x86-64, also known as x64, x86_64, Intel 64, or AMD64, is the 64-bit version of the x86 instruction set. It was created by AMD in 2003 to support their Opteron processor line. Intel followed suit and released their own implementation later that year. This standardization allows for compatibility between both companies’ processors and operating systems.
This standardization also allows for compatibility between both companies’ processors and operating systems. Consequently, x64 is now a common architecture among 64-bit versions of Windows Vista, Linux distributions (including Ubuntu), Solaris 11, Mac OS X Leopard Server edition as well as the Xen hypervisor found in Oracle VM VirtualBox.
x86-64 is x86 instructions that have been extended to allow for 64-bits of memory space. This means the processor can access more data in one instruction and thus execute faster. Also, registers are increased from 16 bits to 32 or 40 bit wide. The new register size will accommodate larger program loops with fewer reloads of old values into the registers.
The CPU architecture of x86-64 allows it to run in 64-bit mode by default, but is also backward compatible with 32 and 16 bits.
Intel and AMD are the two primary manufacturers of X86-64 processors. The two technologies are labeled Intel 64 and AMD64 respectively. Today, nearly all processors have moved to a 64-bit architecture as they continue to grow in power with each new generation; this evolution has been facilitated by these companies who continually innovate their technology for both corporate enterprise customers as well as consumers alike!