new cpu alienware x51 r2

I bought my alienware x51 r2 almost a year ago.

I bought the version with a i5 4430 and gtx 645 oem and 8gb ram. 

around new year I bought a new graphics card the gtx 760 and a new power supply to handle it.

now I want to upgrade my cpu to the i7 4790 or the i7 4790K edition. the difference is 400 mhz. 

but the motherboard from the x51 r2 doesn´t support overclocking so will I be able to use the i7 4790 in mine alienware x51 r2? I updated my bios to the a06 and they say that it now supports i7 4790 but not the i7 4790k. will it also works? 

thanks

http://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=31R9N&fileId=3366934260&osCode=W764&productCode=alienware-x51-r2&languageCode=EN&categoryId=BI