The QXGA or Quad eXtended Graphics Array, represents display standard which uses 2048×1536 pixel resolution. This was the highest resolution by the year 2007,

WQXGA or Wide Quad eXtended Graphics Array refers to a display resolution of 2560×1600 pixels with a 16:10 aspect ratio. This is often the maximum resolution of latest graphic cards produced in year 2008 (ATI series 48x0 and NVIDIA series 2x0).

Related display standards:
QSXGA or Quad Super Extended Graphics Array
Resolution: 2560×2048
Aspect ratio: 5:4

WQSXGA or Wide Quad Super Extended Graphics Array
Resolution: 3200×2048
Aspect ratio: 25:16 (1.56:1)

QUXGA or Quad Ultra Extended Graphics Array
Resolution: 3200×2400
Aspect ratio: 4:3

WQUXGA or Wide Quad Ultra Extended Graphics Array
Resolution: 3840×2400
Aspect ratio: 16:10

Some of this new display standards have special use. Number of monitors, that support this high resolution standards like WQUXGA are limited due to it high requirements. (Toshiba 22'' LCD monitor with 3840×2400 resolution will be in sale in second Q of 2008, for approximately $18,000)