Question 3950 x Memory Overclocking

[Mikedw2316]

I have multiple systems for a variety of reasons. I own almost all of the 3,000 family ryzen. From my experience I have used multiple different chips on all my different components. I had the 3900x installed on my x570 master with trident z royal samsung b die memory. Its rated for 3200mhz cl 14. I was able to use the ryzen ram calculator and get my ram to 3600mhz with some real tight timings similar to the cl 14. Then I put in my 3950x in and tried to go for similar overclocks on the memory but have noticed that the 3950x does not work well with anything over the xmp profile. Does this mean I have a bad 3950x? The 3950x works perfectly fine other then this. I'm new to messing with timings and overclocking memory. I am not a newb yet I'm not a pro overclocker by any means either. I tried all kinds of timings and voltages for the 3950x and it just doesn't play nice over 3200mhz on the ram. Just would like some thoughts from people with experience.

 

[zx128k]

XMP is just when they do the overclock for you. The issue he is having is his UMC or IF does not like the increase in frequency.

I had issues with VDDCR SOC (Ryzen master but CLDO SoC BIOS) being 1.2 Volts. Basically over 1.1volts can cause cracking with sound, PCIe issues.

CLDO vddp if I remember correctly is the UMC voltage and can approach vDIMM but can't equal it. https://www.techpowerup.com/review/amd-ryzen-memory-tweaking-overclocking-guide/2.html

VDDP and CLDO_VDDP are not the same thing. VDDP is a voltage to the RAM sticks, while CLDO_VDDP is a voltage to the IMC. source

CLDO vddg is the IF and can approach VDDR SOC but can't equal it. Staying within 40mV I believe is advised as it is the most stable (read it somewhere but can't remember were). https://www.overclock.net/forum/10-amd-cpus/1730834-cldo-vddg-voltage.html

Here is a spreadsheet of the values people have used. https://docs.google.com/spreadsheet...0MWVPcYjf6nOlr9CtkkfN78tSo/edit#gid=527992713

 

[Mikedw2316]

Thank you I will check that out.

 

[zx128k]

Talk's about CLDO vddg and CLDO vddp on this website. https://github.com/integralfx/MemTestHelper/blob/master/DDR4 OC Guide.md

A new spreadsheet for you here with other peoples overclocking values https://docs.google.com/spreadsheet...MWVPcYjf6nOlr9CtkkfN78tSo/edit#gid=1814864213