Intel Core i9 13900k with Gigabyte z790 gaming x ax won’t support 6400 MHz.
Intel Core i9 13900k with Gigabyte z790 gaming x ax won’t support 6400 MHz.
Hey everyone, just got a new PC and started setting it up. Updated the BIOS and turned on XMP, but Windows won’t boot. If I turn XMP off, it might appear eventually, but RAM only shows 2400 MHz. The specs should be shown in the screenshot, and the RAM is a G.Skill F5-6400J3239G32GX2-TZ5RK module. It’s 64 GB with two 32 GB DDR5 6400 MHz modules. Help would be greatly appreciated!
Using 32GB DIMMs requires some work to get it running smoothly. By turning on XMP and reducing the frequency to 6000, the system should start up reliably and you can experiment with adjusting IMC voltages to see if it reaches 6400. The key components are System Agent, VDDQ TX, and VDD2; testing different setups can aid training and help stabilize faster memory speeds. Remember that increasing speed doesn't always equal better performance, and sometimes lowering settings can boost high-speed capability.
6400 mhz is quite impressive. Achieving consistent stability at that frequency might be challenging, especially since DDR5 is newer and 6400 is on the higher side—definitely not guaranteed. I’d opt for a lower setting personally and test what speed actually holds before adjusting further. That said, I tend to be lazy with hardware tweaks; unless you're still pushing high performance, it probably won’t make much of a difference.