That Rosewill PSU is plenty powerful for those upgrades.
It appears that your motherboard will support the E8400. Just make sure that it has the latest BIOS version. If you got it from Dell, then check their site for any BIOS updates and be sure to use theirs and not anyone else's.
"They should rename the team to the Washington Government Sucks. Put Obama on the helmet. Line the entire walls of the stadium with the actual text of the ACA.
Fix their home team score on the board to the debt clock, they can win every game 17,000,000,000,000 to 24. Losing team gets taxed by the IRS 100%, then droned."