Powering Ebay fans

Is there a chance that these fans could be powered by 7.4 V? Maybe using the yellow wire since yellow usually means 7.4v in computers if i'm not mistaken?
 
The images of the sticker on the fan themselves say 5v. You can probably run it at 7.4v but you might burn it out after a while (or right away, depending on how picky the motor is). It'd also be louder than normal.
 
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