Viewing page 4 of 7 pages. Previous 1 2 3 4 5 6 7 Next
CPU Power Consumption
The energy inefficiency noted earlier appear to be caused by the integrated
graphics. Switching to our CPU test platform with a discrete graphics card,
the i7-3770K used a mere 40W DC, closely resembling Sandy Bridge. H.264 video
playback was more frugal by 5W. The GeForce 9400GT used is an older card and
whatever workload is leftover for the CPU seems to be more efficiently handled
by the i7-3770K and i7-3960X.
Running our synthetic CPUBurn/Prime95 stress test, the i7-3770K actually used less than the i7-2600K but in a real life stress test, video encoding with HandBrake, the Ivy Bridge processor used 8W more. With all the hubbub about its improved transistor technology and lower TDP, our sample's thermal envelope seems fairly similar to Sandy Bridge.
Note: direct temperature comparisons between processors on different platforms may be inaccurate.
According to RealTemp, our Ivy Bridge sample hit an average core temperature of 45°C above ambient using a Scythe Kabuto cooler with its fan running at 800 RPM (note the i7-3960X was tested with an Intel liquid cooler with the same fan/pump speed). With load power consumption more or less in line with the i7-2600K, the temperature difference seems a little high.
In our Photoshop test, the i7-3770K came right out of the gate with a win, edging out the i7-2600K by two seconds, corresponding closely to the increase in clock speed.
The i7-3770K took our NOD32 test as well, slipping by the Sandy Bridge Extreme i7-3960 and using much less power doing so. It was on par with the Sandy Bridge chips in energy efficiency.
|Help support this site, buy from one of our affiliate retailers!|