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2x8GB or 4x4GB DDR4 kit for Ranger?

yamatosan
Level 8
I forgot the basic rule of researching/thinking before buying and I've made a mess.
When I bought my components for my new rig back in december 2015 I did not think about memory too much.
I bought the best priced and high frequency money can buy at that moment, a 2x4GB kit : HyperX HX426C15FBK2/8
I was thinking that I will get later on a similar kit and upgrade to 16GB, but I remember later on "meat and potato" rule:
"DO NOT USE ONE KIT OF MEMORY OF 2x4GB (MY CASE) TO HAVE 8GB, THINKING LATER ON I WILL GET AN IDENTICAL KIT OF MEMORY AND HAVE A TOTAL OF 16GB, ESPECIALLY IF YOU PLAN TO OVERCLOCK. INSTEAD USE ONE BIG KIT OF 16GB, EITHER 2X8GB DUAL CHANNEL OR 4X4GB QUAD CHANNEL, BUT MAKE SURE THAT THEY ARE INTENTED FOR YOUR PLATFORM (Z170 IN MY CASE) !!!."
I manage to get 2 identical kits to work together, made tests and no errors appear with HCI & Memtest, but they are stable only at stock speed of 2133MHz. I'm sure that someone can spend a lot of time to tweak 2 identical kits to work together and maybe succeed, but I do not plan to do that.

So now i need to sent back 1kit of 2x4GB and get a new kit of 16GB.
My options for 2x8GB kit are following:
1. Corsair Vengeance LPX Red CMK16GX4M2B3000C15R with 15-17-17-35@1.35V
2. Kingston HyperX Savage Black HX430C15SB2K2/16 with 15-17-17-??@1.35V

My options for 4x4GB kit are following:
3. Corsair Vengeance LPX Black CMK16GX4M4B3000C15 with 15-17-17-35@1.35V
4. Kingston HyperX Savage Black HX430C15SBK4/16 with 15-17-17-??@1.35V


CMK16GX4M4B3000C15 (4x4GB kit) is the only one in QVL list.
Let me know what should I buy.
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Chino
Level 15