I'm not so sure. I ran ibt on the stock cooler and stopped when it neared 70 (a few minutes in) because I was unwilling to put the processor through high temperatures to sate my curiousy about how crap the stock fan is. 64 load is within reason based on this experience.
apache pushing through heatsink, fans intaking at the front? Best guess on stated information is that the big fan at the top is robbing the apache of airflow, and temperatures will improve if you turn said fan off. Other option is, if there's two fans on the front, that you can defintiely improve matters by putting a piece of non-flammable material between graphics card and cpu, so that the card is fed by a 120mm intake fan and the cpu heatsink gets the other one (or two). The 4870x2 will run hot so suck in a lot of air, which again is air which never reaches your cpu heatsink.