dram bus voltage

pluto2

Prominent
May 8, 2017
5
0
510
Brand new to the forum here

I just installed new ram into my motherboard (Asus Rampage III). Before I installed the new ram I made sure everything was on auto in my bios. I was unsure if my old ram was 1.65v or 1.5v and assumed it was 1.65 because my DRAM BUS was running at 1.66ish on auto.

The new ram I installed is rated for 1.5volts and boots fine and everything seems to be okay. But when I went into my BIOS I saw that my DRAM BUS is still running at around 1.66 with it being set to auto.

Am I currently throwing way too much voltage through my new ram (is DRAM BUS voltage = to ram voltage?)? I really don't want to risk damaging any of my components.

Happy to give more information about the system if that will help at all.
Here is the ram I purchased:
https://www.amazon.com/dp/B00J8E92C6/ref=twister_B01N2UT24F?_encoding=UTF8&psc=1

Thanks guys

-pluto
 
Solution


DDR3 SDRAM must be able to withstand up to 1.9 volts per JEDEC spec. 1.5 volts +/- 5% is the standard operating voltage which should be observed for maximum interoperability.

So no, you're not damaging it simply by driving it with 1.65 volts.
 
Solution

pluto2

Prominent
May 8, 2017
5
0
510
You're the bomb, thank you very much. I upgraded from 12 gigs to 24 gigs, upon doing so my Row Refresh Cycle Time went from 107 to 174. I tried to do some researching on it and it seems to be only an interest among enthusiasts. Do you happen to know if there is any real world difference between those two values? Mostly use the computer for gaming with some 3D rendering here and there.
 


tRFC is directly proportional to the density of the DRAM chips used. It's the length of time that the rank must remain unselected after a refresh cycle is initiated.

In theory, memory controllers should be able to support a unique tRFC for each rank but this tends to get complicated, so most simply take the maximum.

In terms of performance, it's not significant unless you've got only one or two ranks installed.