Issues understanding GPU cooling.
Cooling the GPU itself is no different than cooling the CPU. However graphics cards also have components on them which also need cooling, such as the VRMs. Your motherboard's CPU VRMs have heatsinks on them, your graphics card's GPU VRMs do not, if you take the stock cooler off and strap a water block to the GPU like you would with a CPU. So we have full-cover water blocks for them.
The principles behind CPU water cooling work exactly the same with GPUs, but you can't literally use CPU water blocks with them because they don't physically fit, usually.
Yes, between many cheap graphics cards the circuit board is the same and the only difference is the cooling solution. However, high-end graphics cards often use a custom circuit board with superior VRMs, and a cooling solution won't help you catch up to that with a cheap card.
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