Power And Efficiency
Because games represent the performance level of complete platforms in today’s test, we’ve used these to determine power and efficiency differences. We begin with power consumption.
Remember what we said about this particular Core i5-750 CPU: its overclocking headroom is lower than what we've found to be average, requiring higher-than-average voltage to reach 4 GHz. A typical Lynnfield-based processor would reach these settings at 1.35 V, saving around 20 W at full load.
The remaining 30 W difference between it and the newer processor is mostly due to die process, where the 32 nm core required only 1.20 V to reach the same frequency. The new chipset appears to save a measly 1 W of power, though difference in motherboard design could have made that number smaller or bigger than it should have been.
The new CPU gives the P67 Extreme6 a modest performance boost, while the new chipset had little overall effect on Core i5-750 performance.
An efficiency improvement of less than 1% isn’t helping ASRock make the case for choosing its P67 Transformer over its P55 predecessor, while much larger gains for the new processor will certainly help Intel make its case for a total platform upgrade.