i7-4790 is a 1% better than 4770. i7-4790k is 15% better than 4770. both 4790 and 4790k are validated in 8700. otoh 5775C has not been validated in 8700. i7-5775C has been validated on Z97 chipset motherboard which supports Intel 5th gen cpu.  XPS8700 has Z87 chipset.  Despite the latest Dell bios update, the chipset may be not compatible with 5775C. the Z97 Express chipset officially supports the fifth generation Intel Core processors. Whereas Z87 Express offers support only up to the fourth generation chips. This means if you plan to upgrade to a ‘Broadwell’ chip such as 5775C, you’ll need Z97  
My desktop is an XPS 8700, yes it does have the latest dell released BIOS available on it, yes it's out of warranty, yes i replaced the graphics card with an RX 570 from ebay, and yes i put the maximum amount of RAM it can handle with the current CPU it has My current CPU is an i7-4770, and the motherboard is a Dell Inc. 0KWVT8 motherboard (LGA 1150 CPU socket), but the question fluttering in my mind is: can i switch it out with a different one? so i researched online, found the pc-specs website, looked for the biggest choice i got for a higher tier CPU it shows, and it says an i7-5775C cpu is as big as i can go, here's a screenshot (I had to use the firefox inspect function to delete certain portions of the website so i could get this all in one with firefox screenshot, kept scrolling for some reason) [IMAGE] i had to use the archive.org/web website to actually access this because using the url regularly shows an error. i get my desktop is old, VERY much out of warranty, and in overdue need of replacing, and at some point i WILL be getting a new one, maybe from dell, maybe somewhere else, maybe building my own, but in the mean time im going to squeeze every bit of functionality out of it before i have no real choice BUT to upgrade Dell support & community members, with the CPU socket on it, and with all the defaults still in it, what CPU can i replace my i7-4770 with if I wanted to upgrade to something even a little bit better than it is now (or if my current one ends up fried because of [insert reason here])
XPS 8700, upgrade from i7-4770?