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64gb ram ryzen

faceman123 said:
I have 4 x 16gb dimms 3200c16 although they are B-die Corsair Vengance RGB PRO - I can't seem to get them past 2800mhz =\, is there something im doing wrong
Click to expand...

You haven't said what happens when you try to run >2800MHz and since nobody has asked you've got nothing much to go on.

Unstable/rebooting means your timings and voltages are out whereas if it plain won't boot you don't have the correct impedances for the RAM to initialise. Instability can happen if you're right on the edge of the impedances too but they mostly cause no-boot when wrong (3 long beeps IIRC). The impedances can and do change as you change memory divider....ProcODT is the one that has the biggest initial effect. I think this is the problem: ProcODT isn't moving with the ram divider OR it is fixed at a setting that is 'ok' at lower speeds but then won't work after a certain point so you get no boot. I've seen both of theses things on multiple different boards.

When it comes to the ryzen timings calculator (by 1usmus) i've had zero help from it running 4x16GB....timings and impedances are way off.

T-top and daisy-chain implementations have a huge effect on what the impedances need to be set to but in my experience don't have much effect on attainable speeds. T-top is a tiny bit faster (for 4 sticks) but noting to write home about. I think this is why for x570 all the manufacturers have gone daisy-chain to get the highest 2-stick speeds (for the PR/marketing) as that's most common. x370 and x470 were a mix of types.

I find bios aren't optimised for the faster speeds and 64gb so they won't auto-set (by xmp or just setting ram divider) but will manually set with some fiddling.

I have 64gb of 3466 LPX running @ 3133 on an x370 Fatality Pro (t-top and basically a taichi with bling and 5gbps nic) with r1700, and 64gb of 3733 LPX running @ 3066 on an x370 Titanium (daisy-chain) with r1800X. I get the same result swapping the RAM and CPU across the boards so i don't think i've won the silicon lottery with two different models of CPU and i hit the same wall with different CPU/RAM on each board. These both pass multiple memtest passes including the hammer test so i'm happy they are stable and i don't get any 'oddness'.

As an aside, yes these faster Corsair kits are usually b-die but the timings seem to look more like e-die. You definitely cannot set what look like the usual b-die timings and expect them to work. The V2 profile on ryzen timing calculator gets close but still wants to provide timings that are way too tight.

If you are using the specs in your sig i'd expect you to get 3200 easily with 64gb (as the CPU mem controllers and motherboards are way better than 1st gen) but you'll need to manually set the impedances and timings yourself. You really are now into having to learning how your board and RAM set themselves up together and understanding what changes happen organically as you increase the memory speed. By noticing the trend your board/ram will show you how the settings need to change and then you have to work out how to scale that out to the higher speeds. Use RTC by TheStilt to check what changes on your ram up to 2800. Similarly, try 2 sticks at the same ram speeds and you will notice what i mean about particular setting changing (bus impedances) while others stay the same (timings).

If you are going to buy another board (which i wouldn't be) buy one with the ram you have on the QVL and it should work. Doing it any other way is a lottery. Otherwise, have some fun while learning something and you'll probably get a lot further at no cost.
 
Augustus said:
You haven't said what happens when you try to run >2800MHz and since nobody has asked you've got nothing much to go on.

Unstable/rebooting means your timings and voltages are out whereas if it plain won't boot you don't have the correct impedances for the RAM to initialise. Instability can happen if you're right on the edge of the impedances too but they mostly cause no-boot when wrong (3 long beeps IIRC). The impedances can and do change as you change memory divider....ProcODT is the one that has the biggest initial effect. I think this is the problem: ProcODT isn't moving with the ram divider OR it is fixed at a setting that is 'ok' at lower speeds but then won't work after a certain point so you get no boot. I've seen both of theses things on multiple different boards.

When it comes to the ryzen timings calculator (by 1usmus) i've had zero help from it running 4x16GB....timings and impedances are way off.

T-top and daisy-chain implementations have a huge effect on what the impedances need to be set to but in my experience don't have much effect on attainable speeds. T-top is a tiny bit faster (for 4 sticks) but noting to write home about. I think this is why for x570 all the manufacturers have gone daisy-chain to get the highest 2-stick speeds (for the PR/marketing) as that's most common. x370 and x470 were a mix of types.

I find bios aren't optimised for the faster speeds and 64gb so they won't auto-set (by xmp or just setting ram divider) but will manually set with some fiddling.

I have 64gb of 3466 LPX running @ 3133 on an x370 Fatality Pro (t-top and basically a taichi with bling and 5gbps nic) with r1700, and 64gb of 3733 LPX running @ 3066 on an x370 Titanium (daisy-chain) with r1800X. I get the same result swapping the RAM and CPU across the boards so i don't think i've won the silicon lottery with two different models of CPU and i hit the same wall with different CPU/RAM on each board. These both pass multiple memtest passes including the hammer test so i'm happy they are stable and i don't get any 'oddness'.

As an aside, yes these faster Corsair kits are usually b-die but the timings seem to look more like e-die. You definitely cannot set what look like the usual b-die timings and expect them to work. The V2 profile on ryzen timing calculator gets close but still wants to provide timings that are way too tight.

If you are using the specs in your sig i'd expect you to get 3200 easily with 64gb (as the CPU mem controllers and motherboards are way better than 1st gen) but you'll need to manually set the impedances and timings yourself. You really are now into having to learning how your board and RAM set themselves up together and understanding what changes happen organically as you increase the memory speed. By noticing the trend your board/ram will show you how the settings need to change and then you have to work out how to scale that out to the higher speeds. Use RTC by TheStilt to check what changes on your ram up to 2800. Similarly, try 2 sticks at the same ram speeds and you will notice what i mean about particular setting changing (bus impedances) while others stay the same (timings).

If you are going to buy another board (which i wouldn't be) buy one with the ram you have on the QVL and it should work. Doing it any other way is a lottery. Otherwise, have some fun while learning something and you'll probably get a lot further at no cost.
Click to expand...

Thank you very much, this means a lot - yes i used the calculator it was trying to make me set c14 timings!, I have gone for a Asrock Gaming phantom X ( needed 7.1 + 2.5gbp nic) so hopefully i can get atleast 3000mhz, i'll read up more and play around manually, thank you
 
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