Quote Originally Posted by Glow9 View Post
Curious maybe someone can explain but why does the ATI card only have 256-bit memory interface, It has a bit more ram than the GTX yet the GTX has 448-bit memory interface?
To be precise;
HD4870 has eight GDDR5 chips each 1Gbits (128MB) in capacity yielding total of 8×128MB=1GB and since each chip has a bus width of 32bits the whole bus combined is 8×32bit=256bit.
GTX260 has 14 GDDR3 chips, each 512Mbits (64MB) totalling 14×64MB=896MB, total bus is 14×32bit=448bit. GTX280 has 16 chips and as such for the calculations: 14->16.

Quote Originally Posted by kemo View Post
Were do you guys read that 6% faster clock per clock
that means that RV790 is 6% faster than RV770 ,, 850Mhz vs 750Mhz , it could even be 6% from 4870 to 4890
It's not wise to believe everything you read. Fact is the 13% frequency increase alone will gain 13% more in performance.

And come on, would it make sense producing a different silicon for mere 6% total performance increase. They could have cherrypicked age-old RV770s to get even more than 6%, cheaper and with less of a hassle.