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MB socket 775 Intel P45 (ATX,1333MHz,DDR 3 1333,ATI CrossFire,SB 7,1 ,GbElan, 2xPCIex16,eSATA,RAID,12x USB 2,0,IEEE 1934a.supporting Core 2Extreme CPU)

Form factor:  ATX (294.64 mm x 243.84 mm)
Processor:  
- Intel® Core™2 Extreme processor in an LGA775 socket
- Intel® Core™2 Quad processor in an LGA775 socket with
- Intel® Core™2 Duo processor in an LGA775 socket
- Intel® Pentium® Dual-Core processor in in an LGA775 socket
- Intel® Celeron® Dual-Core processor in an LGA775 socket
- Intel® Celeron® processor 400 sequence in an LGA775 socket

Memory: 4x 240-pin DDR3 SDRAM Dual Inline Memory Module (DIMM) sockets
DDR3 1333/1066/800 MHz DIMMs  - up to 16 GB

Chipset :Intel® P45 Express Chipset

Audio:  Intel® High Definition Audio subsystem in the following configuration:
8-channel (7.1) audio subsystem with five analog audio outputs and one optical S/PDIF digital audio output using the IDT 92HD73E audio codec

Video:  ATI CrossFire technology enables two ATI* graphics cards to work together for ultimate 3D gaming performance and visual quality
Full support of Next Generation ATI Crossfire

LAN support:  Gigabit (10/100/1000 Mbits/sec) LAN subsystem using the Intel® 82567LF Gigabit Ethernet Controller  

Peripheral interfaces:
- 12x USB 2.0 ports (6 back ports and 6 via headers)
-  6x Serial ATA 3.0 Gb/s ports, including 1 eSATA back port with RAID 0, 1, 5, 10 support
-  2x IEEE-1394a ports (1 external port, 1 internal header)
- Consumer IR receiver and emitter (via internal headers)
- 1x serial port via header

Expansion capabilities:
2x PCI Express* x1 bus add-in card connectors
3x PCI Express* x1 bus add-in card connectors