I'm trying to build a system with 250W psu. The system will only do CPU load and some occasional heavy hard drive work (no need for fancy GPU, DVD drive). While trying to figure out whether an i7 920 (I can use hyper-threading) or i5 750 system can fit, I've realized that the total system power consumption under CPU load is different in various tests.
For instance, AnandTech shows203W for the i7:
http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=3634&p=17
Tom's hardware shows 318W:
http://www.tomshardware.com/reviews/core-i7-sff,2312-16.html
Tom's hardware measurement is taken at the AC input, so given an estimation of 85% PSU efficiency their 318W becomes 270W. This is still 35% more then AnandTech measurement/ Note that GPU was idle in bothe tests.
Can anyone guess what could be the reasons for such a difference ? Do you think I can build an i7 920 system that consumes less then 250W at full CPU load ? What about i5 750 ?
For instance, AnandTech shows203W for the i7:
http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=3634&p=17
Tom's hardware shows 318W:
http://www.tomshardware.com/reviews/core-i7-sff,2312-16.html
Tom's hardware measurement is taken at the AC input, so given an estimation of 85% PSU efficiency their 318W becomes 270W. This is still 35% more then AnandTech measurement/ Note that GPU was idle in bothe tests.
Can anyone guess what could be the reasons for such a difference ? Do you think I can build an i7 920 system that consumes less then 250W at full CPU load ? What about i5 750 ?