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Mac Pro 2011 "Sandy Bridge E" everything we know
CPU:
The Sandy Bridge-E based "Intel Xeon E5"
E5-1600 Series for Single Socket
E5-2600 Series for Dual Socket

Known Configuration
UP Processor E5-1600
Xeon E5-1620 / 4 Core (8 Threads) / 3.6 GHz / L3 10 MB / TDP 130 Watt
Xeon E5-1650 / 6 Core (12 Threads) / 3.2 GHz / L3 12 MB / TDP 130 Watt
Xeon E5-1660 / 6 Core (12 Threads) / 3.3 GHz / L3 15 MB / TDP 130 Watt

DP Processor E5-2600
Dual Core
Xeon E5-2637 / 2 Core (4 Threads) / 3.0 GHz / L3 5 MB / DDR3-1600 / TDP 80 Watt

Quad Core
Xeon E5-2603 / 4 Core (4 Threads) / 1.8 GHz / L3 10 MB / DDR3-1066 / TDP 80 Watt
Xeon E5-2609 / 4 Core (4 Threads) / 2.4 GHz / L3 10 MB / DDR3-1066 / TDP 80 Watt
Xeon E5-2643 / 4 Core (8 Threads) / 3.3 GHz / L3 10 MB / DDR3-1600 / TDP 130 Watt

Hex Core
Xeon E5-2620 / 6 Core (12 Threads) / 2.0 GHz / L3 15 MB / DDR3-1333 / TDP 95 Watt
Xeon E5-2630 / 6 Core (12 Threads) / 2.3 GHz / L3 15 MB / DDR3-1333 / TDP 95 Watt
Xeon E5-2640 / 6 Core (12 Threads) / 2.5 GHz / L3 15 MB / DDR3-1333 / TDP 95 Watt
Xeon E5-2667 / 6 Core (12 Threads) / 2.9 GHz / L3 15 MB / DDR3-1600 / TDP 130 Watt
Xeon E5-2630L / 6 Core (12 Threads) / 2.0 GHz / L3 15 MB / DDR3-1333 / TDP 60 Watt

8 Core
Xeon E5-2650 / 8 Core (16 Threads) / 2.0 GHz / L3 20 MB / DDR3-1600 / TDP 95 Watt
Xeon E5-2660 / 8 Core (16 Threads) / 2.2 GHz / L3 20 MB / DDR3-1600 / TDP 95 Watt
Xeon E5-2665 / 8 Core (16 Threads) / 2.4 GHz / L3 20 MB / DDR3-1600 / TDP 115 Watt
Xeon E5-2670 / 8 Core (16 Threads) / 2.6 GHz / L3 20 MB / DDR3-1600 / TDP 115 Watt
Xeon E5-2680 / 8 Core (16 Threads) / 2.7 GHz / L3 20 MB / DDR3-1600 / TDP 130 Watt
Xeon E5-2690 / 8 Core (16 Threads) / 2.9 GHz / L3 20 MB / DDR3-1600 / TDP 135 Watt
Xeon E5-2687W / 8 Core (16 Threads) / 3.1 GHz / L3 20 MB / DDR3-1600 / TDP 150 Watt
Xeon E5-2650L / 8 Core (16 Threads) / 1.8 GHz / L3 20 MB / DDR3-1600 / TDP 70 Watt

Other Known Specification
- Socket R (2011 pins)
- 2 QPI links
- 40 PCI-E 3 Lanes
- 4 DMI 2.0 Lanes
- Quad-channel DDR3 memory controller
- Max 96 GB DDR3 Per CPU

Chipset:
- Intel X79
- Codenamed Patsburg
- PEG 2x16 up to 4x8
- Intel Rapid Storage Enterprise 3.0
- SATA Total (Max for 6GB/S) 14(10)
- Integrated Gigabit Ethernet MAC (Lewisville PHY)

GPUs:
Possible Candidate (I put the bet on ATI).
- ATI Radeon HD 6970 <- (ATI Replacement for 5870)
- ATI Radeon HD 6870 <- (ATI Replacement for 5770)

100% in 2011 Mac Pro:
- Thunderbolt Port

Other Rumors:
- Late July / Early August Launch along with Lion.
- Stackable / Rackable Newly designs case.
- May be use special Intel CPU

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