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10g sfp cable compatibility issues

We have a cisco nexus 5020 10g.  This is mostly for our San, and vmware esxi servers isci.  That works great.  We just added two new Dell poweredge R710 with dell provided (no idea what the part number is) broadcom netxtreme II 57711 10 g cards each with 2 ports.

I have two different 10 g sfp cables.  I have a handful of cisco sfp-h10gb-cu3m and hp 10ge sfp+ 3m part number 487657-001.  In theory they are the same basic cable.  I have used both on 5 different hp servers no issues.

But now i have added the two new dells (they were cheaper) The hp cables do not work.  They do not get a link light.  I have swapped cables if i swap in an hp I can sometimes get a link but if i use a cisco i always get a link.  Sometimes if i switch around I can get a link light on an hp cable but after a reboot i get nothing again.
I know the easy answer is use the cisco cables only.  But there should be a reason why this is so.  Anyone else run into this or have a solution.
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jwguillory
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Les Moore
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Member_2_231077

I thought SFP+ copper cables were covered by a T11 minimum spec and were therefore interchangable.