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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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