Intel Xeon Quad Core (Gainestown / Nehalem):

Intel Xeon E5502 1.86 GHz (4.8 GT/s, 800 MHz DDR3, 4MB, no HT, no TurboBoost, 80W, dual core only) Intel Xeon E5504 2.00 GHz (4.8 GT/s, 800 MHz DDR3, 4MB, no HT, no TurboBoost, 80W) Intel Xeon E5506 2.13 GHz (4.8 GT/s, 800 MHz DDR3, 4MB, no HT, no TurboBoost, 80W) Intel Xeon L5506 2.13 GHz (4.8 GT/s, 800 MHz DDR3, 4MB, no HT, no TurboBoost, 60W) Intel Xeon E5520 2.26 GHz (5.8 GT/s, 1066 MHz DDR3, 8MB, HT, TurboBoost, 80W) Intel Xeon L5520 2.26 GHz (5.8 GT/s, 1066 MHz DDR3, 8MB, HT, TurboBoost, 60W) Intel Xeon E5530 2.40 GHz (5.8 GT/s, 1066 MHz DDR3, 8MB, HT, TurboBoost, 80W) Intel Xeon E5540 2.53 GHz (5.8 GT/s, 1066 MHz DDR3, 8MB, HT, TurboBoost, 80W) Intel Xeon X5550 2.66 GHz (6.4 GT/s, 1333 MHz DDR3, 8MB, HT, TurboBoost, 95W, not available on E2812W) Intel Xeon X5560 2.80 GHz (6.4 GT/s, 1333 MHz DDR3, 8MB, HT, TurboBoost, 95W, not available on E2812W) Intel Xeon X5570 2.93 GHz (6.4 GT/s, 1333 MHz DDR3, 8MB, HT, TurboBoost, 95W, not available on E2812W) Intel Xeon W5580 3.20 GHz (6.4 GT/s, 1333 MHz DDR3, 8MB, HT, TurboBoost, 130W, not available on E2812W)

Intel Xeon Quad Core (Harpertown):

Intel Xeon E5405 2.0 GHz (1333 MHz, 2X6 MB) Intel Xeon E5410 2.33 GHz (1333 MHz, 2X6 MB) Intel Xeon L5410 2.33 GHz (1333 MHz, 2X6 MB) Intel Xeon E5420 2.5 GHz (1333 MHz, 2X6 MB) Intel Xeon L5420 2.5 GHz (1333 MHz, 2X6 MB) Intel Xeon E5430 2.66 GHz (1333 MHz, 2X6 MB) Intel Xeon L5430 2.66 GHz (1333 MHz, 2X6 MB) Intel Xeon E5440 2.83 GHz (1333 MHz, 2X6 MB) Intel Xeon E5450 3.0 GHz (1333 MHz, 2X6 MB) Intel Xeon X5450 3.0 GHz (1333 MHz, 2X6 MB) Intel Xeon X5460 3.16 GHz (1333 MHz, 2X6 MB) Intel Xeon E5462 2.8 GHz (1600 MHz, 2X6 MB) Intel Xeon E5472 3.0 GHz (1600 MHz, 2X6 MB) Intel Xeon X5470 3.33 GHz (1333 MHz, 2X6 MB) Intel Xeon X5472 3.0 GHz (1600 MHz, 2X6 MB) Intel Xeon X5482 3.2 GHz (1600 MHz, 2X6 MB) Intel Xeon X5492 3.4 GHz (1600 MHz, 2X6 MB)