I bought an automatic voltage regulator at OCTAGON for my CPU today, but when I got home I just found out that it is rated 230Vac, 60Hz. My CPU is rated 220Vac,60Hz, and my monitor cable is rated 225Vac,10A. Is it safe to use the AVR? Will it cause overheat to my CPU and monitor cable? Thanks for your help.

220VAC no longer exists in the US, it is 240 VAC. It should be fine.