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Discussion Starter · #1 ·
So far I can't find a clear answer on the correct SA voltage. And I never messed with it on my last rig. How much power does it use ? Maybe tweaking it will barely change temps anyways. The SA voltage never seems to change in HWinfo, it's rock solid.

With MSI pro-z690-A, i7-12700k, Patriot viper 4000 CL16 1.45V, with most everything in the bios set to auto, I was trying to find the limits of it.

With xmp1, 4000, 16-16-16-36-52, I set 2T and gear1, my mobo sets SA voltage=1.45V, same as the Vram. With the power limit around 170W, the CPU runs around 41/37 in P95, something like that, with good temps most of the time.



With it on override mode, I started at SA voltage=1.32V, and P95 large FFT has errors on most cores in the 1st minute.
I worked up to 1.38V and was having less errors each time, and the runs were lasting longer.

It failed on 1.4V ~90min in, so I jumped up to 1.415V, hoping I got it that time. And I ran near 3h then stopped it myself.

So then I added in some CPU manual OC, keeping just under the thermal limit, and ran P95 blend for ~6h but had 1 error at ~5h


So I'll have to turn off the OC, that just complicates things. But I'm almost back to what the mobo wants to use, Vram=1.45V for 4000MHz ram, and SA voltage=1.45V

When I run xmp2, 3600MHz 14-16-16, they run at 1.35V, and SA voltage=1.35V


So what SA voltage do u people use with fast ram?
 

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Auto鈥
 

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Was using Auto which is set to 1.35V for 3600mhz DDR4 on MSI z690 PRO-A. Going to 4000mhz causes the board to pump in 1.45V! I corrected it and set it manually after that. I do not really want to exceed 1.35 and 1.4V is a hard limit. I'd prefer to keep the IMC working as is. I am back to XMP while I sort out my ram cooling issue. Have you tried increasing VDDQ voltage in an effort to avoid raising SA voltages?
 

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Was using Auto which is set to 1.35V for 3600mhz DDR4 on MSI z690 PRO-A. Going to 4000mhz causes the board to pump in 1.45V! I corrected it and set it manually after that. I do not really want to exceed 1.35 and 1.4V is a hard limit. I'd prefer to keep the IMC working as is. I am back to XMP while I sort out my ram cooling issue. Have you tried increasing VDDQ voltage in an effort to avoid raising SA voltages?

Jep for me also,1.35v is for me the max.
Just try what is stable,the lower the voltage the better off course.
 

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1.2 with ddr5 @ 6810
 

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IAuto definitely aims high, but in my case 4000mhz still took quite a bit to be stable, and I wasn't comfortable with it. Backing down to 3800mhz allowed me to drop all the way down to 1.285v and I'm very comfortable with that.

I'd mostly agree with others - 1.4v max for daily use. Although, Intel datasheet does spec 1.5v as an absolute max.
 

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whit 2x8 G.skill 4000MHZ cl 17-17-17-37 SA volt 4000MHZ 1.2 mem on 1.35v an 4200MHZ 1.35 mem on 1,45v an 4400 MHZ 1,4v mem on 1.5v
 

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Discussion Starter · #12 ·
Not much point giving your SA voltage without some ram details

Very soon I'll have a new cooler, so I'll have to run all this stuff again. But geez mine sounds high. I'll look up the same ram and see what others run at.
 

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DDR4 and DDR5 differs. On DDR4, you should stay below 1.35-1.40V at most. 1.40V has always been the max recommended limit for past generations.

Some motherboards will immediately allocate 1.45V VCCSA on Auto, but that's because they assume you're using XMP or a light overclock.
That is a vastly different scenario from a RAM that's overclocked to the max, since that hammers the IMC much harder.
 

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Motherboard Asus Z690-A Strix D4
VCCSA 1.2v but will probably drop to 1.17~1.18v after I finish tine-tuning the RAM
vDIMM 1.56v for 3900CL14 Gear1 CR2, working on fine tuning the sub-timings
12700k P-Cores 5.0GHz, Cache 4.7GHz, need 1.335v LLC4 to pass OCCT/CPU Large FFT/Extreme Preset
 

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So far I can't find a clear answer on the correct SA voltage. And I never messed with it on my last rig. How much power does it use ? Maybe tweaking it will barely change temps anyways. The SA voltage never seems to change in HWinfo, it's rock solid.

With MSI pro-z690-A, i7-12700k, Patriot viper 4000 CL16 1.45V, with most everything in the bios set to auto, I was trying to find the limits of it.

With xmp1, 4000, 16-16-16-36-52, I set 2T and gear1, my mobo sets SA voltage=1.45V, same as the Vram. With the power limit around 170W, the CPU runs around 41/37 in P95, something like that, with good temps most of the time.



With it on override mode, I started at SA voltage=1.32V, and P95 large FFT has errors on most cores in the 1st minute.
I worked up to 1.38V and was having less errors each time, and the runs were lasting longer.

It failed on 1.4V ~90min in, so I jumped up to 1.415V, hoping I got it that time. And I ran near 3h then stopped it myself.

So then I added in some CPU manual OC, keeping just under the thermal limit, and ran P95 blend for ~6h but had 1 error at ~5h


So I'll have to turn off the OC, that just complicates things. But I'm almost back to what the mobo wants to use, Vram=1.45V for 4000MHz ram, and SA voltage=1.45V

When I run xmp2, 3600MHz 14-16-16, they run at 1.35V, and SA voltage=1.35V


So what SA voltage do u people use with fast ram?
it depends entirely on your motherboard. With the Z690 Apex, 1.15 -1.25v was normal. On the EVGA Z690 Dark, you don鈥檛 touch it and leave SA stock (0.945v) even at 7200 1T.
 

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Discussion Starter · #18 ·
So do all mobo's of 1 type, set the same voltage? Or is it my CPU demands a really high voltage ???
Now I really better look up on wikipidia what that voltage does.
 

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So do all mobo's of 1 type, set the same voltage? Or is it my CPU demands a really high voltage ???
Now I really better look up on wikipidia what that voltage does.
Every CPU, motherboard, and RAM require a different amount of VCCSA (at the exact same memory settings).
If you change the memory settings (via overclocking), that'll necessitate even more VCCSA.

As long as you stay under 1.35-1.40V max for DDR4, you'll be fine.
 
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