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SOC Voltage (7800x3d)

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23K views 10 replies 7 participants last post by  InsidiousBoot  
#1 · (Edited)
What's the deal with SOC voltage, everywhere I look people are still in shellshock over 1.3V from back when the CPU's were burning left and right in some cases.

On my Taichi B650E Lite motherboard it defaults to 1.3 V (RED) by default when running XMP profile. I enter some tighter timings e.t.c. it's fine.

But when I lower voltage to 1.25V or lower it's always unstabe. (VSOC @ 1.275V atm doing some Karhu RAMtest, untested. There is a fan on the memory)

X3D might just be very hit and miss.

Anyway, here's a screenshot of my timings currently. I tried lower but had issues with stability and I couldn't be bother to tighten it further.

I just find the voltages confusing in general on AM5...

Image
 
#2 ·
1.3 is fine. Is it optimal? I guess not. For 2000 fclk, being unstable at 1.275 is pretty poor. Generally, it should be stable at 1.05-1.15 (from my experience and what I've seen).

Anyway, don't worry about it. If it's stable at 1.3 and the temps are ok, you're good.

Maybe someone with some better insight will come and sort it out.
 
#3 ·
What's the deal with SOC voltage, everywhere I look people are still in shellshock over 1.3V from back when the CPU's were burning left and right in some cases.

On my Taichi B650E Lite motherboard it defaults to 1.3 V (RED) by default when running XMP profile. I enter some tighter timings e.t.c. it's fine.

But when I lower voltage to 1.25V or lower it's always unstabe. (VSOC @ 1.275V atm doing some Karhu RAMtest, untested. There is a fan on the memory)

X3D might just be very hit and miss.
try this:
Image


my daily 1.45v settings, fairly conservative, try them at 6000 first andy your ProcODT is a bit high at 60 Ohms, but that depends on m/b and I dropped mine from 48 to get these 100% stable (well 6 hrs of TM5 stable)
 
#10 · (Edited)
try this: View attachment 2658369

my daily 1.45v settings, fairly conservative, try them at 6000 first andy your ProcODT is a bit high at 60 Ohms, but that depends on m/b and I dropped mine from 48 to get these 100% stable (well 6 hrs of TM5 stable)
Do you mean 1.45V on DIMM's? I think I can pull that off. (With AMD boxed fan on the sticks pointed) I don't know the safe temp for M die but it's hovering around 45c always <50C even in 28C room. So far with PWM @ 1500rpm at default settings for Silent.

Your settings so far has been stable for me, I'm aware from Buildzoid that primary timings mean not that much anyway. So I'm not concerned about CL32 vs CL30 for example. But the relaxed sub timings probably are nice. I can't say what has happened with my system as it was stable at first. But I changed so many bios settings over the course of a month and a few BIOS revisions. Suddenly it wasn't. Now I'm running the latest BIOS revision 3.01 BETA from ASROCK and your settings with only mem timings and voltages literally everything else left at stock/default except for fan PWM speeds. Planning on changing a few things later but not a priority. Need to update to later BIOS versions anyway if you plan on upgrading to next gen CPU's. So I don't know but THANKS.

Will be interesting if I can hit higher operating speeds but for now this will suffice.

Image


Update: Finished testing with Karhu RAM Test (apparently means BEAR in Finish)
 
#4 ·
My 7800x3d it doesn't like high vsoc, so when I first got it I thought I had a bad cpu as I set up the vsoc like everyone else at 1.3v but then I found out that it likes low vsoc . so I have a 2200fclk with 1.1vsoc that has been working fine for the past several months. you can try to do that!
 
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#5 ·
My 7800X3D sample needs 1.3v for 2133 FCLK and 6400 memory (3200UCLK and MCLK) and around 1.2v for 2000/3000 FCLK/UCLK. I normally keep it at 2133/3000 with 1.25v. Wouldn't use over 1.3v 24/7, but I haven't run into any signs of trouble after protracted stretches at 1.3v.
 
#6 ·
I think Vsoc is where the silicon lottery shows itself. If your CPU takes 1.2v Soc or less, 2200Fclk should work. First thing I would suggest is @6000 find the lowest Vsoc you can run at that gives you an idea what fclk you can run at, remembering that the opposite of that is to some extent true ( at least at 1:1) that is, if you go to 6400 you might need to up the Vsoc a bit.
It's a balancing act
 
#11 ·
Image


Still stable, and never had any issues whatsoever before this day in day out. Just now running CL30 instead of 32 since I am not planning on doing 6400MHz. other than that I changed tRFC timings. Doubt it matters in grand scheme of things, but there it is. Apparently sub timings are more important than primary ones so any of this might still not make a difference but it looks better so fair enough.

Just grateful for those that helped me out. Stable timings are worth so much in daily life.
 

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