All retail predators that I saw were on Hynix CFR or MFR. That's all 2133/2400/2666 and 2800 that I was testing. Most manufacturers are not releasing Samsung kits for about 2 years. Actually I haven't seen any Samsung based Kingston for a long time and if they had any series based on HCH9 then it was probably not in mass production.
The only memory that is still on Samsung HCH9 or HCK0 are TridentX but most kits look like 2x4GB = single sided, 2x8GB = double sided. 2400 C9 or 2600/2666 C10 kits are not available since late 2012.
You are pretty late for any 2x4GB double sided Samsung kits. I'm sure that ADATA, Avexir, Team Group, Kingston, Geil and Patriot have everything based on Hynix for over a year. 1600 Avexir Blitz are Elpida. Crucial has everything on Microns. Corsair has mainly Hynix, Micron, Nanya or anything else but I haven't seen any Samsungs for some time ( since they stopped to manufacture 2400 C9 kits so over a year ago ). Even their top lines like Dominator Platinum are on Hynix - 2666 CL12 etc. Latest 2133 Vengeance Pro were on Microns that couldn't even make 2200 clock.
I have HCH9 in Ripjaws 2133 that are running pretty good and like lower voltages than usual HCH9. Sadly these kits were replaced with Hynix but I think you still can find Rev. 1 of black RipjawsZ based on Samsung.
Other kits based on HCH9/HYK0 that can be still on stock in some stores are Team Group Xtreem 2400 9-11-11/10-12-12 ( new CL10 are Hynix ) and Vulcan ( Red ) 2400 10-11-11 ( Vulcan CL11 are Hynix ).
2x8GB kits are also good if you can live with 2133-2400 clock but tRFC will be higher. I was able to run TridentX 2x8GB 1866 at 2133 8-10-10 or 2400 9-10-10 what is impossible for most other kits. However I wasn't able to make 2600+ clocks regardless of used voltage or timings.
Some double sided MFR are also good if you want to keep clocks ~2800 C11. One of my Patriot MFR is running
@2600 10-12-12 1.70V but these are hard to get. Most new Hynix kits are running easier at 2800 C12 than 2600/2666 C11 and I don't think it will be any better soon as manufacturers are preparing for DDR4.
