Is DDR5-7200 CL34 worth it? Intel enthusiast overclocking and performance
DDR5-7200 CL34 is the enthusiast sweet spot for Intel Z790 and Z890 boards, fast enough to beat DDR5-6400 on both latency and bandwidth, still within reach of most good two-DIMM setups without pushing memory controller voltages into risky territory. Its 9.44 ns first-word latency is about 6% faster than DDR5-6400 CL32.
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)
9.44 ns
Time from a read command to the first bit of data arriving.
I/O bus clock
3600 MHz
Cycle time
0.278 ns
tRCD delay
11.67 ns
tRP delay
11.67 ns
tRAS
23.33 ns
tRC (tRP + tRAS)
35.00 ns
Assumes one 64-bit channel. Dual channel doubles this, quad channel quadruples it.
How this is calculated
3600 MHz bus clock, 0.278 ns per cycle, 34 cycles of CL = 9.44 ns. Peak per-channel bandwidth is 57.6 GB/s, 12.5% over DDR5-6400 and 20% over DDR5-6000. On Ryzen 7000/9000, the Infinity Fabric falls out of 1:1 at this speed, so DDR5-7200 actually tends to be slower than DDR5-6000 CL30 on AM5 in practice, which is counterintuitive but well documented in AM5 benchmarks.
Verdict
DDR5-7200 CL34 is the Intel enthusiast pick. Don't chase it on AM5. The 1:1 Infinity Fabric loss more than cancels the gain, and DDR5-6000 CL30 ends up faster on AMD regardless of timings.
More DDR5 scenarios
Frequently asked questions
Should I run DDR5-7200 CL34 on an AMD AM5 build?
What motherboards support DDR5-7200 CL34?
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