ThinkPad

I have a BASE model T14 gen 1 (1366x768 screen, lowest end i5, base ssd etc) and I was wanting to eek out a bit more performance out of this machine. It's quite thermally constrained with longer loads despite being the base model, and it's fan seems to barely move any air at all.

I know along with other T series you can install the heatsink from the higher end models with dGPUs and get much better cooling. Has anyone here done the same and can report back on performance differences?

Part No 5H40W36701 is the heatsink I have. Part No 5H40W36700 appears to be the model for the dGPU macines. Lenovo lists it as $61.16 for this part, but ebay has them for a little over $30. So the next question is it enough of a difference to justify it?