Jetway 8800GT uses Samsung 1.0ns GDDR3 !!!

[alexio]

I don't get it? 1ns looser than 1.4? What am I missing?

1.0ns and 1.4ns stand for 1Hz (clock cycle) every 1.0 and 1.4 nano seconds repectively. 1MHz = 1 million Herz

Just taking away the same amount of zeros on both sides you can say that 1.0ns means the chips can do 1000MHz in one second; this is DDR2000. 1.4ns means it can do 1000MHz in 1.4s. 1000/1.4 = 714mhz aka DDR1429 (rounded correctly).

In plain language: 1.4ns chips are rated to run slower than 1.0ns chips. Because the chips are of the same design (just a different binning) the slower chips get tighter timing ratings from the manufacturer. It's just like with desktop RAM were companies sell DDR3-1333 at tighter timings than DDR3-1800.

The fact that the guy manages to overclock further with the tighter timings is rather special. It's very hard to explain really, but there are many things that could be causing this. One scenario (a pessimistic one) is that with the tigher timings more artifacts apair making the card start to correct itself (thus lowerring performance) while the viewer can't observe any artifacts. Another scenario is that the memory controller just handles the tighter timings better for whatever reason.

These things can only be explained by the people at Samsung that designed these chips or the people at Nvidia that designed the memory controller.

God I need another beer