Alienware x51 r2 graphic card upgrade : which card should I buy?

#1
I want to upgrade the graphics card in my alienware x51 r2 to a GeForce GTX 1060 SC.

Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
16GB RAM
GTX 750i
256SSD + 1TB Storage
330W supply

I know GTX 1060 FE is a best fit for my system. however, it is out of stock even on Nvidia's homepage.

I am not sure which to buy. I tried Zotac 1060 mini 6GB but It did not work well. it might be caused by lack of power, I think. so I returned it.

Can you recommend which product I should buy for this purpose?

this is a picture of the problem I had with zotac 1060 mini 6GB. in 5~6 min after bootup, GPU stopped working.

alienware x51 r2.jpg
 
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