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ATI 4890 its coming....

I thought it was supposed to have 20% to 30% gains over 4870? Doesn't sound like it:

PCI special interest group has certified compatibility of the yet-not-announced code-named ATI RV790 graphics processor with the PCI Express 2.0 bus. Such certification indirectly confirms that the graphics card currently known as the Radeon HD 4890 is about to be released commercially.

According to industrial sources with knowledge of the matter, the code-named ATI RV790 graphics processing unit is nothing else but the already shipping ATI RV770 chip with higher clock-speeds. The new processor can operate at higher frequencies since its design is slightly refined, certain erratums (which do not affect performance or stability of the RV770) are corrected and process technology adjustments are made.

ATI RV770/790 graphics processing units feature 800 stream processors, 40 texture units, 16 render back ends as well as 256-bit memory bus compatible with GDDR3, GDDR4 and GDDR5 memory types. The RV790 will feature higher clock-speeds, but not increased number of execution units.

Performance increases of the graphics card that is projected to be called ATI Radeon HD 4890 over the existing Radeon HD 4870 1GB should not be high as the difference between two products will be increases of clock-speeds. In case the graphics card designer decides to release ATI Radeon HD 4890 X2, performance gain should be modest as well.
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ScarySquirrel said:
Why is the 260 so good?
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Because it has similar performance to a 4870 for less money. It also uses less power, has better cooling, and overclocks better.

I estimate the pricing for the 4890 will launch at around £230 but fall to £200 after a few days when the big warehouse etailers acquire stock. It's success will depend on clock speed - 900MHz core and 4400MHz would allow it to compete with the GTX285. Any lower and it may be too close to bargain GTX260 216's to warrant the extra cash.
 
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