The table below shows an 'apples to apples' comparison between the HD7750, HD7770 and HD7790 graphics cards currently available from AMD:



The new core compares favourably against it's siblings by having a 25% increase in transistor count over both the HD7750 and HD7770 along with a 256 increase in stream processors over the HD7770. The result is a near 40% increase in compute performance (1.28 TFLOPS vs 1.78 TFLOPS). Memory clockspeed also sees a boost from 4.5Gbps to 6Gbps. All of this extra power will only cost you an extra 5w with the HD7790 typically consuming just 85W.

On paper at least there have been some significant improvements not least with the price which for all the enhancements this card provides, AMD expects its board partners to retail the card at a touch under £100 mark, matching the current price of the HD7770 so expect to see some cuts to the lower end of the family.



The AMD HD7790 continues to be based upon the GCN (Graphics Core Next) architecture which in this case comprises of twin geometry and tessellation engines. The 14 GCN units make up a count of 896 Stream Processors with 16 render output units.



Another improvement is a 100% increase in the levels of DPM from 4 to 8. The 8 clock/voltage DPM pairings allow for higher engine clock speeds while maintaining optimum voltage levels.

Let's move on to the features of the HD7790...