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Power Consumption

Pentium G850, G840 and G620 processors as well as Core i3 for LGA1155 formally belong to solutions with 65 W TDP. However, in reality they have lower frequencies and do not support Hyper-Threading and therefore, should be more energy-efficient. Let’s check it out.

The graphs below show the full power draw of the computer (without the monitor) measured after the power supply. It is the total of the power consumption of all the system components. The PSU's efficiency is not taken into account. The CPUs are loaded by running the 64-bit LinX 0.6.4 utility. We enabled all the power-saving technologies for a correct measurement of the computer's power draw in idle mode: C1E, AMD Cool'n'Quiet and Enhanced Intel SpeedStep.

In idle mode Pentium G850, G840 and G620 processors consume about the same as other CPUs for LGA1155 and LGA1156 systems. However, all processors featuring an integrated graphics core lose to their simpler counterparts used in LGA775 and Socket AM3 platforms.

However, it is not the final verdict yet. Like other processors with Sandy Bridge microarchitecture, Pentium G850, G840 and G620 can lower their power consumption in idle mode. In order to accomplish this you will need an Intel P67 based mainboard. These mainboards can disconnect integrated graphics from the power supply completely, which will allow lowering the power consumption by about 4-5 W.

The new Pentium processors proved to be the most energy-efficient solutions among CPUs that do not belong to the specific energy-efficient product series. In other words, they would be a pretty good choice in terms of performance-per-watt and may be really desirable for compact and quiet systems.

If we continue in this direction, we could probably assume that Pentium G850, G840 or G620 could easily become a great alternative to the 35-watt Core i3-2100T, which has proven to be an excellent choice for HTPCs.

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