DPC Latency is induced by broken hardware or shoddy coded drivers/energy saving nonsense which cause audio/video drop-outs of real-time data like video streaming or FPS gaming. The MSI Z77A-GD65 performed well here.
CPU Load Line Calibration
Loadline calibration is the mitigation of voltage drops, which affects full load stability during overclocking. Most older VRM implementations struggle in this test, but the MSI Z77A-GD65 survived. In this case we used the +87.5% setting in the BIOS, which doesn't cause voltage to overshoot the desired value (1.25v) and kept the overclock stable. We hooked up a multimeter when the stress test was running and hardly noticed any drop in the voltage reading.