Well, can't agree with socket chart.
Let's see (long run)
AMD&Intel: Socket 7 (intel up to some 266MHz?, AMD up to 550MHz)
Intel Slot 1 - with FCPGA adapters up to some 1200MHz?
AMD SlotA - with socketA adapters up to some 1600MHz?
PPGA s370 ~ 600MHz?
FCPGA (coppermine) 1100MHz
FCPGA2 (tualatin) 1500MHz?
Guess what...PPGA/FCPGA/FCPGA2 were the same socket (s370).
Now...SocketA ranged from 800MHz Durons to 2GHz AthlonXP 3200+
P4 start was with socket 423, but intel soon abandoned it for 478, however there were some adapters for some CPUs which allowed s478 CPUs to work on s423 mobos.
AMD with A64 introduced single channel DDR platform on s754. Later in 939 there was enhancement with dual channel and dual core. But then DDR2 appeared with quite low prices - so they moved to AM2.
Intel brought LGA775, but most chipsets for Prescott couldn't handle Core 2, later C2D FSB800MHz chipsets couldn't handle FSB1066 and 1333MHz C2D/C2Q cpus. And now we get LGA1366, 1156 and some more for the same familly. Well, I guess intel is more disruptive than AMD. I can put PhenomII 810 AM3 to my AM2 mobo on M1695+NF3, some NF3 ASRock users can do that too. AM2/2+/3 is on the best way to be worthy SocketA successor.