Hi, i have two G.skill trident Z 6800 Mhz 16x2 kit, set in A2, B2 slots and it works perfectly. I bought one more same kit and put them in last two slots(A1, B1) and then starts strange things, pc always reboot if XMP was enable(any overlock), if i disable XMP the frequency set to 4800 Mhz it works fine, but i bought those RAMs for those speed))) I am on lates BIOS, ME, etc. win 11 with i9-13900kf, thor 1000 w p2. Now i set XMP on frequency 6400 MHz, but i can't reach speed 6800 when 2 sticks used. Can someone help or explain...
Take out the second kit. Very unlikely for 2 kits to be stable. There is a link to a thread on this somewhere, but I can’t post it because I can’t find it anymore with the forum change.
I was lucky to be able to get 4 sticks (2 sets of 2 Trident Z5 RGB, DDR5-6600 CL34-40-40-105 1.40V 32GB) for a total of 64GB to work successfully and stably using XMP after the initial build had not allowed me more than 2 sticks. Once all BIOS, Windows, Chipset updates were done, I happened to throw in the second set in a last attempt and was pleasantly surprised that it initialized the memory and all software and gaming worked perfectly thereafter.
If you want that much memory, you need to purchase a kit that has more than 32G. GSkill has new kits that might work for your board but you should check the QVL to make sure.
I just checked the QVL for your board. F5-6800J3445G32GX2-TZ5RS GSkill would work if you have a 13th gen CPU. Looks like you do with the 13900kf. That's a 64G kit. Might work for you. May need some tweaking maybe. Difficult to know.
1) Never combine memory kits, always purchase a single kit of the speed and capacity you want.
2) Two sticks work way better than four on z690/z790.
3) Manually tuning your memory can give better results.