Testing DDR3 power consumption

Did a little power consumption testing of 6 different SODIMM DDR3 memory modules.

Here are the readings of a Kill-A-Watt kind of device, measuring Watts on a Fujitsu Lifebook s792.

– First reading is Watts at idle.
– Second reading is average Watts while running MemTest+ 5.01.

Hynix 1Rx8 2GB 10600-9-10-B1 
Idle: 9.6 / Load: 21.6 – 21.8

Samsung 2Rx8 2GB 10600S-09-10-F2
Idle: 9.6 / Load: 24.0 – 24.5

Kingston 2GB 2Rx8 PC3-10600S
Idle: 9.8 / Load: 23.2 – 23.7

Kingston 8GB 12800/1600MHz
(KVR16S11/8and lots of other seemingly random numbers, see pic 🙂
Idle: 9.8 / Load: 24.2 – 24.6

Hynix 4GB 1Rx8 PC3L-12800S-11-13-B4
Idle: 9.6 / Load: 23.5 – 23.9

Samsung 4GB 1Rx8 PC3L-12800S-11-12-B4
Idle: 9.7 / Load: 23.7 – 24.1

Some takeaways:

  • Size doesn’t seem to make much difference.
  • Even the count of memory chips doesn’t seem to matter much if at all, with most 4-chip-per-side modules pulling comparable watts with the 8-chip-per-side.
  • One exception being Hynix HMT325S6BFR8C, pulling ~2-3 Watts less under load.
  • Idle consumption is nearly identical

Test machine: Fujitsu Lifebook s792
CPU: Core i5 3230M
Battery: None
PSU: Toshiba 65W brick (sorry, I don’t have it any more to see the efficiency rating 🙂

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