Update the video driver package for both Intel/NVIDIA from Dell if not already latest. (The crash involved dxgkrnl but that doesn't necessarily mean a video driver was at fault.)
You should attach a screenshot of CPU-Z Memory tab and one each for each stick of RAM of SPD tab.
ASUS DirectCU II HD7790-DC2OC-2GD5 Radeon HD 7790 2GB 128-Bit GDDR5
Sound Card
MOTU Traveler firewire interface
Hard Drives
1 Seagate Barracuda SATA II system/boot drive 80 GB, 2 Western Digital hdds - 1 is SATA II Caviar Black 1 TB attached to card (assorted media, page, temp), other is SATA I 420 GB (games, media, downloads)
PSU
Thermaltake 450W
Cooling
stock Gateway cooling, extra large fan in rear of case