I plan to underclock and undervolt not too much but just enough so that my 160w picopsu can handle the stuff at 90% of its capacity and while maintaining the stability of the system . What i plan to do is to buy the parts besides the graphics card and then as you suggested i will try out the integrated graphics and see if it can handle my software and then take a decision on buying an additional discrete card .
With modern hardware most of the underclocking and undervolting is automatically done for you. A Haswell CPU can lower the clock speed to 800MHz in idle down from 3.4GHz and reduce the voltage which reduces power consumption. Part of the power delivery system has moved from the board onto the Haswell CPU so adjusting the voltage works faster and more efficient. You can undervolt the CPU around 10% or so, but the difference in idle will be close tho what you can measure at home, under load 3W-4W maybe.
Graphic cards clock down from 800Mhz or more to 300MHz and also downclock their RAM in idle. In normal use your system should use ~60W if not less, idle maybe 30W-40W.With the right setup ATI cards can go into long idle mode and use next to no power.
Ok got your point pappnaas , anyways can u tell me the difference between underclocking and undervolting a locked cpu vs an unlocked cpu ?
Sry, i can't. Please someone from here might help us out.
Unlocked CPUs allow for raising the clock speed beyond the factory spec, nothing more.
Undervolting was a thing before CPUs could adjust their clockspeed based on load.
1) my build total wattage comes to 152w after i add the cpu 45w tdp to the pcpartpicker list:http://pcpartpicker.com/p/1oEmp
i was wondering how did you get 120w?
I read reviews that measure power consumption.
The CPU calculator can never be 100% accurate because they could never keep up a database of all the parts accurately. It also overspecs because most calculators are run by PSU sellers. A bigger PSU costs more. Another problem is people cheaping out on PSUs. Cheap PSU often cannot deliver the power they promise. On this forum you will get recommendations for quality PSUs such as Seasonic, their PSUs can deliver more than indicated and have a fail safe so they shut down if the load is too high.
The Nofan CR95 works totally fanless and the graphic card works fanless, too.
Using the CR95 requres so much space that you need an mATX mainboard, though. and not just anyone, the cooelr is so big it blocks the slot closest to the CPU. The Intel DH87RL
is the only mATX board with the graphic card slot one over from the first. Intel boards are very frugal with power.
A fanless system with these components would work well inthe SilverStone Fortress FT03