What Voltages to Use for Underclocking RAM to 2933 and 2666?

[avrona]

I have two sticks of Vengeance LPX 3000mhz RAM, what voltages should I set them for when underclocking them to 2933MHz and 2666MHz?

 

[TheLostSwede]

1.2V is standard Voltage for DDR4, but maybe not at 2933. Try 1.3 or 1.25V.
Why would you want to underclock the RAM though?

 

[avrona]

1.2V is standard Voltage for DDR4, but maybe not at 2933. Try 1.3 or 1.25V.
Why would you want to underclock the RAM though?

So do I do 1.3V then for both 2666 and 2933?

 

[TheLostSwede]

So do I do 1.3V then for both 2666 and 2933?

2666 ought to run at 1.2V, but you're simply going to have to try. I mean, the system either works, or it doesn't.
You might have to loosen up the timings if you want low Voltage and higher speeds as well.

 

[kapone32]

You would have to see if your RAM supports 1.2 but I would not worry about that as undervolting RAM is actually pointless. When you pick the speed in the BIOS it should adjust the voltage accordingly but will stay at 1.35 which is the default setting for the RAM you have. I guess you have not updated your specs in a while as it still shows you have an FX processor.

 

[avrona]

You would have to see if your RAM supports 1.2 but I would not worry about that as undervolting RAM is actually pointless. When you pick the speed in the BIOS it should adjust the voltage accordingly but will stay at 1.35 which is the default setting for the RAM you have. I guess you have not updated your specs in a while as it still shows you have an FX processor.

My BIOS doesn't adjust them automatically so that's why I'm asking here. Also no I'm not running on an fx on my main PC now.

 

[TheMadDutchDude]

You still haven’t answered why you want to under volt and clock your RAM...

 

[GoldenX]

RAM undervolting wont help much in reducing power consumption.
Anyway, I'm currently at 2933MHz at the standard 1.2v. With normal latencies, you should be able to archive something similar.

 

[flmatter]

Also no I'm not running on an fx on my main PC now.

You need to update your system specs so people can help you better. Yes the new motherboards have an auto setting for ram as well as XMP setting for OC profiles for ram. update your specs
Your ram 2933 will only run at the 2666 speeds as well. The default voltage for 2666 is fine as well. It is not recommended that you mix match ram and speeds because it can cause system instability and you will be back asking more questions why my system is sluggish or whatever.
Before you say again you do not have an auto setting update your specs and or link your new motherboard.

 

[Tatty_Two]

I have Vengeance LPX Ram, I have gone the opposite way, stock voltage at 3000mhz is 1.30 for mine @ CL15 (I think), I can do 3200mhz at CL16 or 3100mhz @ CL15 both on 1.35V @ 1T.......... for you I would just be safe and set at 1.30v for either speeds and leave it there, I have no doubts 2666 would run at 1.25V but it's unlikely 2933 will unless you tweak timings accordingly.

If you really want to keep voltage low then maybe leave at 1.25v and you may be able to set 2666 @ CL14 and also at 1.25v you may get away with 2933 @ CL16, have a play.

 

[avrona]

You need to update your system specs so people can help you better. Yes the new motherboards have an auto setting for ram as well as XMP setting for OC profiles for ram. update your specs
Your ram 2933 will only run at the 2666 speeds as well. The default voltage for 2666 is fine as well. It is not recommended that you mix match ram and speeds because it can cause system instability and you will be back asking more questions why my system is sluggish or whatever.
Before you say again you do not have an auto setting update your specs and or link your new motherboard.

I think you just misunderstood my post. My RAM isn't 2933, it's 3000 stock, and I want to know what voltages to set it to when underclocking to 2933 and 2666.

RAM undervolting wont help much in reducing power consumption.
Anyway, I'm currently at 2933MHz at the standard 1.2v. With normal latencies, you should be able to archive something similar.

I'm not trying to reduce power consumption or anything so I just need to know what voltages to set them to so it's stable or whatever else, never really underclocked RAM before.

 

[kapone32]

My BIOS doesn't adjust them automatically so that's why I'm asking here. Also no I'm not running on an fx on my main PC now.

Are you saying you don't have XMP profiles on your BIOS?

I think you just misunderstood my post. My RAM isn't 2933, it's 3000 stock, and I want to know what voltages to set it to when underclocking to 2933 and 2666.


I'm not trying to reduce power consumption or anything so I just need to know what voltages to set them to so it's stable or whatever else, never really underclocked RAM before.

All you have to do is enable the XMP profile and pick 2933 as the RAM speed. I doubt you will see a difference of any kind in terms of power draw. You will not see 1.2 volts at 2933 as that is only 67 away from the stock clock. BTW if you are on Ryzen it actually hurts performance to run at lower speeds. My thoughts are to leave the RAM as is and suck up the 2 cents a month premium for running at stock voltages.

 

[avrona]

Are you saying you don't have XMP profiles on your BIOS?


All you have to do is enable the XMP profile and pick 2933 as the RAM speed. I doubt you will see a difference of any kind in terms of power draw. You will not see 1.2 volts at 2933 as that is only 67 away from the stock clock. BTW if you are on Ryzen it actually hurts performance to run at lower speeds. My thoughts are to leave the RAM as is and suck up the 2 cents a month premium for running at stock voltages.

I do have XMP, I just thought that only worked with overclocking, not underclocking, so I'll try just to use that then to underclock.

 

[TheMadDutchDude]

XMP will run your modules at what they are rated at. You’re over complicating this for no reason, fella.

 

[avrona]

XMP will run your modules at what they are rated at. You’re over complicating this for no reason, fella.

I've never underclocked RAM before so I don't fully understand what needs to be done for it.

 

[kapone32]

I've never underclocked RAM before so I don't fully understand what needs to be done for it.

Just enable the XMP profile.

 

[avrona]

So I turned on XMP and then lowered the multiplier to 2666. Is that it?

 

[kapone32]

View attachment 127097
So I turned on XMP and then lowered the multiplier to 2666. Is that it?

Exactly as long as it boots you will be good.

 

[TheMadDutchDude]

Why not run it at 3000? I'm still so very confused...

 

[Lightofhonor]

Why not run it at 3000? I'm still so very confused...

Ryzen doesn't like 3000, so it normally goes to 2933.

I think the issue is/was he thought he needed to undervolt since it's downclocking. You don't need to undervolt, just leave it at 1.35v.

Maybe even try 1.4v and 3200

 

[TheMadDutchDude]

Yep, run it at 3200 with a slight bump in voltage if that's the case.

I haven't heard of 3000 being an issue, but I haven't bothered checking either.

 

[EarthDog]

Yeah... feels like half of a story. Did you try xmp and was it not stable? What's the whole story here?

What's the reason you want to use 2933? That is below the BASE spec of your CPU (which is 3200). AMD recommends 3600 speed, in fact.

As far as what voltage... who knows exactly. You can try lowering it to the suggested 1.3 and see if that works....but there isnt a cookie cutter setting. You'll have to make some effort to check and test for stability.

 

[biffzinker]

I've found out I can get away with 3200 MHz and 18-19-19-19-38 at 1.2v. Doesn't hurt to experiment with the settings.

 

[TheMadDutchDude]

Crank that voltage! C18 is mega loose at 3200.

 

[biffzinker]

Crank that voltage! C18 is mega loose at 3200.

I was messing around with how loose the timings have to be to run 3200 MHz with the voltage restricted to 1.2v. Timings are tighter than a new set of Crucial DDR4-3200 though.

The timings can be tightened to C15-17-17