4000MHz CL 17 against 3600MHz CL 16
4000MHz CL 17 against 3600MHz CL 16
You're setting up a gaming rig with the ROG Crosshair VIII Hero motherboard and an AMD 5950X processor. You have two DDR4 memory options: G.skill Trident Z Neo (16-16-16-36)F4-3600C16Q-32GTZN and G.skill Trident Z RGB (DDR4 4000MHz, 17-17-17-37)F4-4000C17D-16GTZR. Both fit your budget, but which is better for performance? The Trident Z Neo offers higher speeds and better stability, while the RGB model provides a cooler aesthetic. Consider your gaming needs and budget when deciding.
I’d pick the 3600 CL16 unless the 4000 model is notably cheaper. The 4000 CL17 offers little improvement over the 3600 CL16 regarding latency, and your CPU probably won’t reach 2000MHz on the FCLK, which would severely impact performance or force you to lower RAM speeds.
Zen 3 beyond 3600MHz offers minimal gains, so opt for the marginally more affordable and lower-latency Trident RGB version.
I choose the 3600 MT/s option because it’s more straightforward to set up and performance tends to plateau as speed increases. The Infinity Fabric required for core-to-core communication usually operates in a 1:1 ratio with memory speeds up to about 1800 MHz (~3600 MT/s effective). Beyond that it shifts to a 1:2 setup unless you boost it further. For workloads demanding many cores, this could actually slow things down. However, Ryzen 5xxx models can reach around 2000 MHz on the base frequency, which would align with 4000 MT/s RAM. Remember, CAS latency is expressed in clock cycles—4000 MHz RAM shows a slightly better latency. CL16 at 3600 delivers 8.88 ns CL17 at 4000 gives 8.5 ns.