Nike_7688While a lot of us can run 3600MHz on gear 1 no problem (a few can run 3733 even), there have been a few that have reported no such luck. There's definitely a memory lottery system and it seems to require that you win 3 times. Your CPU (the IMC anyway), the motherboard, and the memory you pick all have to, for lack of a better term, "like each other". If any of them don't play nice with the others, you'll have problems booting at all or with stability. You can likely boot in gear 2 (or auto) with XMP profile 1, but your latency will suffer a bit. At least it should be stable. Otherwise, you may have to do what Kalsim has done and boot at 3466 with the tightest timings possible in gear 1. You could run some tests and find out which one produces better performance and stability with the games or applications you use and then stick with that. Alternatively, you could try a different brand or model of memory, but that gets expensive unless you can offload the one you have for a good price, but if it is your CPU's IMC holding you back, there's not much a different memory kit is going to do probably.
Apollo1321All I can say is that some cpus don't like certain timings on ram. I have an 8700k that will do mem at 4400 17-17-17-34, but if I set those same sticks to 4200 with same timing it boot loops at post code 7f. Same boot loops at 4400 if I try to get rtl's closer to the same on both channels. Like channel a is set at 67 but channel b is 70 or 71, I can't remember exactly. It's also very weird with ram at default jedec speeds and trying to set primary timings very loose to see what kind of frequencies the ram can do. That 8700k will either boot loop or train on first try, no in-between.