Can't run RAM over 2667MHz on Z370 Pro4

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   Dear Noob3000,

Thanks for posting!

Let's see, when two memory modules are installed, it is recommended to install the A2 and B2 slots.

If the problem remains, kindly try the following to troubleshoot. 
1. Install only one RAM to the B2 slot and XMP to 3200MHz.
2. Try the same with the 2nd RAM on the B2 slot.

If both of the RAM work at 3200MHz on the B2 slot and also on the A2 slot, if possible, please try with a different CPU to see if it will work.

With thanks,
ASRock TSD

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ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8907	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Topic: Can't run RAM over 2667MHz on Z370 Pro4 Posted: 11 Jan 2021 at 3:50pm
	Dear Noob3000, Thanks for posting! Let's see, when two memory modules are installed, it is recommended to install the A2 and B2 slots. If the problem remains, kindly try the following to troubleshoot. 1. Install only one RAM to the B2 slot and XMP to 3200MHz. 2. Try the same with the 2nd RAM on the B2 slot. If both of the RAM work at 3200MHz on the B2 slot and also on the A2 slot, if possible, please try with a different CPU to see if it will work. With thanks, ASRock TSD

colin538a Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13 Jul 2025 Status: Offline Points: 30	Post Options Post Reply Quote colin538a Report Post Thanks(0) Quote Reply Posted: 13 Jul 2025 at 9:26pm
	ASRock Z370 PRO4, LGA1151 Asgard Bragi V3 DDR4-3600 MHz CL14 Samsung B-DIE i5 8400 also started on 2667 I sent the timings with a screenshot https://gyazo.com/d30034d97f7cb5da0511855b9b31132b https://gyazo.com/8cea84340b187da693607e1eb6f12d17 A2 B2 don't work even though they say to stick it in there. https://gyazo.com/eb6ca9624a170659799d668c7558eae6 overclocked system agent, and FCLK was about 2700mhz but the system does not start from the first time and makes 1 reboot so was from Kingston Praetor at 3000mhz

colin538a Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13 Jul 2025 Status: Offline Points: 30	Post Options Post Reply Quote colin538a Report Post Thanks(0) Quote Reply Posted: 4 hours 48 minutes ago at 11:01pm
	I managed to start in 2 and 4 slots I don't know why the first time I didn't wait maybe I was afraid of reboots and black screens) I chose xmp profile in which voltages 1.45v and set frequency 3200 and started from the first time all good start from the first time before this voltages were auto 1.352 there were problems if higher than 2666. I think it can be better here is the merit of Samsung and not mine, but my hands are crooked and the shoes are weak one cooler on the inlet so I will stop. https://gyazo.com/e5d052a47a2c80ccc6adc30a2b080a8a gpt chat advised 13-13-13 timings and called cl14 slow. and reduce TRFC to 320 but I'm not an expert who knows if this is good advice?)))

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 26813	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 3 hours 9 minutes ago at 12:40am
	You won't see much benefit going from 3200 to 3600. You now have the RAM working so you can feel free to experiment with timings and frequency. Google for a good guide, there are plenty out there. You can start by simply selecting XMP and then 3600 from the dropdown menu. If that doesn't work you can clear CMOS and try the next setting down until you get your maximum bootable frequency. If you really want to get the most out of your RAM then you can follow a guide. I honestly don't think it's worth it from a practical standpoint but to each their own. I personally wouldn't follow chat GPT advice for anything, it's too easily influenced by bad data.