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BENCHMARKS
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Some quick comparisons, these are not scientific and your mileage may vary, do your own testing too!
XPS 13 9350 | i7-6560U | 8GB | SM951 256G NVME | Intel 8260 | FHD
Plasma 5.8.4 | X11 | Keyboard backlight off | Wifi Connected (2bars) | BT Connected (Headset) | 25% brightness | Idle
Kernel entries: i915.enable_psr=2
Linux-Mainline 4.9.0:
Time User Nice Sys Idle IO Run Ctxt/s IRQ/s Fork Exec Exit Watts
23:28:04 0.2 0.0 0.1 99.8 0.0 1 192 37 2 0 0 5.60
23:28:14 0.0 0.0 0.1 99.8 0.0 1 107 22 0 0 0 6.14
23:28:24 0.1 0.0 0.1 99.7 0.0 1 221 79 0 0 1 4.97
23:28:34 0.1 0.0 0.1 99.8 0.0 1 115 26 0 0 0 5.00
23:28:44 0.1 0.0 0.1 99.8 0.0 1 108 23 0 0 0 5.23
23:28:54 0.1 0.0 0.1 99.8 0.0 1 128 18 0 0 0 5.95
23:29:04 0.2 0.0 0.2 99.7 0.0 1 194 40 0 0 0 5.04
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------
Average 0.1 0.0 0.1 99.8 0.0 1.0 152.2 35.1 0.3 0.0 0.1 5.42
StdDev 0.0 0.0 0.0 0.1 0.0 0.0 44.9 19.4 0.7 0.0 0.3 0.45
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------
Minimum 0.0 0.0 0.1 99.7 0.0 1.0 106.6 18.5 0.0 0.0 0.0 4.97
Maximum 0.2 0.0 0.2 99.8 0.0 1.0 221.4 79.3 2.0 0.0 1.0 6.14
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------
Summary:
System: 5.42 Watts on average with standard deviation 0.45
Linux-NVME 4.9.0:
Time User Nice Sys Idle IO Run Ctxt/s IRQ/s Fork Exec Exit Watts
23:18:00 0.1 0.0 0.1 99.7 0.1 1 79 40 0 0 3 3.70
23:18:10 0.1 0.0 0.1 99.5 0.3 1 121 69 3 1 10 3.80
23:18:20 0.2 0.0 0.1 99.7 0.0 1 159 44 1 0 2 3.72
23:18:30 0.1 0.0 0.1 99.9 0.0 1 56 20 0 0 1 3.74
23:18:40 0.1 0.0 0.2 99.7 0.1 1 205 117 1 0 0 3.69
23:18:50 0.1 0.0 0.1 99.9 0.0 1 97 21 0 0 0 4.64
23:19:00 0.2 0.0 0.2 99.7 0.0 1 193 43 1 0 0 3.75
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------
Average 0.1 0.0 0.1 99.7 0.1 1.0 130.0 50.6 0.9 0.1 2.3 3.86
StdDev 0.1 0.0 0.0 0.1 0.1 0.0 53.1 31.3 1.0 0.3 3.3 0.32
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------
Minimum 0.1 0.0 0.1 99.5 0.0 1.0 55.9 20.2 0.0 0.0 0.0 3.69
Maximum 0.2 0.0 0.2 99.9 0.3 1.0 204.9 117.4 3.0 1.0 10.0 4.64
-------- ----- ----- ----- ----- ----- ---- ------ ------ ---- ---- ---- ------
Summary:
System: 3.86 Watts on average with standard deviation 0.32
A 1.56W gain when running idle, great! This is almost 30% power reduction for my device.