Besides the size, whats the kind of load is the 100%?
On Prime95 AVX and OCCT I think is impossible, even with a bigger rad, it's too much heat to get rid off in so short time and little area avaliable.
Another benchs, like AIDA, CB R15/R20, CPU-Z, etc is not that hard. Games like Apex, MK11, SOTB, Division 2, PUBG are easy.
By the way, RPCS 3 (PS3 emulator running Demon Souls) and Cemu (Wiiu emulator running Zelda BOW) are heavier than most triple AAA games.
I'm using a 280mm rad with Vardar fans on a moded A60, at 5ghz, the only tests that exceed 70° C (easily) are Prime95 and OCCT.