The Elbrus 2000 (or e2k; Russian: Эльбрус 2000) is a Russian 512-bit wide VLIW microprocessor developed by Moscow Center of SPARC Technologies (MCST) and fabricated by TSMC.

It supports two instruction set architectures (ISA):

• Elbrus VLIW
• Intel x86 (a complete, system-level implementation with a software dynamic binary translation virtual machine, similar to Transmeta Crusoe)

Thanks to its unique architecture the Elbrus 2000 can execute 20 instructions per clock, so even with its modest clock speed it can compete with much faster clocked superscalar microprocessors when running in native VLIW mode.^[1][2]

For security reasons the Elbrus 2000 architecture implements dynamic data type-checking during execution. In order to prevent unauthorized access, each pointer has additional type information that is verified when the associated data is accessed.^[3]

• Natively, running directly on Elbrus ISA:
  • Linux
  • Sukhoi OS RV BagrOS-4000, ARINC 653 and POSIX real-time OS. A replacement for foreign RTOS, as Integrity, PikeOS, QNX or VxWorks.^[4]
  • Embox^[5]
• Via binary translation of x86 or x86-64 ISA:
  • Linux
  • MS-DOS, Windows 95
  • Windows XP, Windows 2000, Windows 7
  • QNX

Note: in the "Year" column the date of completion of the development work on the creation of the "microcircuit" is indicated. The appearance on the market of ready-made computing modules and machines takes at least 1 year, and multiprocessor systems and complex computing systems – at least 2 years.

• Elbrus-2S+, produced 2011 by TSMC Taiwan^[6]
• Elbrus-2SM, pilot production 2014 by Mikron Russia^[7]
• Elbrus-4S, ready for serial production 2014^[8]
• Elbrus-8S, produced 2015 by TSMC Taiwan^[9]