I recently purchased an i7 9700K and Z370 system and specifically purchased B-Die RAM for low timing and low input lag.
RAM model: Corsair Dominator Platinum RGB 32 GB 3466 MT (CMT32GX4M2C3466C16)
When I installed it in the system and enabled XMP directly, it wouldn't boot. I then tried different frequencies without XMP. When I enabled frequencies above 3200 MHz, it wouldn't POST. Probably due to processor or motherboard limitations. I then started trying settings for 3200 MHz.
The timing settings I applied are as follows:
AI Overclock Tuner: Manual
DRAM Frequency: DDR4-3200MHz
DRAM Voltage: 1.40V
CPU VCCIO Voltage 1.20V
CPU System Agent (VCCSA) 1.20V
DRAM Timing Control DRAM CAS# Latency: 14
DRAM RAS to CAS# Delay: 14
DRAM RAS# Pre Time: 14
DRAM RAS# Act Time: 28
DRAM Command Rate: 1N
DRAM Ref Cycle Time (tRFC): 270
DRAM Write Recovery (tWR): 12
DRAM Four Act Win Time (tFAW): 16
Other sub-latencies are automatic.
I didn't touch anything else. It works fine this way.
I achieved around 47ns in AIDA64 benchmark tests.
By the way, the previous owner of the RAM mentioned that they used it at 3800 MHz CL14 with an 11th-generation CPU + Z490. I didn't opt for the higher chipset for Windows 7 compatibility. I'm looking for average settings for Z370 🙂