4 RAM DIMMS now problems rebooting

Ben28uk · 30 Mar 2021 at 23:55

Hello i have just installed 2 x extra 8GB RAM DIMMS into my
ROG STRIX B450-F GAMING II - ASUS which gives me a total of 32GB (4 x 8GB) 3200MHZ RAM. All are the same model number and brand. I booted the computer and it rebooted during the POST cycle and eventually loaded to windows after 3 reboots. The RAM Speed is now showing at 2133MHZ when it was showing 3200MHz with just 2 installed and XMP in the bios activated. How do i get the speed back up to 3200 across 4 DIMMS?

Regards

Ben

Danny75 · 31 Mar 2021 at 03:04

Whenever you add or swap RAM (or flash BIOS) it's good to reset to default beforehand. In this case, seems the motherboard has done it automatically. Try going back in and enabling XMP again. Some boards have two XMP profiles, so any issues try the other. Failing that, update this thread with what RAM you are using and what CPU, and hopefully someone familiar with either could offer some tips.

VonScar · 31 Mar 2021 at 06:35

Ben28uk said:
Hello i have just installed 2 x extra 8GB RAM DIMMS into my
ROG STRIX B450-F GAMING II - ASUS which gives me a total of 32GB (4 x 8GB) 3200MHZ RAM. All are the same model number and brand. I booted the computer and it rebooted during the POST cycle and eventually loaded to windows after 3 reboots. The RAM Speed is now showing at 2133MHZ when it was showing 3200MHz with just 2 installed and XMP in the bios activated. How do i get the speed back up to 3200 across 4 DIMMS?

Regards

Ben

Pull out new RAM and reboot PC and see if the problem goes away. New RAM may be faulty.

To check RAM is faulty test with Memtest86. Instructions on site. If a fail, RMA RAM.

KompuKare · 31 Mar 2021 at 06:53

Yes, as @Danny75 said, you really have to list the exact memory make & model and the CPU if you want meaningful help.
While the mobo plays a part, the memory controller is on the CPU, and memory modules vary a lot.

DoneADougalOnSofa · 31 Mar 2021 at 11:11

Given the lack of info here (particularly which Ryzen chip you have) I'm going to say that you may not be able to run 3200 with four sticks.
Four DIMMs at that speed is really pushing it for most Ryzen 1000, 2000 and even some 3000 series chips. 2 sticks is a far easier load for the memory controller than 4, and many people run in to problems in this situation.

I'd recommend trying 2933MHz if 3200 won't play. Make sure the board is setting the memory voltage correctly- should be 1.35v, although personally I'd give it about 1.37v.

My old 2700X did 3200 with two sticks, but wouldn't go over 2933 with four sticks for love nor money- and that was with expensive, 'Ryzen-friendly' Samsung B-die RAM...

Ben28uk · 31 Mar 2021 at 14:57

The CPU is a Ryzen 3600 and a completely new build. All 4 RAM Dimms are PNY - XLR8 DDR4 3200 MHZ -Product code 532931. We set XMP to 2800 and it booted up without issue and windows recognised it working at that speed. But when it came to restarting or shutting down windows would just cycle for ages at the shut down page and not actually shut down without a hard reset. I tryed with just with the 2 x new DIMMS and it rebooted and restarted completely fine at 3200Mhz on XMP. I tryed XMP off with all 4 DIMM at 2133Mhz and still had problem with the restart. Generally is it better just to use 2 DIMMS opposed to the 4 to avoid issues?