Intel X3350 Design Guide - Page 62

Thermal Solutions Table 7-3. TCONTROL Guidance 85W 85W 65W 60W 65W 48W 30W 35W 23W TDP TCONTROL Guidance -18 Comment Intel® Xeon® processor EC5549 -16 Intel® Xeon® processor EC5509 -10 Intel® Xeon® processor EC3539 -20 Intel® Xeon® processor LC5528 -14 Intel® Xeon® processor EC5539 -24 Intel® Xeon® processor LC5518 -8 Intel® Celeron® processor P1053 -26 Intel® Xeon® processor LC3528 -26 Intel® Xeon® processor LC3518 7.6.2 7.6.3 PECI Averaging and Catastrophic Thermal Management By averaging DTS over PECI, thermal solution failure can be detected and a soft shutdown can be initiated to help prevent loss of data. Thermal data is averaged over a rolling window of 256mS by default (X=8): AVGN = AVGN-1 * (1 - 1/2X) + Temperature * 1/2X Using a smaller averaging constant could cause premature detection of failure. The Critical Temperature threshold generally triggers somewhere between PECI of 0.75 and -0.50. To avoid false shutdowns, initiate soft shutdown at -0.25. Since customer designs, boundary conditions, and failure scenarios differ, above guidance should be tested in the customer's system to prevent loss of data during shutdown. Intel® Turbo Boost Technology Intel® Turbo Boost Technology (Intel® TBT) is a new feature available on certain processor SKUs that opportunistically, and automatically, allows the processor to run faster than the marked frequency if the part is operating below its power, temperature and current limits. Hfaecatotsrisnkthpaet rcfaonrmimanpcaect(ltohweearmΨoCuAnatsodf eIsncterilb®edTBinT Section 7.5.1) is one of several frequency benefit. Intel® TBT performance is also constrained by ICC, and VCC limits. August 2010 Order Number: 323107-002US Intel® Xeon® Processor C5500/C3500 Series and LGA1366 Socket Thermal/Mechanical Design Guide 62