How to lower the Latency of Memory

[Net3]

I have Ryzen 3600. It supports 3200MHz/s, usually unstable so i have it at 3000MHz 

Mobo: Asus TUF GAMING PLUS B450

RAM: Patriot Viper Steel 3733MHz CL17

Is it possible for me to lower the latency down as i lower the frequency of the ram? 

 

Am I doing something wrong that there is CAS 22? I think i have XMP enabled but manually set freq to 3000MHz e.g. 1500MHz

[venomtail]

For AM4 don't have RAM speeds lower than 3200MHz, anything lower than that's a pretty steep drop in performance.

[Net3]

Just now, venomtail said:

For AM4 don't have RAM speeds lower than 3200MHz, anything lower than that's a pretty steep drop in performance.

But what can i do if it is unstable? Literally everything out of the box more than 3200 or even at that speed crashes and i have no idea why. at3200 it takes some time but it crashes eventaully.

[DoctorNick]

16 minutes ago, Net3 said:

But what can i do if it is unstable? Literally everything out of the box more than 3200 or even at that speed crashes and i have no idea why. at3200 it takes some time but it crashes eventaully.

Hello. The XMP/DOCP profile might not work on your motherboard. I suggest downloading Aida64, in Aida64 go to motherboard -> SPD. Find 3733mhz or 3200mhz and write down the full timings table like this:

 

Go to bios and set dram frequency, dram voltage and timings manually.

[Net3]

my timings are like that

 

[Net3]

1 hour ago, DoctorNick said:

so far the only stable preset i've managed to get was  @1646MHz and ran it at FCLK 1600MHz /3200MHz

Tried the preset for 1755MHz and ran it at 1733MHz / 3466MHz and got BSOD. tried 3600MHz and got black screen and had to clear cmos. 

I think the 3600 cpu is garbage when it comes to that. I ran same ram sticks in another system with x570 board but with another 3600 cpu and got the same results, friend also had different ram sticks, but was also running at max 3200mhz.

 

But this at least works for now, i've used DRAM calculator before for Ryzen and it kinda sucks, absolutely everything crashes or is in need of cmos reset. 

but the only thing that i do not know is since i typed in CL15, it shows on CPUZ CL16, could you explain why is that? 

[DoctorNick]

5 minutes ago, Net3 said:

 

Yes I would choose either 3733 or 3200mhz - You can see the names of the timings on the right side: 

[Net3]

2 hours ago, DoctorNick said:

Yes I would choose either 3733 or 3200mhz - You can see the names of the timings on the right side: 

only 3200 works:)

[freeagent]

3 hours ago, Net3 said:

but the only thing that i do not know is since i typed in CL15, it shows on CPUZ CL16, could you explain why is that? 

To run an odd CL you need to turn Gear Down Mode off, and possibly switch to 2T. 1T with GDM on is like 1.5T so it’s doubtful you would notice. But it is hard to get a low latency with Zen 2. If you are under 60ns you are doing well.

[Net3]

On 11/29/2022 at 2:45 PM, freeagent said:

To run an odd CL you need to turn Gear Down Mode off, and possibly switch to 2T. 1T with GDM on is like 1.5T so it’s doubtful you would notice. But it is hard to get a low latency with Zen 2. If you are under 60ns you are doing well.

so what you are saying is that i should favor the the latency in an actual bechmark test, rather than the CAS on the ram? 

I've watched today one of the buildzoid's videos and he had better latency (decreased latency) with cl40 than cl28 

kinda crazy. btw I have 78/79ns

[freeagent]

2 minutes ago, Net3 said:

so what you are saying is that i should favor the the latency in an actual bechmark test, rather than the CAS on the ram? 

Yes. Lower is usually better of course, but tweaking certain sub timings can bring lower latency than simply switching CAS latencies depending on your sticks.

[Ebony Falcon]

8 hours ago, freeagent said:

Yes. Lower is usually better of course, but tweaking certain sub timings can bring lower latency than simply switching CAS latencies depending on your sticks.

Yeah Trfc drop in 20’s till it won’t boot then put it back up 20

trefi 35000 - 66666

Tfaw 16 with the read and write activations at 4 work in most dies according to Buildzoid 

just those 5 settings get you a lot of performance 

[Ebony Falcon]

8 hours ago, Net3 said:

so what you are saying is that i should favor the the latency in an actual bechmark test, rather than the CAS on the ram? 

I've watched today one of the buildzoid's videos and he had better latency (decreased latency) with cl40 than cl28 

kinda crazy. btw I have 78/79ns

Yeah intel mlc gui/ aida64 

pyprime score 

 

[Net3]

On 12/8/2022 at 3:06 AM, Ebony Falcon said:

Yeah Trfc drop in 20’s till it won’t boot then put it back up 20

trefi 35000 - 66666

Tfaw 16 with the read and write activations at 4 work in most dies according to Buildzoid 

just those 5 settings get you a lot of performance 

i will try to play around with them then. got a new Corsair Vengeance 32GB 3200MT kit, the timings are a bit higher in sub range than on the 16GB 3733MHz kit which i dont really understand. 

Is that like kit / die dependant? or the higher the maximum speed on the kit, and the lower you can go for your own needs, the better lows you can get on sub range timings?  

Let's take my example, viper kit with 3733mhz max speed, but underclocked at 3200mhz vs vengeance 3200mhz kit at the actual speed.