Is my CPU faulty?
I got Xeon E5-2687W for cheap on eBay a while ago. I also got an Intel X79 motherboard. When I assembled the PC and stress-tested, I noticed that Turbo Boost was not working and even the CPU was downclocking to 3.0 GHz after exceeding 63°C on 100% load. Max temps under 100% load were around 78°C. I tried resetting BIOS several times, swapped the PSU and finally I assumed that the mobo was not compatible.
Today I got ASUS P9X79 motherboard with i7 3930K, which did not show any kind of problem. I reset the BIOS and as soon as I inserted my Xeon, it again downclocked to 3.0 GHz after exceeding 63°C. So that rules out the faulty mobo. Thermal throttling on Intel CPUs generally occurs after about 90°C. Intel Extreme Tuning Utility does not report any thermal throttling. Is such behavior normal for this Xeon model or is there any other explanation?
UPDATE: Read post #8 for today's findings.
Last edited by wanna_buy; 08-22-2019 at 07:17 AM.