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With 10G it's been the opposite, nobody was using copper so SFP+ is cheap. Only recently has copper 10G started to become common, a bit too late to be worth bothering with now and as there are no copper SFP+ Having new servers switch to copper instead of sfp is a nuisance

SFP+ Copper Twinax is another option for 10G to save on the transceivers

I should have been more precise with terms. The context here is doing less than 10G to support old cat5/6 installations. I didn't mention Twinax as if you could use that you'd not need a 2.5 or 5g standard nor have a problem with recent servers coming with 10GbaseT instead of sfp+ when all your previous ones are connected to a SFP+ only switch with fibre or twinax cables. brandon