Computer Type: Desktop
GPU: Sapphire Nitro 5700XT
CPU: RYZEN 9 5950X 16 CORE 32 THREADS
Motherboard: Asus Crosshair VIII Hero non WiFi
BIOS Version: 4805
RAM: 32GB (16GB*2) G.SKILL TridentZ B-DIE 3200mhz CL14 https://www.gskill.com/product/165/168/1536199461/F4-3200C14D-32GTZ
PSU: Corsair RM750
Case: Fractal Design Define R6 USB-C
Operating System & Version: WINDOWS 11 PRO 23H2
GPU Drivers: Latest AMD
Chipset Drivers: Latest Chipset
Background Applications: N/A
Description of Original Problem: I have been running the same motherboard and memory since I built the system in 2019 originally with a Ryzen 9 3900X with memory and Fclk both at 1900mhz. I just upgraded to the Ryzen 9 5950X but not matter what I do I can't get the memory and Fclk to go to 1900mhz, the max I can get is 1866mhz. I realize this is a minor and unnoticeable difference but I would like to get it running where I have had it running for 5 years without issue.
Troubleshooting: I've tried different built in B-DIE timing from the motherboard, I've tried conservative timings and upping voltages on the memory and SOC and nothing will boot above 1866mhz. I am wondering if the 5950X just isn't able to run the Fclk as high as the 3900X but can't seem to find anything saying that. Any help is appreciated.
4 Comments
There’s a common “hole” in FLCK at 1900, you can try 1933. There’s a chance it’ll boot, but often you’ll get WHEAs on frequencies above the “hole”. 1866 might by your limit.
Not all CPU samples can do 1900fclk. >1900 doesn’t work properly. It’s the CPU interconnect, the stability of it has nothing to do with the RAM.
As the other comment said there is a common FCLK hole right at 1900 with Ryzen5000. I have had two 5950Xs and a couple other Ryzen5000 chips and 1800 is easily the best overall solution for memory speed if you want to sync FCLK 1:1
Ryzen 5000G CPUs are really the only ones you can get 1900+ FCLK to run stable, but any regular chips without integrated graphics youre better off sticking to 1800. My 5600G would run 2000FCLK, but all my non G parts wouldnt boot or be stable at or past 1900FCLK. This is how it is regardless of your memory kit, Ryzen5000s FCLK does not play nice with any kit once you set FCLK to 1900MHz. For my 5600G I was using a GSkill 3800 CL14 B-Die kit that I could push well beyond 4000MT\s. But with my 5950Xs the FCLK said no to pretty much any speed above 1800
One of my 5950X I could boot at 1966 and 2000 FCLK (not stable) but 1900 and 1933 would never boot for me. The other 5950X would boot at 1866 and 1933 but not 1900 or above 1933.
If youre overclocking for fun then you really need to push the limits and play around with voltages if you want it to work. But in those cases you can probably get a benchmark run in at best but I wouldnt trust it for daily long term use. If you are looking for daily use, just stick to 1800. Even at 1800 MCLK\FCLK you can still push frequency and power limits way up and get really good performance.
As others have mentioned, you might just have a hole at 1900. You can try 1933, as that could potentially be on the other side of the hole but there’s no telling. The cores and memory controllers are both at the mercy of the silicon lottery separately, so you can have a different outcome for both parts. 1966 and 2000 could be a potential too, but you’d most likely run into WHEA at 2000… but it’s not set in stone. My 5800X has terrible PBO CO ability, but it runs 2000 FCLK like it was made for it and has never produced a WHEA from it. I’d give higher FCLKs a try if you haven’t