Quote Originally Posted by Luka_Aveiro View Post

This is the other side of my thinkings, guess I'll need more facts to convince me

BTW, wasn't HD4870 supposed to be 800mhz core clock???
its 750 - i don't have the link to the slides anymore, but if it is 1.2 TFp then 750 x 800 x 2 = 1.2 TFp exactly.

Also, GDDR5 does work differently:

Bandwidth first: A system using GDDR3 memory on a 256-bit memory bus running at 1800MHz (effective DDR speed) would deliver 57.6 GB per second. Think of a GeForce 9600GT, for example. The same speed GDDR5 on the same bus would deliver 115.2 GB per second, or twice that amount. Take any GDDR3 bandwidth on a given clock rate and bus width and double it, and you get GDDR5's bandwidth. Of course, the marketing guys love big numbers and would undoubtedly not call it 1800MHz, just as 1800MHz GDDR3 is really running at 900MHz. Expect the marketing guys to call memory at that speed 3200MHz.
The rest of it you can read here:

http://www.extremetech.com/article2/...2309888,00.asp

From the sound of it, it IS indeed seen as 900 MHz and for GDDR3 it would just be 1800 MHz effective, but GDDR5 doubles that to 3600 MHz effective.