Upgrade Graphics card xps 8700

http://nvidia.custhelp.com/app/answers/detail/a_id/3156

Answer ID 3156
  |    Published 10/25/2012 03:12 PM
  |    Updated 10/26/2012 02:00 PM

When installing an after-market graphics card into a
certified Windows 8 PC with Secure Boot enabled, the system may not boot.

Secure boot is enabled by default on certified Win 8/10 PCs. When an after-market graphics card not containing UEFI-enabled firmware (VBIOS) is installed into a motherboard with secure boot enabled in the SBIOS,
the system may not boot. The majority of retail graphics cards manufactured in 2012 do not contain UEFI-enabled firmware.

In order to get the PC to boot with a graphics card that
does not contain a UEFI-enabled firmware the end-user must first disable the secure boot feature in the system's SBIOS before installing the graphics card.

Note: 
Some system SBIOS's incorporate a feature called compatibility boot. These systems will detect a non-UEFI-enabled firmware VBIOS and allow the user to
disable secure boot and then proceed with a compatibility boot. If the system contains a system SBIOS the supports compatibility boot, the user will need to disable secure boot when asked during boot process

Instructions for manually disabling secure boot:

1) Power down the system

2) Remove the NVIDIA  Add-in card

3) Boot the system using  integrated graphics

4) Enter  F2 CMOS settings.
CMOS settings can usually be accessed during boot, typically by pressing F2,

5) Set Secure Boot to  disabled

6) If there is an option, set CSM (or compatibility or legacy mode) to enabled.

7) Save the new settings

Power down the system

9) Install the NVIDIA  Add-in card

10) The system should now boot