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02.24.2007, 04:29 PM
The cost would be about $30 difference. The 8XL with the heatsink built in will not come apart because the endbells are screwed, not pressed on. The speed differences won't be major, but you can gear the 8XL up to almost match the speed of the 7XL. If you plan on running 4S and 4S only, and not going up to 5S, I would probably go with a 7XL.
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