3 ms·

I don't know how well I trust your sources. Tom's Hardware shows typical 1-7% idle load for a Windows machine using Ryzen 1800x is about 14 watts. And your link

• paulmd 10y ago
  The problem is that most PSUs have really terrible low-end efficiency. 80-Percent Plus's efficiency standards only kick in at 20% load, so the 1500W PSUs in the test systems sites use (eg your link - Silverstone ST1500) are massive overkill and you're running them at like 1% load. At those levels efficiency trails off to pretty much nothing - there is more or less a constant load at very low levels (i.e. efficiency approaches 0% near 0W load) Looking at package-TDP only gives you a totally different picture. Not invalid necessarily - but different. It's easier to tease out the system under test but it's more difficult to get a holistic picture. (As such, it is much much easier to cook the books when all you have to do is lie through a sensor readout than when you have to lie to a meter at the power plug. This is usually a game that gets played with GPUs, i.e. how the RX 480's "GPU-only" TDP excludes power consumption from memory, losses to VRMs, etc) Also - servers are pretty much never at 0% load. Any system that has CPUs at 0% load consistently was over-allocated in the first place. Ryzen does idle a little bit better than Broadwell-E - although factoring out the PSU inefficiencies near the zero bound it's probably more like 25W for Broadwell vs 15W for Ryzen. Right now HwMonitor64 says my 5820K is idling at the desktop at 25W FYI - "as reported by the CPU".
  • Laforet 10y ago
    Yeah, most low load power consumption measured from the mains socket is hogwash - my current PSU regularly pull 50W or more during standby. The alternative measure is to put a clamp meter on the EPS12V line, but this is unlikely to be accurate either.