What do you think is more likely, that this guy would stage his video card exploding, or that the video card, having a known issue, would actually go up? There's other videos online showing the same thing. The simpler explanation is usually the correct one.
For example, how difficult would it be to set this up in the first place? Blowing up another card, or editing the video?
What does this person have to gain by lying?
If this was staged, how come there's evidence of this happening in other videos, photos and personal accounts by people?