I have an Optiplex360 in Mini Tower case with a 255W PSU and the question is can this Dell work fine with a GT240 card like "ASUS ENGT240" ? is the 255W PSU capable to handle any card with the GT240 GPU ? or do I have to stick to the much lower 210 ??? from 210 to 240 as I know there is no need for extra Power connection , at the sticker in the PSU is written : "MAX combined consumption should NOT exceed 121W"