Any chance for new processors to fit in 2013 nMacPro (6,1). The 6.1 list is fairly short and the options that actually bump up the speed over stock are slim. Unless you are upgrading from a 4 core cpu to a 6, 8, 10 or 12 core it doesn't look like it is a good investment at 2 grand for a new chip.
I think it is a general truism that when you are already near the top for processor performance, an upgrade to the absolute top doesn't gain you much and can be quite costly. (You might be able to lower the effective cost if there is demand for your current processor and you sell it.)
We have seen in the past that newer processors became available for the 1,1 and the 4,1 via unofficial firmware updates to 2,1 and 5,1. However, those were for socket-compatible processors. I don't see how the same scenario could possibly play out for the 6,1. Even if the 7,1 Mac Pro is released tomorrow, it will undoubtedly use a different socket and have an incompatible firmware.
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