This refers to the SVGA resolution. The firmware in the .rar file is specifically tuned to the timing and voltage requirements of panels with this pixel count.
Many sites claiming to host rare drivers or firmware archives are actually "SEO traps" designed to deliver adware or trojans. Download TOP TECH TSUX9V5 800x600 rar
It is always safer to contact the manufacturer of the driver board or check community forums like BadCaps or specialized display forums for verified files. This refers to the SVGA resolution