A bit over a year ago my then 7 yo desktop PC was showing its age, so I replaced the motherboard, CPU, and RAM. I kept my old case and video card for cost reasons.
Recently I decided to replace the video card, as costs had stabilized. However, the one I purchased needs more power than than is supplied through the motherboard, and I discovered my existing power supply wasn't powerful enough to do the job. The PC arena changes quickly, and if you're not building them frequently, assume EVERYTHING has changed since the last time, and you won't be wrong.
I ended up buying a new case (I'll not go into the technical details unless someone needs a cure for insomnia) and power supply.
Even with a tower case, the insides can be cramped, although in comparison laptops are the equivalent of a 1 room apartment with 10 people living there.
The new case is larger with a LOT of interior space, and the power supply is modular, e.g., meaning that I don't have to make room for a half dozen unnecessary cables. I plug in only the cables I need.
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This one has a LOT more space, so airflow is better. I'm going to add more fans pointing up, to help with cooling.
The many cables are on the other side of the what is the "back" in the above photo.
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It's still a snake nest of cables, but none of them is bouncing into a spinning fan, so I call it a win.
This case has built-in support for LED fans, e.g., the fans change color and are programmable. One reviewer got really excited over this, although he was also raving about the colors on the outside of the box the power supply came in, so his review wasn't exactly useful to me.
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Me? I don't care about the colors of the fans, as I'm paying attention to what's on screen, not watching a colored fan spin ...
As I got into this, I recalled vividly why I don't build PCs all that often .......