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LOSTCIRCUITS	SHORTCUTS: Out of Copenhagen Test Configurations Memory Subsystem Power Consumption 3D Rendering Energy Efficiency Cinebench AV Encoding: DVD-Shrink, DrDivX, MainConcept AV Encoding: Virtualdub / DivX and SSE4 Gaming: 3DMark '06 FarCry F.E.A.R. Overclocking Final Words Give Us Some Feedback on this Review
Intel's Penryn Core Turns Yorkfield at 3.0 GHz P1266 at 45nm, 12 MB L2 Cache, and SSE4 Instruction Set
(Review by MS, October 28, 2007)

Energy Efficiency

One of the most important improvements of the "Penryn" core was the reduction of leakage currents resulting in an expected dramatic reduction of overall power consumption. We originally speculated that the idle power consumption of the Penryn (2 cores) die might be as low as around 10W at idle in Windows with approximately 35 W at max load (based on 3.6 GHz top operating frequency).

Windows Idle Power Consumption

The quad core Yorkfield drew 21 W at idle in Windows XP (and Vista) as measured before the VRM. Given a maybe 70% efficiency of the motherboard VRM, this would put the raw CPU power consumption at around 14 W or less.

Max Load Power Consumption

The quad core Yorkfield drew 68.4 W under full load, again, measured before the VRM. At an estimated 70% efficiency of the motherboard VRM, this puts the raw CPU power consumption at around 50 W.

Note that the ASUS P5K3 is somewhat notorious for an allegedly very inefficient VRM. However, the measurements for the QX6850 were taken on the same board in an identical configuration and procedure and there is no way of arguing against the fact that the Yorkfield processor only draws about 1/2 of the power of its Kentsfield predecessor under full load and even less in idle, which is consistent with the greatly reduced current leakage on the P1266 process-manufactured die.

(BX80557E6300)

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