“The AMD64 Logo Program allows leading software and hardware developers to signify their support for the extraordinary value of simultaneous, native 32- and 64-bit computing on the AMD64 platform,” said Rich Heye, vice president and general manager of AMD's Microprocessor Business Unit. “The AMD64 logo indicates that end users can continue using their software and hardware today and migrate to next-generation technology at their own pace.”
“The AMD64 logo tells you that you're getting the best of both worlds,” said Tim Sweeney, founder and president of Epic Games. “Epic Games’ port to AMD64 gives you the ability to run 64-bit applications that can take advantage of an incredible amount of memory, virtual address space, and double the number of registers of previous CPU's at the same time you get high-performance compatibility with existing 32-bit applications.”
Some nice logos, but not that refreshing in my opinion, and I don't know why but they look 'cheap' to me. But the AMD64 logos look alot 'AMDish', so that anyone directly will associate them with AMD.