DDR4 DIMMs and System Power Consumption – We Tested

[Patrick Kennedy]

We tested a low power 1U system with 16x and 4x DDR4 DIMMs to see the power consumption impact of using fewer RDIMMs in a server

The post DDR4 DIMMs and System Power Consumption – We Tested appeared first on ServeTheHome.

Related posts:

1. Intel Avoton / Rangeley Power Consumption – Real World C2750 Samples Tested
2. DDR4-2133 versus DDR4-2400 Memory – STREAM benchmarks using Xeon D
3. Intel Core i3-530 and Supermicro X8SIL-F Power Consumption (plus Xeon X3440)
4. Single or Redundant PSUs – Impact on Power Consumption

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[pro_lamer]

FWIW:I just got hands on an X10DRL-I-O with a single Crucial 32GB LRDIMM 2666MHz (CT32G4LFD4266) CL19 running @2133MHz CL15 (because the CPU is a single Xeon E5-2650Lv3) and the CPUID HWMonitor shows 12W usage for the memory "package". The memory usage is not heavy - I'm stressing the CPU with Intel processor diagnostic tool...

It would mean 12W per 32GB in this case. Edit: a bit more than in Patrick's test (where: 27W/96GB=9W per 32GB). IIRC Patrick's energy measurements referred to energy from the wall (or rather: energy "entering" the PSU) so my results are even a bit worse.

Sent from my phone

 

[Evan]

The older Simms like to 8GB ones are also on a bigger process node, somewhere in the life of ddr4 at least Samsung went to a newer smaller node.
Anyway 2w per dimm is seeming reasonable for sure, I know size also makes a difference but very rough rule of thumb type calculations.

On the other hand another data point..
https://www.servethehome.com/supermicro-a2sdi-8c_-hln4f-review/
@Patrick review of the Super Low power c3000 system with 4 x 16gb rdimm idles at OS level with 14w, so 2w per dimm would be half the usage, even using that cpu and ram it’s still some how not seeming like those rdimms are using anything like the old 8GB 2133mhz rdimms used in the test done now.

 

[pro_lamer]

FWIW:

I changed the DIMM to a 64GB version (CT64G4LFD4266), ran memtest64 (I stressed the memory this time) and the HWmonitor indicated 26W top consumption for the DRAM.