Well the markings on the plug say it's rated for 10Amps at 250V, so the cable should be safe to use on equipment up to 250 x 10 (2,500) Watts .. though to allow a bit of safety margin lets say it safe to use on any equipment up to 2,000 watts.
Your PSU is only 850 Watts, so yes that cable should be ok.
{GoofyOne's 2c worth}