I have an x99 board with 8x4g ddr4, the problem is that windows load's very slowly. Sometimes bios won't recognize all 8 sticks, sometimes only 6 sticks and maybe once it saw 7. This morning I went about a more methodic approach to testing my ram, if not very thorough. I got a system down to where I had uefi defaults loaded, and tested each stick one at a time in slot A1 with the only parameters of whether or not it posted and if windows 10 took a long time to load. Each stick passed this test individually so I decided to go straight to all 8 (with each kit in slot's ABCD 1 and 2 respectively) and windows loads very slowly. So something along the way is not happy. I am guessing either one individual stick is not happy or the memory controller on the cpu can't handle everything. I am going to be more thorough in my testing IE: trying each set of 4 in the 1 slot, test each stick individually multiple times, dual channel, triple channel etc. But I figured during this time I would ask for some advice and thoughts. Memtest hasn't seen a single fault in the 8+hrs total that I have run it on all 8 sticks. Realbench can pass 8 hours no problem considering I don't have the cpu pushing further than it's happy. I know something is wrong and I need to figure it out sooner rather than later so I can return to microcenter and only do it once, if I know exactly what part is flawed I won't have to go back a second time. Ideas?