Hi, I recently purchased: Asus ROG Strix X570-E AMD Ryzen 9 5900X Corsair 2x16GB DDR4 4000Mhz 19-23-23-45 The PC will not post. CORSAIR Vengeance RGB Pro (AMD Ryzen Ready) 16GB (2 x 8GB) 288-Pin DDR4 4000 (PC4 32000) Desktop Memory Model CMW16GX4M2Z4000C18. Overclocking RAM on Zen 3. AMD's upcoming Ryzen 5000 CPU lineup is recommended to pair with DDR4-4000MHZ system memory speed for the best performance and least system latency. The G.Skill kit is over twice the price of the Corsair one. The white VGA light on the MB is on and the debug leds hang at code 36. I run an Asus TUF gaming X570 plus with a Ryzen 5600X. AMD Ryzen 5 5600X CPU Review & Benchmarks - New Gaming Best, & Workstation, Power - Gamers Nexus, Nov 6, 2020 . All fans and lights spin up and it looks and sounds just fine but I'm getting a black screen on boot. I've learned a little today about upgrading ram to higher clock speed models and I wanted to share what I have seen so far In my testing. G.Skill is updating its popular Trident Z Neo memory to 4,000MHz (effective) speeds, which places it right in the so-called 'sweet spot' for AMD Ryzen 5000 processors. Name Brand Memory IC JEDEC Timings XMP Timings Tier; F4-3200C14Q-64GTZ: G.SKILL: Samsung B-Die: 2133 / 15-15-15-35 2T: 3200 / 14-14-14-34 2T: Ready for 3rd Gen AMD Ryzen Testers at techpowerup.com decided to check how DDR4 memory clocking affects the performance of the new AMD Ryzen 9 3900X CPU, and whether Infinity Fabric Zen 2-based GPUs are still severely limiting RAM overclocking. 4000Mhz dimms are great because if Zen3 can overclock their infinity fabric to 2ghz, you can run a 1:1 divider with this ram. Using our Patriot Viper 4400Mhz memory kit, which comprises Samsung B-Die Ram with CL19 timings, we were quickly able to establish that our Ryzen 5800X was stable at 4000MHz with Infinity Fabric (Fclck) at 2000MHz. Whilst I've seen many people here state 3600 MHz is the sweet spot, Steve seems to be using 3200 MHz RAM for his testing in the video above. How RAM Affects AMD Ryzen 9 3900X Performance. When maxing out the infinity fabric go for tighter timings as de-syncing will decrease performance. 4000mhz RAM tuning with Ryzen 5600x 01-12-2021, 11:18 AM. 4066MHz was not stable. It's somewhere around 16 cas latency and 3800Mhz Ram with a 1900Mhz infinity fabric. CAS Latency: 18 Voltage: 1.35V Timing: 18-22-22-42 Recommend Use: AMD 300 Series / AMD 400 Series / AMD TRX40 / AMD & Intel Compatible / AMD 500 Series / Intel 300 Series / Intel 400 Series Model #: CMW16GX4M2Z4000C18 Return Policy: View … Overclocking on the Zen 3 platform proved relatively straight forward. It’s about 11% faster on paper (400 MHz) but I feel like I’ve heard that the infinity fabric on Ryzen CPUs downclocks after the RAM exceeds 3600 MHz (or something to that effect), meaning that the increased clock speed won’t necessarily result in an equivalent increase in RAM performance, and it could hurt stability. Only use higher RAM Mhz speeds when your infinity fabric can keep up. Runnings a 1:1 ratio with MCLK and FCLK is best for Ryzen. The CPU is in PBO-mode and hits a max of 4.85 the way its currently set up.