P55 RAM - Max safe voltages?

Invertigo · 19 Oct 2010 at 02:28

Basically, I'm lost as to where I stand on this right now. Initially Intel stated anything over 1.5V could damage the chip, then they decided 1.65V was fine, and since then I haven't paid attention.
Basically, what's the maximum voltage I should be running RAM at on a P55 chipset. I quite fancy trying to get a little more performance out of my Dominators

RJC · 19 Oct 2010 at 07:34

As far as I am aware 1.65v is the max ~ memory can be on running i system, weather this has changed recently I am not sure.

Basically I would not put my ram any higher than 1.65 / 1.66v

dazzerd · 19 Oct 2010 at 09:29

Latest from intel spec is 1.8 for ram on p55 (assuming the ram modules can cope).

Can't find the link but it's on the latest data sheet.

1Day · 19 Oct 2010 at 20:20

Yeah - rule of thumb just go to the ram vendors and see what they say is the max you can use. The Intel white papers can be downloaded directly from the Intel site.

Day to day stuff you should stay 1.65 if you possibly can.

Stevinchy · 22 Oct 2010 at 14:11

The intel spec does now say that the absolute max is 1.8v but this is the absolute max just like they say the absolute max vcore is 1.4v. The max voltage to stay in spec is 1.65 and it's best to stay within that. They also say to keep your dram voltage within 0.5v of your IMC/VTT voltage. The spec sheet is confusing on max IMC/VTT in table 7-4 it says the max is 1.40 but then in 7-6 it says the max is 1.15. Coincidentally 1.15 + 0.5v would give 1.65v which does lead me to believe that figure. That being said not many people can run ram at 1600 without going to about 1.2v.

I personally run at 1.67v on my ram and my VTT is over 1.2. I think anything under 1.7 would be fine but only time will tell. Remember to set your VTT to atleast 1.2 if you are going to run at 1.7 though. This will also help you stabilize the higher speeds I assume you are going for.

http://download.intel.com/design/processor/datashts/322164.pdf