ultra efficient light gaming pc needed

hi all,

currently i have an overclocked phenom x4 955 system, which runs at a constant 4ghz overclock for approx 6hours per day

i am seriously considering an ultra efficient light gaming pc, as i only really need the top gaming performance (bf3) for about an hour at a time (or sometimes not even playing that day)

the other game i play is counter strike 1.6, which of course is not demanding in the slightest, and a little counter strike global offensive

i mainly browse the web and watch a lot of youtube (1080p etc)

im looking for a very efficient pc which will allow me to do some light gaming

http://www.scan.co.uk/products/intel...odimm-5xusb-20


this is one i have been considering, however, i doubt i will be able to play any games on it other than original counter strike!


another option is a build around the Haswell Pentium

another is the AMD A4-4000


i was wondering what you guys would recommend

i dont really want to cross the line where i compromise on gaming performance (cs:go for example), where either the Haswell P or A4 wouldnt run it to my satisfaction (over 60fps), and simply use the Phenom system when i want to play these games

all-in-all, the complete systems would all likely cost a similar amount (~?280 with memory and ssd etc)