The resolution supported by an XGA display is 1024x768. SXGA supports a higher resolution of upto 1280 x 1024 , or approximately 1.3 million pixels.
Here is some more:
XGA
Short for extended graphics array, a high-resolution graphics standard introduced by IBM in 1990. XGA was designed to replace the older 8514/A video standard. It provides the same resolutions (640 by 480 or 1024 by 768 pixels), but supports more simultaneous colors (65 thousand compared to 8514/A's 256 colors). In addition, XGA allows monitors to be non-interlaced.
UXGA
Short for Ultra Extended Graphics Array, a display specification that is capable of displaying 1600 x 1200 resolution, or approximately 1.9 million pixels.
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here if you want to know what non-interlaced is.