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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)

Overclocking

Overclocking is usually not the strongest aspect of Intel's quad core processors but especially in the case of a new die, it is certainly of interest to look at how far it can be pushed within the envelope of allowed settings. According to the data sheet, Intel allows core and termination voltage up to 1.45 V, which is where we drew the line. At default (1.3VCC), we pushed the 3GHz sample to 3.9 GHz without running into any stability issues. Increasing the core voltage to 1.45 V allowed us to push a bit higher, namely to 4.2 GHz at which frequency Orthos was running completely stable. Above 4.2 GHz, the system showed a few stability problems but we still managed to get into Windows and run Prime95 as fast as 4.4 GHz.

Particularly noteworty are the core temperature readings we saw using CoreTemp.

At idle, the core temperatures were just above ambient RT. Hint: it was not the Intel stock cooler we were using!

Prime95 was running to get the CPU out of the C1 state and running at full frequency. Note the 11 x multiplier used, which is available only in unlocked samples, even though the core does support multipliers up tp 15x as mentioned on the first page of this article.

(BX80557E6300)

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