06-13-2022 03:12 PM
06-13-2022 04:18 PM
06-14-2022 12:56 PM
Welcome to the ROG forum.
You're unstable because you are combining two fast memory kits. You won't find any single 64GB 6400MT/s memory kits.
Simple solution - To keep the speed, use one memory kit in the recommended slots A2 - B2 (slots 2 and 4 from the cpu).
If you want to use all four sticks, settle for a lower frequency say 5400MHz - 5600MHz.
So all is not bad, you have the option to choose fast 32GB or slower 64GB.
I personally would keep the 32GB 6400MT/s.
06-14-2022 10:19 PM
Thank you for your reply. As I stated above I don't know a lot and the only things I do know/understand are form reading and doing things myself. When you say mixed kits... all 4 sticks are exactly the same. Does that still make them a "mixed kit"?
What qualifies a system as being stable? What is the standard and how would someone go about testing against that standard to see if they meet it?
As far as the z690 Maximus Formula and the 1505 bios: Will this board ever support 4 sticks at 6400 in the future or are the hardware limitations on this board the weak link?
When you say I have the options to set the MHz lower, where did you arrive at that number? Also, as far as real-world performance, how much difference are we talking with the difference of 1000 MHz?
Thank you for taking the time to help me understand,
06-15-2022 04:07 PM
Silent Scone@ROG wrote:
1. Use Karhu Ramtest or TM5 to test memory stability in the OS. Google Stress App (via BASH terminal) or HCI memtest pro also viable.
2. Four modules at 6400 is not possible. This is largely a limitation of 12th gen CPUs.
3. With a single memory kit comprising of 4x16GB, most configurations will hit a wall anywhere between 5200-5600 depending on the memory kit and CPU.
06-15-2022 10:07 PM
06-14-2022 01:27 AM
06-14-2022 03:54 PM
06-15-2022 04:06 PM
Yep, two separate memory kits of the same is still combining kits.
With memory, you want to choose either speed or capacity. When going for speed choose less density, when going for density choose a lower frequency and always choose a single kit.
9 out of 10 times, instability with memory is caused with the cpu's memory controller, higher speed and more density puts more strain on the memory controller. Raising a few voltages in the bios can help stabilize unstable ram, but in your situation, you're trying to run more than what is capable.
Technically, the Maximus Z690 Formula supports up to 128GB of 6400MHz memory, but there are no memory kits like this available.
How I arrived at a lower frequency for 64GB, if you do search on 64GB DDR5 memory kits, you'll see there are no single 64GB 6400MT/s memory kits.
Games like speed over capacity. If you're just gaming, go with the higher speed of a single 32GB kit. And since you seem to be having good luck with it, you could try overclocking it even further. If you're doing work, the 64GB of memory may benefit at the cost of a lower frequency.
A stable system means you can run benchmarks and play games without any problems.
06-15-2022 11:00 PM