I removed the Alphacool Core because it started showing signs of corrosion. I was also never a fan of cheap acrylic materials.
I used TG Liquid Metal Extreme and secured the GPU core with Kapton tape. I’m very happy with the results. It was somewhat experimental, as the GPU block is actually designed for PNY. However, I’m using it with an MSI RTX 5090 VENTUS 3X OC.
I strongly recommend it in terms of both performance and build quality. The only issue is that Optimus provides 0.5 mm thermal pads, whereas you need 1 mm pads to create sufficient pressure on the memory modules.