System Power Consumption / Temperature Testing
System Power Consumption
Our power consumption numbers are broken down into two categories: one which simply stresses all of the CPU cores with WPrime and another which puts a high amount of load on both the CPU cores and the IGP. The latter will only be included if a given processor includes a dedicated internal graphics sub-processor.
For the CPU power consumption test, we use the standard testing system (with an NVIDIA GTX 670 installed) and wait until the system and discrete GPU are at idle speeds in order to log the idle power consumption. After this, WPrime 1024M is looped for 15 minutes while the power consumption is logged with a calibrated power meter to determine the peak watts.
Please note that after extensive testing, we have found that simply plugging in a power meter to a wall outlet or UPS will NOT give you accurate power consumption numbers due to slight changes in the input voltage. Thus we use a Tripp-Lite 1800W line conditioner between the 120V outlet and the power meter.
The power consumption of both the 4930K and 4820K met with expectations for processors using Intelís 22nm technology. They are significantly more efficient than their predecessors while also requiring less power than the 4960X.
In order to test temperatures, we set all processors on a loop of Prime95ís Blend Test for 25 minutes and logged the peak temperature core over that period of time using Intelís XTU 4.2 utility. Ambient temperatures were kept at a constant 24įC. For cooling, a Noctua NH-U14S with two 140mm fans was used.
Naturally, the lower power needs tend to translate directly into reduced heat production. The i7-4820K in particular has plenty of room for overclocking from a thermal perspective, though temperatures on any of these processors tend to shoot up dramatically when additional voltage is applied.
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