Some RAM modules have varying speeds and may not power on correctly on your computer.
Some RAM modules have varying speeds and may not power on correctly on your computer.
They should collaborate from the start, matching their pace to the slower one. You won’t be able to rely on XMP; you’ll need to manually set speeds and timing. The bigger concern is why you require so much RAM. For typical YouTube and gaming, 64GB is already excessive. You must provide more details since memory controllers are now built into the CPU, which significantly impacts performance. Given this, it’s likely your CPU’s memory controller can’t manage 128GB across four sticks.
If those two kits don’t work together, there are only two possibilities. First, they aren’t compatible. Second, the default speed or settings set by the BIOS won’t function on at least one stick or pair. By searching online, we see the timings differ: Corsair 5200MHz CL 40-40-40-77 and Corsair 5600MHz CL 36-36-36-76. At first glance, it might be the older RAM, but we can’t be sure. I’d begin by trying to overclock the 5200MHz to 5600MHz and see if timings can drop to 36-36-36-76. If that succeeds, proceed with new RAMs and confirm those settings are correct. If the older RAM stays at its rated speed or timings can’t be adjusted, then try overclocking and tighten the timings as much as possible. Once you identify the optimal speed and timings for your 5200MHz, remove it. Then test the 5600MHz kit to ensure it matches the same speed and settings when used alone. Make sure both units boot up correctly with those parameters. If it still doesn’t work, compatibility is likely the issue. Another option is to use all four sticks together, setting each to their default: Corsair 4000MHz 32-32-32-64. If this runs smoothly, you can increase the frequency while keeping timings low.
Sure thing, just wanted to clarify. This could also be a way to indicate using the alternative slots. As @kitnoman pointed out, pairing two different speed kits can be unpredictable. (In fact, I noticed similar problems when I bought the same kit later.) You might also try running the 5600Mhz RAM at slower clock speeds and see if it functions properly. Still, you'll need to adjust most timings yourself and avoid using DOCP/XMP settings.
Thanks for sharing the details. I followed the adjustments Kitnoman recommended, but still couldn’t get the system to boot. Even after changing everything, it only recognized the BIOS and didn’t start. It seems like the components aren’t compatible as you mentioned. I’ve already reached out to Asus via support to explore possible solutions. Appreciate all the help!
RAM support on AM5 is still uncertain at the moment. Generally, you can expect to run two DDR5 modules at their maximum speeds, though it's unlikely above 6000Mhz. Most users don't reliably boot with all four sticks loaded. This is why I'm holding out for AM5—compatibility is a risky bet, and I prefer sticking to faster options unless you specifically need the full capacity. If you really want the extra slots, you'll likely have to downgrade to DDR4 speeds.