Video card shroud poorly designed

[Soyo13]

I see many poorly designed video card shroud that isn't designed to exhaust ALL heat out of the vent in the rear. But instead dumps a lot heat inside the case? Why cant they make it so the shroud seals around the vent opening so all the heat go out that way?

 

[Siryak]

I see many poorly designed video card shroud that isn't designed to exhaust ALL heat out of the vent in the rear. But instead dumps a lot heat inside the case? Why cant they make it so the shroud seals around the vent opening so all the heat go out that way?

That one is quite simple. The less resistance to air flow the more air it can move, which equals better cooling. That is why aftermarket coolers that absolutely destroy reference coolers do so much better. They exhaust most of the heat into the case instead of trying to push it out a tiny vent.

 

[limitedaccess]

You need to look at the entire cooling solution as a whole. It isn't a simple case of just "sealing" the shroud resulting in the same performance while exhausting heat out of the case. For instance you can compare to the Twin Frozr used by MSI which achieves better cooling at the same noise levels for the GPU itself compared to reference cards due to not worrying about exhausting heat out of the case.

The reference card uses a "blower" type fan and is designed around intaking air on one side and blowing it horizontal across the card over the heatsink fins and exhausting out the other end. Whereas something like the Twin Frozr relies on fans pushing air downwards.

 

[Medion]

Exhaust doesn't work properly without an intake. The way the fan spins causes it to take in more air from that area than it exhausts. If you sealed it out, it would cause a vacuum inside the shroud. That would cause problems for airflow.