The fact that it's a 700W (not the more modern 650W/750W) and only 80+ (not even bronze) tells me this is either an old or lower quality Antec unit. Most likely the OP can buy a better quality PSU for the same price.
650W would be plenty for that rig.
I have an i5-3570K OC'd to 4.2GHz, RX480 @ 1305MHz, 1 SSD, 1HDD, 4 fans.
Power draw from the wall measured with Kill-a-Watt = 270W while running both Prime95 and FurMark concurrently. Accounting for my PSUs 90% efficiency, that's 250W on the PSU.