An interesting fact for me is that I
always build my computers in "Desktop" cases...!
This means that the motherboard and processor are horizontal, and all the individual cards are vertical in their slots.
This allows the heat generated to be dispersed throughout the case with various sucker/blower fans strategically placed, and not adding to the the heat of the object positioned above it, as in the case of "Tower" cases....

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The worst sufferer in a Tower case is the power supply which collects all the heat from the objects below it...

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My Desktop power supply, processor, graphics card, etc disperse their heat independent of each other...

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...you know it makes sense...

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LOL...!
Paul...The Desktop* enthusiast...

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* ...with a little help from my secretary...

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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.