DDRVPP Voltage / Dram Termination

nukemdukem · 13 Oct 2019 at 17:16

Hi All,

Would anyone be able to describe / explain what DDRVPP Voltage and Dram termination do?

I have gigabyte aorus pro wifi x570 with ryzen 3700x and cosair vengeance rgb pro 16gb 3200mhz (2x8gb).

At the moment i have manually set my DDR4 to 3200mhz as XMP profile 1 kept causing BSOD.

To do this i simply changed the memory multiplier from 21.3 to 32 and increased Dram voltage to 1.36v.

It all works fine and stable with timings 16-18-18-18-36

But DDRVPP Voltage and Dram terminaiton are currently auto and i noticed on the BIOS system overview page it shows my memory voltage as being 1.395v (not the 1.36v i set).

Before i try and go faster with tighter timings i wanted to understand if DDRVPP Voltage and Dram termination should also be auto or if i need to set values for these.

I did push my ram a bit hard on the timings at 3200mhz to 15-16-16-16-36 and it then failed to boot, i needed to reset the BIOS.

many thanks

Space Monkey · 13 Oct 2019 at 18:39

Have you tried using the Ryzen DRAM Calculator, I think it gives the correct values needed for your intended settings?

tamzzy · 13 Oct 2019 at 18:43

nukemdukem said:
Dram terminaiton

dram termination should be half your vdimm
so if you set your vdimm to 1.36v, your vtt should be 0.68v

nukemdukem said:
DDRVPP Voltage

leave that alone

nukemdukem said:
BIOS system overview page it shows my memory voltage as being 1.395v (not the 1.36v i set).

the gigabyte x570 boards have a bug where it over-reads by 0.03v (and voltage over shoots actually by 0.01v)
so in actual fact you are giving your ram 1.37v. it's not much, i wouldn't worry

nukemdukem · 14 Oct 2019 at 08:43

ok cool thanks - so i will keep DDRVPP Voltage to auto and Dram termination to half the dram voltage.

I wasnt aware of the ryzen dram calculator - will check it out now.

opethdisciple · 14 Oct 2019 at 20:28

Not good if it can't do xmp with a 3000 series chip on x570! :eek:

It'll be the Corsair ram that's the problem. I originally bought Corsair when the 1700/x370 launched and that was a nightmare.

Ended up selling it.

---

Are you doubly sure when you set DOCP in the bios and fclk to 1600 it bsods?

Your SOC voltage needs to be at 1.1v.

tamzzy · 14 Oct 2019 at 20:36

#shouldagottenedie