See this page:
https://www.blender.org/manual/render/cycles/features.html


​
>
*Supported Features and Limitations*


> For an overview of supported features, check the comparison in the
> Features.


> *CUDA:*

​​
> The maximum amount of individual textures is limited to 88 byte-image
> textures (PNG, JPEG, ..) and 5 float-image textures (OpenEXR, 16 bit TIFF,
> ..) on GTX 4xx/5xx cards, and 145 byte-image textures and 5 float-image
> textures on GTX6xx cards and above.



*OpenCL:*

​            ​
> No support for HDR (float) textures at the moment.

​
>

Go for a nvidia card.

On Wed, Mar 16, 2016 at 10:54 PM, Gerbrand Nel <[email protected]> wrote:

> Hey guys
> This is probably not the right place for this question, but I figured
> some of you use blender, and might be able to help.
> I am looking at gpu options to render through cycles, and nvidia seems
> to be the safe option, but our scenes are using about 5gb of ram, so my
> 980ti is getting close to the useless point.
> I cannot justify buying a bloody titan card, so i'm wondering if the AMD
> r9 390 with its glorious 8gb of ram could be the answer.
> Anyone here have an amd gpu and render through cycles from time to time?
> I would love to know if there are limitations.
> Thanks
> Gerbrand
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