Adding memory with different module types

aca85

Distinguished
Nov 8, 2009
6
0
18,520
I have 2x4GB Kingston HyperX 1866Mhz (model is KHX1866C10D3/4G).
Now i want to buy 2 more memory sticks (same 2x4GB Kingston Hyper X) so that i have 4x4Gb in total.
Problem is, the model i have is old, 3years, and i can't find it anywhere on the market.
Kingston updated it with a newer model (HX318C9SR/4) but I'm not very knowledgeable so i don't really understand if they're compatible.

In short, is the Kingston Hyper X model KHX1866C10D3/4G fully (without any issue or performance loss) compatible with the newer model HX318C9SR/4 ???

Here are links to Kingston datasheets regarding there two models.
http://www.kingston.com/datasheets/KHX1866C9D3_4G.pdf
http://www.kingston.com/datasheets/HX318C9SR_4.pdf

Tnx for any help and/or advice.