Ethernet Products
Determine ramifications of Intel® Ethernet products and technologies
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Can I go network card to network card (no switch) with 40g? I have 10g nics in my computers now and during large file copies I'm maxing out the 10g (no switch). I'm currently doing 10g over cat6a and it is maxed.

JMill9
Beginner
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I was considering getting 2 of the XL710-QDA2 cards and a XLDACBL3 QSFP+ to QSFP+ Twinax Cable |

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VincentT_Intel
Moderator
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Hi JMill9, Thank you for posting in Intel® Ethernet Community. Back-to-Back connection between 2 XL710-QDA2 is supported. Please refer to the "Notes" section of the link below for additional information regarding the setup. https://www.intel.com/content/www/us/en/support/articles/000006051/network-and-i-o/ethernet-products.html Hope this helps. Best Regards, Vince T. Intel Customer Support Under Contract to Intel Corporation
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JMill9
Beginner
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Thanks. Best regards, Jim Millerick Complete Systems Design http://www.csdits.com<http://www.csdits.com/> 310.621.9567
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JMill9
Beginner
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Sorry – one more question – is there a noticeable difference between the performance of DAC and fiber? I hear CAT6 has more collisions or overhead or latency on 10gigabit (not sure what is true) than fiber. Best regards, Jim Millerick Complete Systems Design http://www.csdits.com<http://www.csdits.com/> 310.621.9567
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VincentT_Intel
Moderator
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Hi Jim, With your intended setup of back-to-back connection within 3 meters, there should be no difference between using DAC and fiber. Also, the XLDACBL3 cable features low cross-talk and pair-to-pair skew that maintains signal integrity. For more information about the features of Intel QSFP+ cables, kindly visit the link below. https://www.intel.com/content/www/us/en/ethernet-products/optics-cables/ethernet-qsfp-cables-brief.html Please let us know if there's other assistance needed. Best Regards, Vince T. Intel Customer Support Under Contract to Intel Corporation
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JMill9
Beginner
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Thank you very much! Best regards, Jim Millerick Complete Systems Design http://www.csdits.com<http://www.csdits.com/> 310.621.9567
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