1866 MHz RAM for Sandy Bridge

Here is the news and review of the Kingston HyperX 1866 MHz set:
Kingston HyperX 8GB 1866MHz SO-DIMM Memory Kit For Notebooks - Sandy Bridge Notebooks Get HyperX Treatment - Legit Reviews

Seems like Kingston have made 1866 MHz RAM targeted for notebooks. SB i5/7s can only support up to 1666 RAM according to Intel specs, but legitreview says this:
"JEDEC board recently released JEDEC-compliant settings allowing for 1600MHz and 1866MHz frequency support on these platforms. The Intel 'Sandy Bridge' mobile processor family can easily support these faster memory speeds"

What does that mean? Does it mean we can use 1866 RAM on our SB notebooks? I was especially impressed by this graph. Don`t know if it is 6 vs 8GB RAM that does it, or it is the speed of the RAM though. Anyone who know?

 

How are they testing the IGP? They are using the same notebook except switching the RAM? And it was dual channel on both? 2+4 for 1333 and 4+4 for 1866

 

I am just asking here but, i thought the golden rule of dual channel memory was to get the same speed and latency on both modules. Different size on the sticks does not impact performance. I could be wrong though.

Why does it matter if it have IGP? Or GPU for that matter? The point was to test two identical systems, and only switch out the same hardware so you know how much performance the hardware gives. If you had lets say a notebook with AMD 6970M, the differences to this test would be like 3x the FPS on both results but the same differences between 1333 and 1866. No?

Maybe i am just tired but i don`t quite see what you mean

 

Aha i see. So you will see a much smaller difference in memory performance if you tested it with a GPU?
I agree on the HyperX vs the cheap RAM. But not everyone have HyperX in their notebook anyways.

 

Going from 1600 to 1866 would help the IGP a bit.

They are mostly mem bandwidth limited