This isn't true.
For example, AMD Threadripper, which is the high-end workstation brand, is currently two generations behind AMD's desktop CPUs.
Similarly, Intel often launches new microarchitectures on laptops first, desktops second, servers even later. For example, Intel Xeon Granite Rapids has started rolling out, and uses Redwood Cove as its microarchitecture. The consumer variant of that is Meteor Lake, which rolled out for laptops last year, and is already obsolete.
You’re right. Honestly I forgot about Threadripper because for a while there were rumors that AMD abandoned it, and I haven’t kept up with PC CPUs. Nvidia has released their flagship and upper tier cards first for the past few generations, though.
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