1866MHz RAM with i5-3320M (T430s)

[strider]

Hi,

Anybody uses 1866MHz RAM with i5-3320M CPU? (8gb per module)
What is the exact model # of RAM you use?
T430s, but ANY laptop model with this cpu is relevant.

I know there's also 2133 RAM, but its extremely rare and expensive.
Chipset Intel Panther Point QM77, North Bridge Intel Ivy Bridge-MB IMC.

BIOS unlocked/modified.

Any recommendation for ebay seller or other place that is known to sell genuine RAM?
I had RAM from China, that was clearly fake (didn't support even 1600 MHz).
Or a hint how to notice a fake RAM?
Thank you!

[RealBlackStuff]

xx30 Series uses PC3-12800 / DDR3-1600MHz RAM.
Anything faster just might work, but is not guaranteed.

[strider]

xx30 Series uses PC3-12800 / DDR3-1600MHz RAM.
Anything faster just might work, but is not guaranteed.

Yes, but this is official info.
I've seen many reports of people using even 2133.