Get on Amazon.com : http://www.amazon.com/gp/product/B00HLDEZVO?tag=clothingattes-20

Tripp Lite QSFP to QSFP 40Gb Passive DAC Copper Infiniband Cable 3M (10-ft.) (N282-03M-BK)

Meets or Exceeds strict 40-Gigabit Ethernet 40GBase-CR4 standards
QSFP to QSFP 30AWG SFF-8436 compliant cable and connector
Up to 103125 Gbps transfer rate per channel 40Gb aggregate
Multi-platform support for 40Gb SAS Fiber Channel and SONET
Zinc die-cast QSFP connectors with Pull-to-Release latching
Lower port cost and reduced power budget vs Fiber Optics