I am not new to using PCs, but I am fairly new at building them. I have only recently noticed a fluctuating processor core voltage on one of my systems, which tends to stay at the low side, around 0.88-0.89, but every few seconds jumps to 0.90, 0.92, 1.00, and sometimes even 1.2x for a second or two. Memory voltage is on the high side, 1.58, but it is stable. +3.3v is also mostly stable but on the high side, 3.44-3.45. All voltages are read with Intel's Desktop Utilities. This system is very lightly loaded and does not even have a graphics card. None of the components are very old: Corsair Pro Series 650W, Intel DZ68DB, and Intel i5-2405S. The motherboard is brand new and the other two are only a few months old.
Any of the three components could be causing the processor core voltage ripple, but I think the PSU is the most likely suspect. But it could be the CPU. Unfortunately I never noticed if the ripple was occurring when the PSU and CPU were on the previous Intel motherboard (I am not thrilled about ripping it all apart and switching motherboards for a test).
Do we have any electrical engineers here who could share a few thoughts on PSU fluctuations and what they mean? How bad does ripple need to be to be serious? And how out-of-spec do voltages need to be to be serious?
Any of the three components could be causing the processor core voltage ripple, but I think the PSU is the most likely suspect. But it could be the CPU. Unfortunately I never noticed if the ripple was occurring when the PSU and CPU were on the previous Intel motherboard (I am not thrilled about ripping it all apart and switching motherboards for a test).
Do we have any electrical engineers here who could share a few thoughts on PSU fluctuations and what they mean? How bad does ripple need to be to be serious? And how out-of-spec do voltages need to be to be serious?