4 of the current Grid K520 GPUs in a single instance, at 4x the price (on-demand and spot) of the of the g2.2xlarge.
Shame they're not also rolling out a Maxwell hardware-backed instance type.
They're not even Grid K520s, they're K5000s. They've only got 4 gigs of RAM each, instead of the 5 gigs for teslas or 8 gigs for the K520s. This sounds a lot like they're trying to pull a little bit more value out of their current gpgpu rigs as they slide further and further into obsolescence.
Edit:
Looking again at the pricing and specs, it looks like they're just letting you have a full gpgpu box, instead of the multi-tenant box they previously offered where you share with three other people.
Well, the K520 is a single AIB with two discrete GPUs on it, each being a GK104 with 4GB (which seems to match the spec of the K5000). A g2.2x instance has a single GPU - ie half a K520 - assigned to it.
Your claim surprised me enough to stand an instance up and take a look for myself. Sure enough, they report having 4 K520 devices.
Gotcha. I was looking at the spec sheets of the various instances, and could only find that they are GK104s. I didn't think to look to see if there was a dual GK104 board, because video card makers tend to do that only for their high end boards. Definitely makes sense, though, for the density Amazon would want to run in.
Edit:
Looking again at the pricing and specs, it looks like they're just letting you have a full gpgpu box, instead of the multi-tenant box they previously offered where you share with three other people.