I'm having trouble with my PC after I added a 2666MHz RAM stick to my existing setup, which has three 3200MHz sticks. The system powers on, but there's no display and a red CPU light shows up. I've adjusted all the RAM speeds to 2666MHz (with an FCLK at 1333) and matched the voltage to 1.35V to align with the higher voltage sticks. I also set the timings to correspond with the slower stick and the command rate to 2. Despite these changes, I'm still facing the same issue. My motherboard is an MSI B550 Tomahawk, and I'm running a Ryzen 9 5950X with Corsair Vengeance RGB Pro RAM. Any advice on how to resolve this?
2 Answers
Mixing RAM kits can be tricky and often leads to issues like what you're experiencing. The fact that your setup works fine with the three 3200MHz sticks suggests that you're facing compatibility problems with the 2666MHz stick. It could be that the additional stick causes instability, especially since it's different from the other three. My recommendation would be to stick with one kit that matches in speed and timings to avoid these problems.
You might want to test the 2666MHz stick on its own to check if it's faulty. Sometimes, memory modules just don’t play well together. If that doesn't work, consider scaling down all sticks to 2400MHz or 2133MHz with JEDEC timings. Also, ensure your BIOS is fully updated, as sometimes a newer BIOS can fix RAM compatibility issues. Keep in mind that even though DDR4 is designed to be flexible, some combinations just won’t cooperate.
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