SIS released new Xabre performance drivers 3.06.55. They should work on SIS 315 based cards and the integrated SIS740/650/651 too. (SIS 740/650/651 integrated are based on SIS315 GPU kernel). Read more...

http://www.xabre.com/download/drivers.html

http://driver.sis.com/graphic/gpu/xabre/xabre30655.exe

http://driver2.sis.com/graphic/gpu/xabre/xabre30655.exe

http://driver3.sis.com/graphic/gpu/xabre/xabre30655.exe

Thanks goes out to Deniss for this information.