BlackArchon Posted March 29, 2017 Share Posted March 29, 2017 Here I have a Xeon E5-1680 v2 (which is an Ivy Bridge-EP processor). Since it has an open multiplier, I'm overclocking it. Currently I'm using it on an Asrock Rack EPC602D8A mainboard - yes, there are Xeon mainboards with overclocking capabilities. As a start, I set the all-core turbo multiplier to 40 so that it should run with 4 GHz on all of its eight cores. In heavy tests like Prime95, it will however clock down to 3700-3800 MHz. The reason is that the CPU won't go over its rated TDP of 130 W. Hwinfo64 and HWMonitor confirm that. I've changed quite some BIOS settings, including the short and long duration power limits, but these values got ignored by the CPU. Also the high performance power plan in Windows 7 doesn't change the problem besides running the CPU at 4 GHz in idle while still downclocking it on high load. The temperature isn't a problem because the internal temperature sensors report about 65 Â°C maximum for the hottest core: it is really the power limit which is holding back the CPU. My question is: do I really have to get a used X79 mainboard to ignore the CPU's TDP? Or is this a restriction of the Xeons which even X79 mainboards cannot ignore? Quote Link to comment Share on other sites More sharing options...
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