First things first, uninstall prime95 and forget you every heard of it. Prime95=ho to turn PC into space heater.
Download something like realbench and select the stress test. That more indiciative or real workloads or blender then get the classroom or Viranda render and run it in animation mode where it will render it over and over until you stop it.
Cant win them all, whats your heat doing? 87 is a bit on the high side, get that down to 80C or less on hottest core and bet you can squeeze 5Ghz out. Crap I can get 5.1 GHz out of a 9940 but thats on a custom loop, not an AIO. But If I were to choose and AIO the H115I is a good choice. Keep one around for testing new boards and CPU before I stick them in the case.
