XPS 15 9530 Graphics Problem

Call Dell, get them to replace the fans/motherboard that's what fixed it for me. Doesn't overheat at all now.

I had to tell them its overheating and shutting down the GPU.

(btw running in power saver will extend the time until it overheats as a temp fix)

I am/was having the exact issue as you, didn't matter what game or 3d application I was running. I used GPU-Z to track the speeds and temp. When having the issue, I noticed that my gpu core on the 750m was sitting at ~1050mhz and voltage at 1.112v. Once I hit temps of 82c+, it was like the bottom fell out and my gpu core fell to ~150mhz (along with memory speed drop and voltage drop). I noticed this happening across 3 different NVidia driver versions. That being said, after doing a system reboot I noticed the issue went away. I'm wondering if resuming from sleep can muck up the gpu's ability to throttle itself properly. Not every time, but only sometimes. I would attribute this to a bios/firmware issue on the gpu and not the driver, since I tried a few driver versions. Who knows, maybe it's even something with Win 8.1 and how it interacts with the driver? Point is, it doesn't appear to be a hardware defect. A simple shut down / restart or reboot of the computer seems to clear things up. Quite an annoying issue for a laptop at this price point. Wish Dell or NVidia could provide some sort of assistance. Hope this helps!

yes this is xps , xtreme performance system not xtreme performance trouble,

is word "trouble" violates dell Terms of Service  ?

skyrim is demanding game , please find game not so much demanding your xtreme performance system laptopt

maybe tetris ? or pinball ?

you need to monitor your cpu temps.. what are those? skyrim is a demanding game.. and  it sounds like your cpu maybe over heating and or skyrim had an update and you need to update your gpu drivers..

this is recomended requirment for playing skyrim

Recommended

• Windows 7/Vista/XP PC (32 or 64 bit)
• Quad-core Intel or AMD CPU processor
• 4GB System RAM
• 6GB free HDD (Hard disk drive) space
• DirectX 9.0c compatible NVIDIA or AMD ATI video card with 1GB of RAM: Nvidia GeForce GTX 260 or higher; ATI Radeon HD 4890 or higher
• DirectX compatible sound card
• Internet access for Steam activation

your almost 2000 usd notebook is meet this recomended requirment ?

In this case, it is a GPU issue, not a CPU issue. The cause of the issue is definitely that the GPU was not throttling itself properly. A fresh reboot would fix this. I'm not sure what was triggering the GPU to forget how to properly throttle itself. However, the OP says that the latest BIOS update fixes this issue. I installed A04 last night but have not yet had enough time to properly evaluate whether or not the issue will return. This laptop can definitely handle Skyrim, just maybe not at max settings. I'm sure this laptop can crank it out at 1920x1080 at least at medium settings. The GT 750m is a decent dedicated laptop GPU.