Hannes The Hun Wrote:yes, and most definitely no
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If I'm reading what you write right, you're suggesting that a SSD vs a normal HDD won't alter the fan spinning. While it might be the case, it's not really giving the full picture.
To be clear, if the fan is going to ever shut off or go to the lower speed setting, it's much more likely to do it with a SSD than a regular drive. The SSD does not generate any heat, whereas the normal drive (even a 5400) will be generating heat. So, you're going to overcome that 'fan activating' threshold much easier with a standard drive vs. a SSD.
Having no drive whatsoever in the case improves the airflow through the case dramatically, based on user reports, which helps with the cases heat issues.
My gut reaction based off the fact that it's fine with the lid off is to massively mod the cover - cut a fan sized hole (90 or 120mm if it's even that big) then put a fan grate over the hole for aesthetics. It will look decent, will have much more air movement, and could stop the fan from activating.