They sent me i7 4790s and over phone walked me thru downloading to both units latest Dell bios and Management Engine components Installer as well... 4790 came up with 4Ghz speed from 3.6G... and temp is stable at average 40Call seems good so ordered a 3rd Dell Optiplex 9020 from them, should be here next week per their tech support...Note: need to go into Bios with F2 and set enable performance to Boost on and multi speed on... and in Windows Power Options set to High Performance, at hi and low to100%... hope that may help someone else using i7 to get processors running at multiplier of 40.. Note the i7 4770 will boost to multiplier of 39, so is about 3.9G but temp is good 20C higher average, ie about 50-60c and hi temp limits speed down under loads... so using the 4790 I think is better choice.. runs and is stable under heavy loads highest temps I observed were in low 50C, I do heavy work with videos and need lowest cost per computer with at least 4G speeds, all 4 cores running, with 2 hyper threads each core... Will give update later if can do so, am 80 years old and still going strong, thankfully, and it is because of God's help I am sure..11/3/2020 updatehave ordered and received a 3rd unit... all are working well at 4Ghz in my applications... need to be aware of settup noted above to see and set up correctly to work well at 4Ghz, and redu the silicon to keep heat down if that is an issue... Very satisfied customer!!