Lenovo C315 Touch Screen All-in-One PC

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TEST RESULTS

AC Power Draw

System Power
Test State
EeeTop ET2203
ThinkCentre A70Z
Lenovo C315
Off
1W
1W
2W
Sleep
2W
1W
4W
Idle
(screen off)
17W
25W
47W
Idle
(typical brightness)
33W
(65/100)
40W
(40/100)
56W
(5/7)
Idle
(maximum brightness)
39W
49W
61W
x264 Playback
44W
60W
61W
CPU Load
70W
83W
69W
CPU + GPU
Load
84W
83W
83W

Despite the use of laptop hardware and a low TDP desktop processor, the Lenovo C315 idles using significantly more power than similar all-in-one PCs we've tested. It drew 16W more than the ThinkCentre A70Z which is based on Intel desktop hardware but without discrete graphics, and 23W more than the Asus EeeTop ET2203 which is based on Intel mobile hardware. Though the processor runs at a paltry 1.6GHz, with a discrete graphics card, the C315 had no trouble with high definition video. It played a 1080p x264-encoded clip with just 18% CPU usage while consuming 61W from the wall. When placed on heavy load, the C315 was comparable to the ET2203 with regards to power consumption.


Lenovo C315 on load: CPU-Z screenshot.


Lenovo C315 idle: CPU-Z screenshot.

The cause of the high idle power consumption appears to be the CPU operating voltage. Though Cool'n'Quiet and C1E were enabled, the CPU voltage did not change between power states. When idle the clock speed dropped to 800 MHz, but in our experience this does little for power savings when not accompanied by a reduction in core voltage.

Performance

Performance Benchmarks
Model
Lenovo ThinkPad Edge 13 (laptop)
Lenovo C315
Asus EeeTop ET2203
CPU
SU7300 1.3GHz
X2 250u 1.6GHz
T6600 2.2GHz
GPU
X4500MHD
HD 4530
HD 4570
RAM
2x2GB
2x2GB
2x2GB
HDD
320GB 5400rpm
500GB 7200rpm
500GB 5400rpm
Boot-up*
1:25
1:02
1:14
NOD32
11:30
10:43
10:05
WinRAR
5:35
6:26
4:20
iTunes
8:04
8:06
4:59
TMPGEnc
10:47
10:27
6:24
PCMark05
3196
3839
4953
3DMark05
1616
5440
5950
3DMark06
907
2736
3176
*start button to when the desktop loads fully

In our real world benchmarks, the C315 performed very similarly to the ThinkPad Edge 13, a laptop powered by the Core 2 Duo SU7300 processor. The SU7300 is a low power chip that is slow even by notebook standards. The Core 2 Duo T6600 in the EeeTop gives it a pretty good edge over the other two machines. The T6600 is more representative of mainstream notebook performance. Needless to say, a typical desktop CPU would cream all three of these systems.

Subjectively the C315 was not noticeably slow, as is the case with most dual core PCs. The numbers don't lie though — it is the slowest non-Atom desktop we've tested. As a general purpose PC, it definitely fits the bill, but for demanding jobs like video encoding, it will take a lot longer to complete than your typical desktop or all-in-one.



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