Using i5-3470, basic online psu calculator gives same result.  To use the 240w psu, better disconnect optical drive power and replace mechanical hdd with sata ssd. Every mechanical spinning drive consumes more power than solid state. Re: I don't want anything to 'blow up'. psu would not output more power than its rating. Worst case is under-power of components but not electrical over draft hazard.
Hi I have an Optiplex sff 7010 with an i3 3225 CPU and I'd like to use an i5 3470 along with a low profile HD 7570 GPU. The i3 uses 55W however the i5 uses 77W and the GPU uses 50W. Given that the hard drive and other components will use some, albeit little, power does anyone think the 240W power supply in the sff Optiplex could cope or not? Also would the 77W vs 55W be too much for the CPU socket? I don't want anything to 'blow up'. Having said all that the i5 3470 is listed as usable in the sff Optiplex 7010 Technical Guidance booklet but with the GPU I'm wondering if the two are too much when put together and if the CPU socket can cope. Regards Steve    
Upgrade an old sff Optiplex 7010 with an i3 3225 cpu to an i5 3470 while using 
a GPU too?