I'm beginning to think about doing my own dodgy cooling on my lower power kit. For instance I have a Via C3 integtrated CPU motherboard which has a tiny heatsink and loud fan. I've currently replaced it with a large chipset heatsink which happened to have the same mounting diameter. It's really hot so I am thinking of getting a bigger one and maybe a large slow fan on the case. It's got me thinking whether anyone has ever made their own CPU / GPU / RAM / VRAM heatsinks out of things like:

For a CPU or GPU, it has a 50mm height which is the largest I've come across so far (cut the length/width it to size)
https://www.ebay.co.uk/itm/Aluminum-Heatsink- … b2t1Y:rk:9:pf:0
https://www.ebay.co.uk/itm/2X-100x69x36mm-Alu … T6/332872165362

For V/RAM, these are the largest (vertical) I can find.
https://www.ebay.co.uk/itm/Aluminium-28-x-20- … cs/362275975180

Stuck on the chip with (if no mounting holes obviously)...
https://www.ebay.co.uk/itm/Double-Side-Therma … MM/132899660521
Or just one long, narrow strip of the first heatsinks.

In particular I have a MX440 which has a chipset heatsink on it (I've had a lot of dead motherboards recently 🙁 ) which I was looking to replace with a larger heatsink.

I suppose my main concern is that these high heatsinks, whilst looking impressive, are quite industrial and aren't very "dense" and might not actually have a very large surface area for cooling. E.g a 30mm high heatsink with 8 fins would cool about the same as a 50mm high heatsink with 5 fins, as they have the same surface area (discounting materials, base thickness etc). The second heatsink I linked might be better at cooling.

So has anyone else played around with this sort of thing? added heatsinks to VRAM to help overclocking or anything?