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Architecture / Microarchitecture Microarchitecture Core Processor core ? Kentsfield Core steppings ? B0 (QMAQ) B1 (QQGV) B3 (QUPT, SL9UM) G0 (QXVD, SLACR) CPUIDs 6F4 (QMAQ) 6F7 (SL9UM) 6FB (QXVD, SLACR) Manufacturing process 065 micron 582 million transistors Die size 286mm 2 Data width 64 bit The number of cores 4 The number of threads 4 Floating Point Unit Integrated Level 1 cache size ? 4 x 32 KB instruction caches 4 x 32 KB data caches Level 2 cache size ? 2 x 4 MB caches (each L2 cache is shared between 2 cores) Multiprocessing Uniprocessor Features MMX instructions SSE / Streaming SIMD Extensions SSE2 / Streaming SIMD Extensions 2 SSE3 / Streaming SIMD Extensions 3 SSSE3 / Supplemental Streaming SIMD Extensions 3 EM64T / Extended Memory 64 technology / Intel 64 ? VT / Virtualization technology ? NX / XD / Execute disable bit ? Low power features Enhanced SpeedStep technology ? Stop Grant state ? Halt state Extended Halt state Electrical / Thermal parameters V core ? 0.85V - 1.5V Maximum operating temperature ? 60.3°C Maximum power dissipation ? 155.25 Watt Thermal Design Power ? 105 Watt