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Is DDR5-6000 CL30 the sweet spot? AM5 performance and timings explained

DDR5-6000 CL30 is the single best DDR5 value target for AM5. Matched Infinity Fabric, 10 ns latency, and widely available XMP kits. There's essentially no reason to pick anything else unless you're chasing benchmarks on an Intel platform.

DDR5-6000 CL30 is a common AM5 tuning target for Ryzen 7000 and 9000. The relevant 1:1 relationship is UCLK:MCLK, the memory-controller clock and memory clock, not Infinity Fabric. Its calculated CAS delay is 10.00 ns, compared with 8.89 ns for DDR4-3600 CL16. Total application performance also depends on bandwidth and other timings.

By TechCompare · Updated

First-word latency
10.00 ns
CL30 @ 3000 MHz bus
Row cycle time (tRC)
38.7 ns
tRP + tRAS
Peak bandwidth
48.0 GB/s
Per channel

Calculator

RAM Latency Calculator

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

3000 MHz

Cycle time

0.333 ns

tRCD delay

12.67 ns

tRP delay

12.67 ns

tRAS

26.00 ns

tRC (tRP + tRAS)

38.67 ns

Peak bandwidth per channel48.0 GB/s

Assumes one 64-bit channel. Dual channel doubles this, quad channel quadruples it.

This exact DDR5-6000 CL30 kit, pre-loaded. Tune the timings or compare against another kit.
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How this is calculated

DDR5-6000 has a 3000 MHz memory clock. Thirty CAS cycles therefore take 10 ns, with 48 GB/s peak bandwidth per 64-bit channel and 38.7 ns tRC for this preset. At UCLK=MCLK, the controller also runs at 3000 MHz. FCLK is independent and commonly left on Auto around 2000 MHz.

Verdict

The 1:1 mode means UCLK=MCLK=3000 MHz at DDR5-6000. FCLK is separate, commonly around 2000 MHz, so it is not a 1:1 fabric ratio. A faster kit does not automatically force UCLK=MCLK/2. DDR5-6400 can work at 1:1 on some CPU and board combinations, but stable settings depend on the CPU sample, BIOS, memory kit, and DIMM configuration. Validate stability and benchmark the actual workload.

More DDR5 scenarios

DDR5-4800 CL40
DDR5-4800 CL40 is the JEDEC baseline spec every Intel 12th-gen, 13th-gen, and early AMD AM5 platform validates against.
View details ➜
DDR5-5600 CL36
DDR5-5600 CL36 is a common DDR5 speed grade, but the maximum data rate supported by an Intel 14th-gen CPU varies by model.
View details ➜
DDR5-6400 CL32
DDR5-6400 CL32 is the Intel platform equivalent of AMD's DDR5-6000 CL30 sweet spot.
View details ➜

Related guides

DDR4 vs DDR5 latency
The premium DDR5 tier this kit sits at.
View guide ➜
L3 cache vs RAM latency
How this premium tier's latency sits against L3 cache.
View guide ➜

Frequently asked questions

Why is DDR5-6000 CL30 considered the sweet spot for AMD Ryzen?
It often allows UCLK=MCLK at 3000 MHz with a 10 ns CAS delay. Infinity Fabric FCLK is separate. This is a common tuning target, not a guarantee for every CPU and memory configuration.
What is the nanosecond latency of DDR5-6000 CL30?
It has a first-word latency of exactly 10.00 ns, making it the standard recommendation for premium DDR5 builds.
Why is 6000 CL30 a common target instead of 5600 or 6400?
It balances bandwidth and timings while often supporting UCLK=MCLK at 3000 MHz. DDR5-6400 can also run at 1:1 on suitable systems, so there is no universal 6400 cutoff. Check your board memory list and test stability.
Is DDR5-6000 CL30 better for gaming than DDR5-6400?
Not universally. Compare actual timings, UCLK mode, stability, and game benchmarks. A stable DDR5-6400 configuration at UCLK=MCLK can be useful. FCLK runs independently and is not forced into a 2:1 ratio by selecting 6400 MT/s.

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