No it won't void your warranty. The fan plug is directly beside the videocard. Follow the wire from the heatsink and make sure it's not loose or anything. If you push on it and it snaps in, then it was loose.
Having two optical drives isn't necessary, but it is damned convenient if you have the extra cash to blow. You can always make .iso files or similar for DVDs and CDs and then just burn the image onto another disk using the same drive....
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Originally Posted by Twilight
It is awesome, but it did not fix the stuttering in Half Life 2, it turns out that its a video card issue. There is actually a whole webpage devoted to the issue that Valve is...