[DigitalJack]

You should look into thunderbolt external GPUs. The discrete GPUs in apple laptops have traditionally been out of date, out of the box.

Good enough for a lot of people, but if it matters to you, and you really want a mac, perhaps the external GPU is the option for you.

[IMcD23]

An external Thunderbolt 2 GPU will only run at the equivalent of PCI x4, while Thunderbolt 3 eGPUs will do enough bandwidth to have full GPU performance. eGPU driver support was added to macOS Sierra, so hopefully the new Macbook Pros with USB-C / Thunderbolt 3 will support eGPUs nicely.

[andrepd]

The technology is really not there yet. I have been considering changing my setup to a 13.3 light notebook with long battery life + an external GPU, but I'm still waiting on the technology to become mature.

[elmigranto]

Have you looked into Razor thing? They claim full PCI utilization, if I'm not mistaken.

[toyg]

You mean the Razer Core? It looks like it's announced on their website but not actually on sale.

EIT: It is actually on sale, but US-only (hence why I couldn't see it with UK settings).

[nroach]

There are no mass-market thunderbolt GPUs with fully-functional mac drivers at this point, are there? I've been looking and at best there are unsupported hacks.