTS 512MB, considering its price?

4870 is gunning for performance higher than 9800 GTX; the 4850 is rumored to be competition for 9800GTX

Only 256bit memory interface... a bit strange when you go for DDR5 as a memory technology.

I don't see how, Ringbus tech for lower latency, and higher memory speed to improve performance over DDR4. A 512bit bus might result in huge memory bandwidth but I don't think it is really needed, core clocks will probable pay off lots more. The 512bit bus is harder to develop too, maybe next time?

You can either use a higher bit memory interface, or increase the RAM frequency as both will raise the total memory bandwidth. I suspect this was done primarily for better cost savings, cheaper to pay for DDR5 rather than 512bit silicon+PCB design. ;)

HD 4870 512mb is supposed to be 20% better than the 9800GTX. All things considered 20% sounds reasonable.

GTX280 to be 50% faster than 9800GTX; also rumored... even if it's lower than expected, might be faster than 4780

I would expect GT 280 to be faster. However it looks like 4870 will be almost half the MSRP of GT 280...