EXPECTED LATENCY - CL30

Megatron#59 · 1 Dec 2025 at 12:27

Hi,

I’m running an AMD Ryzen 5 7600X with Corsair Dominator 6000 MHz CL30 (16 × 2) EXPO RAM.
What latency should I expect with EXPO enabled, without any BIOS tuning?
Also, after tuning, what latency could be expected?

Additionally, what adjustments or settings would you recommend?

Thanks in advance.

ATIorNvidia · 1 Dec 2025 at 22:21

In Aida it's usually somewhere around ~10 ns improvement from stock EXPO vs tuned, I wouldn't put much stock in the actual number though, as it varies from run to run, and motherboard to motherboard.

Buildzoids video here is a good starting point

Grim5 · 1 Dec 2025 at 22:27

off top of my head 6000 cl30 on zen4 is about 65ns latency

Megatron#59 · 2 Dec 2025 at 03:54

ATIorNvidia said:
In Aida it's usually somewhere around ~10 ns improvement from stock EXPO vs tuned, I wouldn't put much stock in the actual number though, as it varies from run to run, and motherboard to motherboard.

Buildzoids video here is a good starting point

I tuned the timings exactly as Buildzoid explained in the video and adjusted the tRC based on my tRP and tRAS values (tRP + tRAS = tRC). The timings are quite tight, but the system is running without any crashes so far. I’m getting only 69 ns latency.

Megatron#59 · 2 Dec 2025 at 03:55

Grim5 said:
off top of my head 6000 cl30 on zen4 is about 65ns latency

you mean on stock or expo or after tuning.
Mine was like stock 81, expo 76, tuning 69.

pooley · 2 Dec 2025 at 09:52

Grim5 said:
off top of my head 6000 cl30 on zen4 is about 65ns latency

Expo 67ns here so yeah..

ATIorNvidia · 3 Dec 2025 at 01:19

Megatron#59 said:
I tuned the timings exactly as Buildzoid explained in the video and adjusted the tRC based on my tRP and tRAS values (tRP + tRAS = tRC). The timings are quite tight, but the system is running without any crashes so far. I’m getting only 69 ns latency.

Are you running in 1:1 mode?

Download ZenTimings and post a screenshot of the settings.

Megatron#59 · 3 Dec 2025 at 06:21

I found that even though every software shows my RAM running at 6000 MHz, the BIOS automatically resets it to 4800 MHz. The primary timings in the BIOS show as 40-40-40, while my RAM kit is rated for 30-36-36.

The attached ZenTimings screenshot shows 6000 MT, but the VSOC is 1.19. However, when I check the BIOS, it still shows 4800 MHz.

Need help

Megatron#59 · 3 Dec 2025 at 06:24

ATIorNvidia said:
Are you running in 1:1 mode?

Download ZenTimings and post a screenshot of the settings.

Space Monkey · 3 Dec 2025 at 08:45

Megatron#59 said:
I found that even though every software shows my RAM running at 6000 MHz, the BIOS automatically resets it to 4800 MHz. The primary timings in the BIOS show as 40-40-40, while my RAM kit is rated for 30-36-36.

The attached ZenTimings screenshot shows 6000 MT, but the VSOC is 1.19. However, when I check the BIOS, it still shows 4800 MHz.

Need help

Are you on the latest BIOS?

ATIorNvidia · 3 Dec 2025 at 10:34

Megatron#59 said:
I found that even though every software shows my RAM running at 6000 MHz, the BIOS automatically resets it to 4800 MHz. The primary timings in the BIOS show as 40-40-40, while my RAM kit is rated for 30-36-36.

The attached ZenTimings screenshot shows 6000 MT, but the VSOC is 1.19. However, when I check the BIOS, it still shows 4800 MHz.

Need help

Cant see any images.

RSR · 3 Dec 2025 at 11:11

DDR5 6000 CL30 has a latency of 10ns
DDR5 6000 CL26 has a latency of 8.66*ns

However, if you are talking in terms of ADIA results, I'd expect results in the 60-70ns, but the OS can also have a large bearing on the results due to running services in the background. An example, on a fresh install of W11 25H2 (26200.7309) using a Ryzen 7 9700X and 32GB 6000 C26 I get 74.7ns using EXPO.

Naturally, this can be further improved with manual tweaking.