Don't mean to bump this thread but I can answer your questions.
You can replace the rear 140mm fan as well as the top fan. All you have to do is pop the top part of the chassis and you'll see that all the fans have a 3-pin lead connected to the fan controller.
Just disconnect the particular fan you want to remove and then gently pop the plastic top back onto the case.
Also the case can easily fit a 5970 if you remove the 3.5" HDD bay.
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