coastie65 :
Ok. The motherboard in that thing is a Micro ATX. it is about 9" x 9" in size. They Titan is 10.5 " This a pic of the XPS 8500 opend up. It will not fit.
This is simply an incorrect assumption, but the picture is correct. The TITAN will fit in this system. I don't know why you would say otherwise. You must not own one of these systems.
As I stated earlier in this thread, I currently have an XPS 8500 with a 10.6" card in it, and previous to that, I had a card that was over 11.2" long in it (HD 5870 reference design). You can't tell from the picture, but the card can extend substantially inside and below the lower metal and the black plastic video card retainer at the lower center/right of the picture.
The size of the motherboard really has nothing to do with the max size of the video card that this case can hold.
The card that I currently have in my XPS 8500 system is this one:
http://us.msi.com/product/vga/N680GTX-Twin-Frozr-4GD5-OC.html
It is 270 mm (10.6") long.
FWIW, Dell has been using this same basic case design for quite a while, as I currently own three different Dell models that share the same basic case layout, dimensions and the ability to mount large video cards. The Studio XPS 7100, XPS 8500, and XPS 8700 all can handle video cards of at least 11.5" in length.
I just pulled the cover off of my XPS 8700 and stuck a tape measure in the video card space, and it's at least 14.5" from the vertical back of the card where the DVI connectors are to the forward bulkhead of the case. It's a huge open area that nothing occupies other than the video card. The lower perforated metal area in the picture does not contain drive cages or other equipment, it is a large open area where the video card lives.
Look on page 39 of this document:
ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_xps_desktop/xps-8500_Owner%27s%20Manual_en-us.pdf
for a much better picture of how the video card fits into the system