I've been benchmarking my PE T410 with 2x x5670 Xeons and cannot get them to run at full speed. I've tried disabling C-states, C1E, even turbo mode in BIOS, along with all variations of Max performance, OS DPM (also in BIOS). OS settings for max power, no core parking, no throttling, etc... but cannot get the processor to run at max speed. No matter what settings I use Intel Speed Step seems to stay enabled and the processor speed bounces around from 1500 and up (benchmark speed reports as only 1600 - 2100), when it is supposed to be under load. Core Temps are in the low 50*s so there should be no thermal throttling happening.
Does anyone know of a way to shut of Intel speed step? Or it this behavior SOP for Server type hardware? I know the motherboard has some issues (s100 controller is malfunctioning and the system halts if a shutdown command is given). The latest BIOS is installed. Could the motherboard be causing the issue?
TIA