M15x GTX 260m Graphics Card crashing

I'm afraid the only way to diagnose that the card is 100% at fault is to try another card. Before buying another card, try a couple of things first.

1- Try changing drivers, and not necessarily the latest drivers. Try the drivers from Dell's site. They are old and outdated but probably the most stable for testing.

2- Monitor your temps. Your card may be overheating, causing the system to shutdown. Use an app like Open Hardware Monitor or HWinfo. Try running a 3D benchmark like 3DMark, and check how hot your card is getting. Report back with your results.

3 - There may also be a problem with your power supply. What CPU do you currently have installed?

If you want to replace the video card, you have tons of options. Dell officially supported up to the 460M GTX on the M15X model, but you are not limited to that. Lots of people here have had success with high end cards like the Nvidia 970 or 980m, and the AMD 7970, but you will need to do some tweaks and upgrade your power supply to get those to work. If you want a good card with excellent mid-range performance for a cheap price, you can look at the AMD Firepro m6000. I am waiting for one to replace my 460m GTX. It can be purchased for as little as 70 USD on e-bay and requires no mods to get it working on the M15X. The m6000 will be a huge improvement over the 260m GTX.

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M15x GTX 260m Graphics Card crashing