What is in there now?  CPU appears to be in a socket.

That does not mean you can swap from 6th/7th gen to 8th Gen however. The chipset is not the same.

Desktop 8th Generation Intel® Core™ Processors use the LGA1151 socket, but they need new Intel® 300 Series Chipset motherboards.

@DELL-Chris M   might have more information about the validated Processors for this board.

there also appears to be more than one board type.

https://www.userbenchmark.com/System/Dell-XPS-7760-AIO/44902

https://ark.intel.com/content/www/us/en/ark/products/97128/intel-core-i7-7700-processor-8m-cache-up-to-4-20-ghz.html

motherboard does have a socket LGA 1151

XPS 27 7760 AIO IPPSL-DC AMETHYST

Intel Motherboard D4VY1 Y5J85 0Y5J85

Dell XPS 27 7760 IPPSL-DC-BAFFIN

Motherboard  0K63G3 K63G3

The i7-8700/8700K CPU were never validated by Dell on this model.

XPS 27 7760 motherboards =
P3KGF Pegatron Intel UMA Intel HD Graphics 530
0P8G1 Pegatron Intel UMA Intel HD Graphics 530 (mod number K63G3)
Y5J85 Pegatron Intel UMA Intel HD Graphics 530
D4VY1 Pegatron AMD Ellesmere R9 M470X
PR1NK Pegatron AMD Amethyst R9 M485X

XPS 27 7760 CPUs =
FG2MR i7-7700 Kabylake-S, 3.60GHz, 8MB, FSB 4000MHz, 65w
JF87D i7-7700 Kabylake-S, 3.60GHz, 8MB, FSB 4000MHz, 65w
J4CPH i7-6700 Skylake-S, 3.40GHz, 8MB, FSB 1600MHz, 65w
NWHFK i5-7400 Kabylake-S, 3.00GHz, 6MB, FSB 3300MHz, 65w
69J7M i5-6400 Skylake-S, 2.70GHz, 6MB, FSB 1600MHz, 65w

Thanks for the info!  Very helpful!!

Did you ever manage to upgrade the processor? 

I have the same machine with the 7700  and 32gb of ram  and really like it, but win 11 says it does not meet specs to install!

I've been running Windows 11 on an unmodified 7760 AIO (i7-7700) for about 3 months now and it works perfectly.

The trick is to do a clean install from a Win10 (or in my case, Win11 beta) installation ISO with replaced payload and disable secure boot.

Just create a bootable thumb drive using win10 media creation tool, then mount the win11 ISO and find a file called install.wim inside the Sources folder. Copy and paste it into the same location on the flash drive (replacing the existing one) and Win11 will install just fine.

some notes though:

• you'll need to disable secure boot in BIOS Setup
• if you get a message about missing drivers in the very beginning of the setup, just move the USB stick to another port without rebooting, just continue the setup
• if you get a message saying "cannot create partition", turn the system off and physically disconnect all HDDs/SSDs except for the designated system drive.

hope this helps

has anyone else been able to ugprade?  This my wife's machine and she loves it but i'd like to get her up to Windows 11.   Is it worth trying to upgrade the CPU or should i just run the Windows 11 workaround to turn off the CPU check?   Has anyone done this successfully?   How do they recommend it?  Anything to look out for.  I'd rather not do a full clean install if i don't have to.  I just did a win10 clean install and already upgraded to tps 1.2 so it's ready for that. so the only thing it fails is the CPU test.    Anybody have suggestions???

Thanks very much! 

It is impossible to upgrade from intel 7th gen to 8th gen cpu if you do not change motherboard.  The 8th gen cpu uses same socket as 7/6th but requires 300 series chipset, which is backward incompatible w 7/6th.  The 7th gen cpu is incompatible w 300 series chipset either.  It only works with 200/100 series chipset.