Originally Posted by Gdourado
Which models are the ones with 100 base clock?
He's referring to the 3200 MHz (or 2666) running on the standard 100 BCLK. The 2800 and 3000 speeds sometimes need the 125 strap to gain more stability, although that does not mean it isn't possible at 100. Typically, you lose your ability to run adaptive voltage at the 125 strap and it can have repercussions if you have a lot PCI-E devices in use. Chances are the 3000 kit will overclock further to 3200 and of course the 3200 kit can be run at 3000, 2666, or anything else. If you are someone who hates to even touch the BIOS, then picking a specific XMP setting that you know you will run is more important. For anyone else, you can always change the four primary timings, DRAM voltage, and let the board choose the rest. The kit with the lowest latency (C15, C14, C16) at the highest speed likely has the greatest potential.
Most kits need to go up a C-latency level (15 -> 16) for going up one speed (3000 to 3200) or go down one level for each standard frequency dropped. So a C15 kit at 3200 can probably run C14@3000, C13@2800, C12@2666, etc. This is a generalization and you never know what you can do until you get the kit installed and try. Originally, frequency trumped latency on DDR4. C15-3200 is faster than C14-3000. However, the gap seems to be shrinking, as it eventually always does. On the newer 3000 series Asus BIOS, the gap between C12-2666 and C15-3200 has become almost non-existent. Hours and hours of tuning might be able to eek out a slightly larger gap, but I am not memory bandwidth limited so I don't pursue it. You may need to ask the same question of yourself. If the money doesn't matter, take the C15-3200 kit. Is it worth 35 Euros more than 3200C16 kit? Only if you need every bit of memory bandwidth or are looking forward to doing some memory overclocking.