Is DDR5-6400 CL32 good for Intel? Latency, bandwidth, and gear-2 guide
DDR5-6400 CL32 is the Intel platform equivalent of AMD's DDR5-6000 CL30 sweet spot. It has the same 10 ns first-word latency, a bit more raw bandwidth, and is widely supported by Z790 and Z890 boards. It's the XMP rating most "high-performance" DDR5 kits bin for in 2026.
Calculator
RAM Latency Calculator
Timings are in memory clock cycles. True latency in nanoseconds is derived from the data rate.
True Latency
First-word latency (CL)
10.00 ns
Time from a read command to the first bit of data arriving.
I/O bus clock
3200 MHz
Cycle time
0.313 ns
tRCD delay
12.19 ns
tRP delay
12.19 ns
tRAS
25.00 ns
tRC (tRP + tRAS)
37.19 ns
Assumes one 64-bit channel. Dual channel doubles this, quad channel quadruples it.
How this is calculated
3200 MHz bus clock, 0.3125 ns per cycle, 32 cycles of CL = 10.00 ns. Peak per-channel bandwidth comes in at 51.2 GB/s, 33% more than DDR5-4800 and roughly matching DDR5-8000 kits once you account for their typically looser CAS latencies. On Intel's ring bus memory controller, the 6400 MT/s speed is comfortable with gear-2 ratio and delivers a larger practical gain than the paper numbers suggest.
Verdict
DDR5-6400 CL32 is the matching Intel sweet spot to DDR5-6000 CL30 on AMD. Pick based on your CPU. Choose this one if you're on Raptor Lake or Arrow Lake, or DDR5-6000 if you're on Ryzen 7000 or 9000.
More DDR5 scenarios
Frequently asked questions
Is DDR5-6400 CL32 stable on AMD AM5 systems?
What is the true latency of DDR5-6400 CL32?
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