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Depending on the distance to the server, you may want to consider SFP+ Twinax cables, they are considerably cheaper than buying optics and can reach up to 10 metres.
The problem with Twinax is there can be compatibility issues when going from one manufacturer to another. I'd have to look at that exact application but nevertheless, here is what I would want the world to know ...
What the OEM cannot do, many times can be done aftermarket. We have Twinax solutions where we can encode EACH end of the cable specifically to whatever hardware you are connecting to. For instance, HP to Cisco, Juniper to Extreme, Cisco to Juniper, etc.
You can obviously do compatible transceivers on each end with fiber, and there is nothing wrong with that. I would say it is a matter of "armor" / rigidity, cost, and at the end of the day, preference.
As a point of reference to cost, here is a Twinax from Cisco to Cisco in 10G SFP+
At the speed of light!