I recently built a new PC and installed 6000 MHz CL30 RAM, but it's only running at 4800 MHz CL40. I tried enabling EXPO to see if it would resolve the issue, but after that, the display wouldn't load when I came back from lunch. I noticed a red light on the motherboard indicating a problem with the RAM. Here are my specs for reference:
- AMD 7800X3D CPU
- Gigabyte B850 Gaming X WiFi 6E Motherboard
- 9070 XT GPU
4 Answers
I suggest trying to reinsert the RAM sticks. I had a similar problem when I added a new 16GB DDR5 stick, and my display wouldn’t show anything. Also, ensure you're running the latest BIOS. Sometimes, your BIOS might display 4800 MHz, but if EXPO is enabled, check Task Manager; it could show 6000 MT speed in Windows, which may feel much more responsive.
I don’t have the B850, but when I used a Gigabyte B550, I had to disable memory context restore to get EXPO working properly. You might want to check if that setting could help you too. [Read this post for more details](https://www.reddit.com/r/gigabyte/s/BDklijIbzf).
First things first, make sure to update your motherboard BIOS to the latest version, even if it’s a beta. This can sometimes improve RAM compatibility. Also, keep in mind that the 7800X3D officially supports up to 5200 MHz. Many people can run at 6000 MHz, but it’s not guaranteed. I suggest trying 5200 MHz first. Enable EXPO, which should automatically configure your RAM settings, then just manually adjust the DRAM frequency down to 5200 MHz. If that works, you can incrementally try higher speeds like 5300 MHz, 5400 MHz, and so on.
That's so weird? Why does it only support up to 5200 MHz? I thought the CPU could handle 6000 MHz CL30 nicely.
Your setup might be unstable. Go into your BIOS and try increasing the RAM voltage a bit—typically the DDR voltage. For instance, if it's running at 1.35V with EXPO enabled, bump it up to 1.37V and see if that stabilizes things. It can make a difference in getting your RAM to run correctly.
I’ve done a memtest and it showed no errors. What’s the purpose of changing the voltage? Also, should I tweak the MCR setting in the BIOS?
This is exactly what I’d do.