Intel has been designing GPUs manufactured on TSMC nodes across client and datacenter for at least the past 5 years. The client chips are price competitive but not performance competitive with AMD/NVIDIA/Apple. The data center roadmap has historically been a huge mess with cancelled products left and right. But, to say "Intel will start making GPUs" seems misleading. Perhaps "Intel to try to inject sanity into its GPU roadmap" would be a better headline, though I am skeptical one hire will do anything to fix 10+ years of mismanagement.
I have a B580 in my desktop. Unfortunately AMD still has broken PCIe level reset and so their GPUs don't work well for assignment to a VM, Intel and Nvidia cards both work fine.
The perf is fine - it was a $350 CAD GPU after all.
I am certainly interested to see where Intel ends up going with their lineup. Having a third player in the GPU space is definitely a good thing.
I have a B580 too. The cool thing about it is architecturally speaking it is basically a mini version of the Ponte Vecchio (PVC) datacenter GPU. You can run most of the datacenter GPU workloads, albeit scaled down to fit the compute/memory constraints of the B580. It's a great vehicle for software development. But you can't buy PVC anymore so it's unclear what you are developing for...