Traditionally, identifications for different graphics cards based on the same chip are similar: ATI Radeon HD 4800 graphics cards based on the RV770 chip have 9440, 9441 (Radeon HD 4870 X2), 9442, 944C, 9443 (Radeon HD 4850 X2) device ids, whereas ATI Radeon HD 4800 boards powered by the RV790 chip carry 9460 and 9462 identifications. As it can be seen, the combination of the first three symbols in dev id describes the actual ASIC, whereas the fourth symbol describes the actual implementation (including speed-bin and/or the number of ASICs onboard).
Considering that ATI Radeon HD 5900 has “689x” identification, whereas the Radeon HD 5800 carries “688x” id, the actual ASICs should be different, unless AMD changes the identification scheme that has been used for many years.
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