Mixing 3200 and 3600 8 pack ram timings. Please help.

The Artfull Bodger · 22 Nov 2019 at 14:12

Hi.
Once again posting for help from the overclockers tech gurus.
I have just bought some 3600 8 pack ram to work alongside my 3200 after one of the staff said they are the same binned memory.
I am looking to get them working together with manual timings. I have never tried manually tuning ram, it is something that has always confused me when reading posts.
I am using a 3600x on a MSI tomahawk max b450 board.
When I go into the bios with xmp enabled, under ram timings, I see a figure in the left column followed by a box next to it set to auto.
My first question is, should I load xmp on the 3600 ram only and copy all these timings down, disable xmp and then re-enter these numbers with both sets of ram installed?
Second question is what timings do I need to enter, the bios shows main timings, sub timings and then some more timings under a different heading (can't remember), do they all need to be entered manually?
Lastly, if I want to try running both sets of ram at 3600 but try to overclock to 15 latency, is just bumping the voltage likely to work and do I need to touch anything to do with the infinity fabric?
Thanks for any responses in advance.

opethdisciple · 22 Nov 2019 at 15:41

3600MHz @ 16 16 16 16 36 - timings (leave everything else auto)
1.35v dram
1.1v soc

If you have a 3000 CPU (which you mention 3600x) you may need to set VDDG to 1v.

No need to load the DOCP profile as your overriding them anyway.

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Oh.... just remembered.... this is very important to understand. Your RAM speed is determined by your FCLK.

I dont know whats normal for the 3600x's to achieve. But essentially the way to do it correctly is find your max FCLK and then set your ram 2 x FCLK.

The Artfull Bodger · 22 Nov 2019 at 18:04

Cheers buddy, sounds like I was overcomplicating it, nothing new there.
Will have a look about this fclk for 3600x tomorrow when I got some time.
Once again, thanks for your help, appreciate it.

facboy · 22 Nov 2019 at 21:04

good luck with it! i was worrying about buying another 3600mhz 8 pack to match my 3600mhz 8 pack from 2017, submitted a web note and they said it would be fine. refused to post at first but i must have not seated the RAM properly, plus everything was super dusty. seems fine now, passed a windows memtest at XMP, and now it's been running in windows for a whole 10m!