"especially when you need to make sure that 30+ year-old code still work like it's the case in HPC"
Most code that works on Intel works on AMD. It's rare that it doesn't. The HPC vendor will have low risk on migration + get a bunch of competing accelerators at various price points for their problem. This is quite an incentive to move even if there would be stragglers.
Most code that works on Intel works on AMD. It's rare that it doesn't. The HPC vendor will have low risk on migration + get a bunch of competing accelerators at various price points for their problem. This is quite an incentive to move even if there would be stragglers.