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Rescale pricing: "Price as low as $0.04/core/hour" - if I am reading this correctly, training on a K40 Nvidia GPU (with nearly 3000 cores) amounts to about $100/hour. Bit pricey, no? Or am I not reading this right?

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the real price is "request for quote", so your number seems to be in the ballpark :)

I'd assume that is priced per CPU core (never seen anything priced per GPU core).

From memory the $0.04/hour is the base price for EC2 GPU spot instances.

Yes, you are correct. All our pricing is currently by CPU core. We are working on updates to make pricing more clear for GPU offerings.

Our rate for a single K40 at the moment is $6/hr.

(works at Rescale)

How do you plan on making your service's pricing competitive? Amazon's current spot market instances are ~30 cents per hour, which is twenty times cheaper.

For a faster GPU, that allows me to iterate more quickly, I'd be more than happy to pay an extra few bucks an hour.

I cannot comment on future per node pricing at the moment, but we are currently working on new offerings that should improve both performance (CUDA cores/node) and $/CUDA core metrics.

EC2 GPU spot instances average around $0.20 per hour in the cheapest region. On-demand instances are $0.65 per hour.

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