Diablotek Da Series 400-watt Atx Power Supply Is A Dell Optiplex 740 Compatible With A Diablotek DA Series 500w ATX Power Supply?

To contact us Click HERE

Is a dell optiplex 740 compatible with a Diablotek DA Series 500w ATX Power Supply? - diablotek da series 400-watt atx power supply

So in trying to set my PC and I have a Dell OptiPlex 740 http://support.dell.com/support/edocs/systems/op740/en/UG/sff_index.htm
and to buy IB Excalibur DA Series 500W ATX Power Supply http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4365851&CatId=1079

If I with my PC that I do not really fit into the housing, while its plugged in to buy, operate it? Need help