8 X 8GB or 4 X 16GB for energy efficiency

Discussion in 'Processors and Motherboards' started by adnan, Aug 31, 2017.

  1. adnan

    adnan Member

    Joined:
    Apr 23, 2017
    Messages:
    80
    Likes Received:
    5
    Hello

    Can any experts comment on this. Installing 64GB RAM into a machine, will 4 X 16GB use less energy then 8 X 8GB and if so, is there much difference.
     
    #1
  2. BlueFox

    BlueFox Well-Known Member

    Joined:
    Oct 26, 2015
    Messages:
    743
    Likes Received:
    286
    Generally fewer DIMMs results in lower energy usage. A difference of 4 DIMMs is not significant however.
     
    #2
  3. niekbergboer

    niekbergboer Active Member

    Joined:
    Jun 21, 2016
    Messages:
    110
    Likes Received:
    36
    Larger DIMMS are generally a bit more expensive per Gigabyte than their smaller counterparts. The question is how that compares to the electricity cost saved over the expected time that you'll use the server.

    Where I live, and assuming a 4-year lifetime, the break-even point is some $8/Watt (purchase price difference per 24/7 Watt of per difference).

    Sadly, it's generally not worth it going for low-power parts.
     
    #3
  4. BLinux

    BLinux cat lover server enthusiast

    Joined:
    Jul 7, 2016
    Messages:
    2,464
    Likes Received:
    896
    using fewer DIMMs will usually save *some* energy. in DDR2 days, I measured quite the difference. also, going with lower voltage memory will also save a few watts here and there. the other thing i discovered recently is that at least with the DDR3 I was testing, at idle when there isn't much RAM activity, installing 2x DIMMs vs 16x DIMMs made 0 watt difference at idle - i didn't test further, but i expect there to be a difference if i ran a RAM benchmark. so, if your system is sitting idle a lot, it might not matter at all and not worth the investment.

    any power savings in this area is minimal though. if your goal is to squeeze every bit of lower wattage and you've already addressed everything else, then go for it. i found 16GB PC3L for pretty cheap ($30-35 ea.) so I went with 16GB DIMMs anyway.
     
    #4
  5. BlueLineSwinger

    BlueLineSwinger Active Member

    Joined:
    Mar 11, 2013
    Messages:
    149
    Likes Received:
    54
    Regardless of possible energy consumption concerns, assuming it's economically viable, I'd rather go with fewer, larger DIMMs in order to make make possible expansion later simpler and cheaper.
     
    #5
  6. Evan

    Evan Well-Known Member

    Joined:
    Jan 6, 2016
    Messages:
    2,969
    Likes Received:
    469
    All depends what the dimms are as well. For example I see some new generation ddr4 rdimm in 16gb that's now single rank and the new smaller process node, I am sure they would use less than the older larger process that's 2R and more packages.
     
    #6
Similar Threads: 16GB energy
Forum Title Date
Processors and Motherboards What board/system takes this RAM? (DDR3L 12800 16GB ECC Reg SODIMM 4Rx8) Jun 8, 2019
Processors and Motherboards 16GB DDR3-1066 vs 32GB DDR3-1866 Jun 22, 2018
Processors and Motherboards what's a decent ddr3 16gb ecc price these days? Jul 20, 2017
Processors and Motherboards SuperMicro MB C612 with 16GB ECC UDIMM memory Oct 24, 2016
Processors and Motherboards Crucial 16GB DDR4-2400 ECC UDIMM Nov 15, 2015

Share This Page