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This is my first post and I'd appreciate any help you guys can offer. I've been using my AW M18x r1 since I bought it new. Basics: I7 2760qm sandybridge Bios A5 16 gb ram Radeon 6990m 2gb I used to run 2 6990m's, but the primary died 3 yrs ago and I replaced it with the secondary card. Been working great until this week. I'm using hwinfo64 for fan monitoring. I started having lock-ups to black screen, grey screen or black with white vertical lines. I noticed my shader temp on my GPU was running out of control whenever I start game or even run a video. The other temps seem to be in the normal range. The shader will jump from 39 C to 70 C almost immediately and then upwards from there. Over 100 C when I 1st caught it. I assume it's thermal shutdown. I'm using the legacy driver for my card 15.7.1. I'm willing to buy a new card, I'm looking at a 780m, but I want to figure out if it's just an issue with the card. Any suggestions on testing for other issues? Why would it be the shader only, or is that just an issue with Hwinfo64? Thanks in advance.

I have a dell 6990m bought it off ebay, part number RDRGR, was tested in an m18x r1. Anyways the card is fine I'm assuming but I have a black screen the moment I start up the computer but I can hear the sound of windows starting up and everything. Please someone help. What do I do? Also My specs are i7-740qm 500gb hdd seagate 6gb ram Original card was radeon hd 5730m HD+ 1600x900 screen

Oh i know the look on your face when you saw the title your thinking not another whos better! I was thinking about changing the question! Say its a perfect world and both of the video cards were free which would you choice and why? Me personally I would pick Nvidia because I have had very bad experiences with AMD/ATI what about you? Edit: I am referring to the 580m sorry for any confusion!