Question Correct timings for my ram? Corsair can't help me

[cheekykid]

I am looking for some help to find which are the correct timings for my DIMM's and Corsair doesn't seem to know. Their reply is: "Unfortunately, we are unable to assist with providing the specific timings for underclocking/overclocking memory kits. Outside of the applications suggested, I advise reaching out your motherboard's manufacturer for further assistance. Enjoy your day!"


I have four 16GB ‎CMH32GX4M2Z3600C18 paired with my AMD 5900X. Due to my cpu I can only run them up to 3200Mhz.

"I think" the correct timings for 3200Mhz are as follows:

• CAS Latency (CL): 16
• RAS to CAS Delay (tRCD): 20
• Row Precharge Time (tRP): 20
• Cycle Time (tRAS): 38
• Set the DRAM Voltage to 1.35V.
  
  I am not sure what should I put for tRCDWR which BIOS has set it at 22.
  
  
  Does anyone know if am on the right path here?
  

 

[KingLoki]

Enable XMP profile and check speed and timings

https://www.corsair.com/ww/en/p/mem...-kit-a-black-cmh32gx4m2z3600c18#tab-techspecs

 

[cheekykid]

Enable XMP profile and check speed and timings

https://www.corsair.com/ww/en/p/mem...-kit-a-black-cmh32gx4m2z3600c18#tab-techspecs

If I enable XMP that puts my ram at 3600Mhz. Would the timings for 3600 be also good for 3200?

 

[KingLoki]

Yeah should be fine. Boot it up and run cpu-z program and check memory inside there. When you are overclocking memory to push it faster, the timings normally loosen up anyways.

 

[cheekykid]

I did that and the timings are 18-22-22-42 so I suppose these are the ideal ones? So basically right now I run at 3200mhz 18-22-22-42.

 

[JohnBonhamsGhost]

If I enable XMP that puts my ram at 3600Mhz. Would the timings for 3600 be also good for 3200?

have you enabled XMP and found that the 3600Mhz profile is not supported?
or are you just guessing that this motherboard doesn't support anything above 3200Mhz?

most CPUs & motherboards may have a default minimal supported rate stated in their specs,
but will still run RAM manufacturer profiles.

 

[faalin]

According to Corsairs webpage they are a 3600Mhz 18-22-22-42.

You will have to try tighter timings @ 3200Mhz, drop down to 17-22-22-42, if that works then try 16-22-22-42, if not then move back to 17. Leave the 17 and try dropping down to 17-21-22-42 and so on. There are no golden numbers that every ram stick will run at, you have to test and see where YOUR's will work at.

Being that you are running 2 different kits together and 4 sticks im guessing you wont get much under the ratted specs.

 

[KingLoki]

👍

 

[cheekykid]

have you enabled XMP and found that the 3600Mhz profile is not supported?
or are you just guessing that this motherboard doesn't support anything above 3200Mhz?

most CPUs & motherboards may have a default minimal supported rate stated in their specs,
but will still run RAM manufacturer profiles.

When I enable XMP the speed goes to 3600 and the system runs though I haven't done any testing as to how stable it would be.

I been reading for a while and I still can't decide between 3200 and 3600

 

[kanewolf]

I am looking for some help to find which are the correct timings for my DIMM's and Corsair doesn't seem to know. Their reply is: "Unfortunately, we are unable to assist with providing the specific timings for underclocking/overclocking memory kits. Outside of the applications suggested, I advise reaching out your motherboard's manufacturer for further assistance. Enjoy your day!"


I have four 16GB ‎CMH32GX4M2Z3600C18 paired with my AMD 5900X. Due to my cpu I can only run them up to 3200Mhz.

"I think" the correct timings for 3200Mhz are as follows:

• CAS Latency (CL): 16
• RAS to CAS Delay (tRCD): 20
• Row Precharge Time (tRP): 20
• Cycle Time (tRAS): 38
• Set the DRAM Voltage to 1.35V.
  
  I am not sure what should I put for tRCDWR which BIOS has set it at 22.
  
  
  Does anyone know if am on the right path here?

Boot at default clock. Use CPUz to see all the timing tables in the SPD tables. There is probably a 1600 base clock profile.

 

[KingLoki]

Download this performance software and run a benchmark on the memory. Will show infomative details and overall score when tweaking ram.

https://www.passmark.com/products/performancetest/download.php

 

[BFG-9000]

When I enable XMP the speed goes to 3600 and the system runs though I haven't done any testing as to how stable it would be.

I been reading for a while and I still can't decide between 3200 and 3600

Given that 3600 is considered the "sweet spot" for Zen 3 and nearly every example can run that, I would just do the testing.

It's not like you wouldn't have to do stability testing when tuning timings for the 3200 speed unsupported by the memory manufacturer, is it? In either case you are overclocking--either running the CPU memory controller at a faster than supported speed, or memory at slower speed but tighter timings than is supported, and that means trial-and-error until it works.

The whole point of XMP is to minimize the trial-and-error part, so if you had wanted 3200 memory you should've bought 3200 memory.