i have an 8 GB DDR4 and a 2 GB DDR4 ram modules in my laptop, i can easily run my everyday things with 8 GB, battery life is tricky on my Acer aspire E5-553 with Linux mint on it, i get between 3-4 hrs max, if i remove the 2 GB module, how much gain in battery life , should i expect? I've read that DDR4 runs on 1.2 volts but i don't know what it means to power consumption in terms of my 45wh, 16v, 4 cell lithium ion battery.
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1You could just take the Ram out and test it but I'm taking a guess that the battery use difference will be negligible if at all noticeable.– TiOCommented Aug 9, 2017 at 8:13
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There will be no difference or such a small difference you wouldn't be able to measure it (few seconds to perhaps a few minutes) but even that difference would be depending on the old of the CPU during that testing phase not because of how much memory you have installed or how much memory was "used"– RamhoundCommented Aug 9, 2017 at 11:41
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it seems that i should rather keep it– techvish81Commented Aug 9, 2017 at 15:22
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1 Answer
At a guess, a your 2 gig DIMM will use in the order of 1.5 watts.
The figure I've calculated seems unreasonably high, but I get a figure in the order of magnitude of 10% extra battery life. I get this as follows:
1.5 watts x 3 hours runtime = 4.5 watt hours, or about 10% of the rated capacity of your battery.
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That isn't how you calculate Wh typically. A memory module requires 1.5 volts not 1.5 watts. If a single 2 GB module requires 1.5 Wh then I am deeply concerned for my phone and every mobile device in existence because they will never have more memory then they already have. You would have to know the resistance of the module to calculate wattage.– RamhoundCommented Aug 9, 2017 at 11:36
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@ramhound No, a DDR4 memory module apparently and surprisingly requires in the order of 1.5 watts from what I discovered while researching - otherwise I'd be great full if you could find the error in my logic (I know the difference between watts, amps, volts, resistance)- You raise a good point but cellphones do not use DDR, and also a 4 gig dimm uses similar power to an 8 gig one -(and desktop similar to SODIMM). If my answer IS wrong I'd be very interested in why - but it's not because I confused watts– davidgoCommented Aug 9, 2017 at 19:25
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DDR4 requires 1.5 Watts? Samsung's documentation says 1.2 volts.– RamhoundCommented Aug 9, 2017 at 19:34
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@ramhound - I could not find anything specific to 2GB memory, but according to Toms Hardware for 1.2 volt DDR4 type memory, yes - that order off magnitude - tomshardware.com/reviews/…– davidgoCommented Aug 9, 2017 at 23:44