x86 (Intel, AMD) — x86 or 80x86 is the generic name of a microprocessor architecture first developed and manufactured by Intel. The x86 architecture currently dominates the desktop computer, portable computer, and small server markets.
xDSL — Digital Subscriber Line, or DSL, is a family of technologies that provide digital data transmission over the wires used in the "last mile" of a local telephone network. Typically, the download speed of DSL ranges from 128 kilobits per second (kbit/s) to 24,000 kbit/s depending on DSL technology and service level implemented.
Xilinx Virtex 4 — Virtex-4 devices incorporate up to 200,000 logic cells, 500 MHz performance, and unrivaled system features to deliver twice the density, twice the performance, and half the power consumption of previous-generation FPGAs.
XScale — Intel XScale® Technology was designed to optimize low power consumption and high performance processing for a wide range of wireless and networking applications and rich services. The XScale, a microprocesser core, is Intel's implementation of the 25th generation of the ARM architecture. It is based on the v5TE ISA without the floating point instructions. XScale uses a 7 stage integer and an 8 stage memory Superpipelined RISC architecture. It is the successor to the Intel StrongARM line of microprocessors and microcontrollers, which Intel acquired from DEC's Digital Semiconductor division as the side-effect of a lawsuit between the two companies. Intel used the StrongARM to replace their ailing line of outdated RISC processors, the i860 and i960.