On 01.05.2016 15:30, Daniel Kulesz wrote:
Hi Nico,
On 01.05.2016 12:26, Daniel Kulesz via coreboot wrote:
Coreboot with idle=poll: 15,8W Coreboot running "stress": 37,2W
well, this is what I would expect from the specs.
Vendor BIOS with idle=poll: 15W Vendor BIOS with intel_pstate=disabled: 10W Vendor BIOS running "stress": 24,3W (!!)
This looks suspicious. Doing some calculation: You are measuring at the wall plug, efficiency could be around 83%, which would leave 20W. Chipset, backlight and other stuff needs power as well, say around 8W, leaving 12W for your 25W TDP CPU???
Well, I could imagine that the PSU's efficiency is better than 83%, and maybe the CPU is just rated at 25W TDP while in fact it consumes less. Please note that the whole family of CPUs is rated at this wattage and so is the P9600 which runs at 2,66GHz and not just 2,53GHz and at a slightly higher min. voltage (but slightly lower max. voltage).
It's the other way around. If a sample is stable at 2.66GHz without drawing more than 25W it's a P8800, if only 2.53GHz it's a P8700 etc.
Nico