I have a 7260 installed in my XPS 8700 and it works fine.  You must upgrade to the Intel drivers in order for it to function.  Intel does have a newer card - 7265, but I don't believe it will fit in the 8700 slot. [URL] 
Hi I have a Xps 8700 mid 2013 32 GB ram 240 Crcial SSD and factory 1Tb HD At present I have the 1703 card I have a AC 7260. Is Intel or anyone else putting out a better card then the 7260 . Just want to know so im not throwing money out the window
1703 7260 upgrade