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Former Intel CPU engineer details how internal x86-64 efforts were suppressed prior to AMD64's success
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
The 6000 series from AMD were so great because they picked the correct process node. Nvidia went with the far inferior Samsung 8nm node over TSMCs 7. Yet Nvidia still kept up with AMD in most areas (ignoring ray tracing).
The “disastrous” Fermi cards were also compute monsters. Even after the 600 series came out people were buying the 500 series over them because they performed so much better for the money. Instead of picking up a Kepler Quadra card in order to get double precision you could get a regular ass GTX 580 and do the same thing.