XPS 15 (L502x) with i7-2860QM - 16GB RAM supported?

Nope.

The maximum amount of memory that system can use is 8GB (4GBx2).

Is that a hardware limitation or a BIOS limitation?

I remember when I bought my XPS M1530 it could only take 4GB, but after a year or so a new BIOS with support for 8GB arrived.

Chipset and CPU can def do 16gb - let's hope Dell address this

note.on Kingstons site they state 2x8GB will work for XPS 15....

Just as a note, on Crucials web site, it also says it can use is 8GB (4GBx2).

I imagine that it is a BIOS restriction but I do not know that for a fact.  

8GB is all that Dell says will be be supported on that system.

Hmm - to cancel or not to cancel - XPS 15 order - that is the question :-)

I pushed my order today of an maxxed out XPS 15 + 16gb RAM at the side.... let's see what happens :-)

hey..... that was odd I have a mail with a post update - where "jj826" posted here that he tried with 16GB and it worked... however the post has been removed?

I didn't remove that post but I do remember is.  It would not have been removed just because it confirmed that 16GB would work in that model.

I would say that the language that was used violated the TOS that was agreed to.

Rickard505,  any updates on it running with 16gb?

I can not tell you until 13th Jan :-) (still waiting for my machine)

Also confirming that my XPS 15 L502X is running now with Komputerbay 16GB (2x 8GB) PC3-10600 10666 1333MHz SODIMM 204-Pin that I ordered from Amazon. Windows 7 reports 15.9GB usable.

Processor, I7-2720QM, 2.2, 4C, SNB, D2, P

*miss out .....