mostly for manual tunning
running at 4266mhz is hard to do if not impossible unless you have the right motherboard.however these are good bdie and do 3866mhz with ease at 16-17-17-35 1.41v.they even have temp sensors so you can see how much voltage you can run into them.
so unless you have a really high end motherboard expect to do a lot of manual tunning.even on a really high end motherboards since you are buying 2 seperate kits of 2x8gb a high speed such as 4266mhz is not guaranteed.
Verified purchase: YesCondition: Pre-owned