XMP profile problem after CPU upgrade

vian_siu

vian_siu

vian_siu

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I recently upgraded from a 5900x to 5950x. It was running fine. However, I noticed the RAM speed was reset to default one day, and when I tried to re-enable the XMP profile, it couldn't post.

I tried updating to the latest bios (5003), but no luck.

My mobo is Asus x570 Strix-F
and my RAM is https://www.overclockers.co.uk/team...c4-28800c16-3600mhz-dual-chann-my-002-8p.html I have two sets and use all four slots
 
memory voltage is not the only variable and probably the least likely cause as i assume you did run the current sticks and mobo successfully at 3600c16 with your old 5900x?
as the only variable that has changed is the cpu, then the cause is most likely to lie within the cpu

if my above assumption is correct then there are 2 options:
1) the IMC cannot handle 64gb 3600c16 - this is a very tough ask on any AM4 memory subsystem at the best of times and your 5900x is actually a golden sample
2) your infinity fabric cannot handle 1800mhz - rarer for 5950x, but still possible

you'll need to find out which of the 2 is the problem by elimination and then playing with the voltages (for case 1 its VSOC/VDDP, for case 2 its VSOC/VDDG)
if none of the above work at safe voltages, it may well be that your 5950x has an IO die that is just too weak to run 4x16 3600c16 sticks or IF at 1900mhz
 
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tamzzy said:
memory voltage is not the only variable and probably the least likely cause as i assume you did run the current sticks successfully at 3600c16 with your old 5900x?

i suspect that in your case, it would be the IMC quality as this plays a huge part as well...you may need to increase VSOC/VDDP

if none of the above work at safe voltages, it may well be the case that your 5950x IMC is just too weak to run 4x16 3600c16 sticks
64gb 3600c16 is a very tough ask on any AM4 memory subsystem
Click to expand...
Yes the current sticks was fine with the old 5900x. So if the voltage change doesn't, do I need to turn the frequency down a bit? I didn't think the XMP profile could cause issues since I thought they were factory-tested safe overclock.

Would decreasing the frequency require less voltage? If I lessen the timing can it run at its rated speed? I am not sure if timing or frequency is more important for Ryzen CPU.
 
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@vian_siu i've updated my original post since you quoted to explain in more detail lol :cry:

vian_siu said:
I thought they were factory-tested safe overclock.
Click to expand...
yes and no
they are factory-tested safe overclock **for the sticks of ram used as tested (ie 2x16gb)**
these xmp profiles do not account for using 4 sticks, nor any variability in quality of the rest of the components (cpu/mobo/psu)

vian_siu said:
Would decreasing the frequency require less voltage?
Click to expand...
yes
 
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vian_siu said:
If I lessen the timing can it run at its rated speed? I am not sure if timing or frequency is more important for Ryzen CPU.
Click to expand...

frequency up to 3000mhz-ish (some will say 3200mhz)
timings thereafter

they are both important but if i had to choose then my sweet spot would be 3200c16 with tighter timings

the reason being is that you will be able to run infinity fabric 1:1 synchronous mode (so no performance loss with async IF) 99.9% of the time with 3200mhz (1600mhz IF) so that takes out the variable of a weak IF as the cause of instability
and you can make up for the loss in memory/IF speed with tighter timings
 
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I got it to post with the exact timing and voltage of the XMP after changing it to 3200mhz. I think I will try and tweak that. I don't really like up the voltage as I think RAM is easily damaged, at least compared to the rest of the components.

Thanks for the help
 
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vian_siu said:
I don't really like up the voltage as I think RAM is easily damaged, at least compared to the rest of the components.
Click to expand...
ram is actually reasonably resilient to overvolting
ddr4 spec is 1.2v, but for long-term use you can run 1.35v safely, 1.4v usually
(possibly 1.5v with b-die but i've never used b-die so not going comment)

but as i said it's unlikely to be a ram voltage issue. most likely the CPU itself (so VSOC/VDDP/VDDG) - these can also be slightly overvolted if you want to attempt to use your ram at it's rated XMP speeds
 
tamzzy said:
ram is actually reasonably resilient to overvolting
ddr4 spec is 1.2v, but for long-term use you can run 1.35v safely, 1.4v usually
(possibly 1.5v with b-die but i've never used b-die so not going comment)

but as i said it's unlikely to be a ram voltage issue. most likely the CPU itself (so VSOC/VDDP/VDDG) - these can also be slightly overvolted if you want to attempt to use your ram at it's rated XMP speeds
Click to expand...
I assume if I do that, the CPU temps will go up. I hope my Noctua DH15 can keep it cool.
 
@vian_siu just stick vsoc to 1.1v...1.1v is absolutely safe for everyday use. i also use 1.1v for my 5800x3d system
1.2v-1.25v is the absolute safe limit for vsoc, but like you, i avoid running my voltages near/at max
just make sure your infinity fabric is running in synchronous mode or else you do lose performance - if you don't know where to find this you can just use ryzen master (download the program on amd website)
 
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tamzzy said:
@vian_siu just stick vsoc to 1.1v...1.1v is absolutely safe for everyday use. i also use 1.1v for my 5800x3d system
1.2v-1.25v is the absolute safe limit for vsoc, but like you, i avoid running my voltages near/at max
just make sure your infinity fabric is running in synchronous mode or else you do lose performance - if you don't know where to find this you can just use ryzen master (download the program on amd website)
Click to expand...
I upped the SOC voltage to 1.1v but I couldn't get it to post at 3600mhz. 3566mhz is the closest I can get. I changed the FCLK to 1766 to set the 1:1 ratio. I guess this is the max my chip can do without doing more voltage changes.
 
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