Blur looks wrong when using GPU to render instead of software

[davids58395606]

You can see on the above what it looks like with the GPU rendering enabled

and below is what it looks like when it's software only

Any reason this doesn't work properly and is there a way around it other than turning off GPU rendering which is just a pain?

[davids58395606]

Anyone have an idea? This is causing my video to take over an hour to export without the GPU and I can't figure out why it would be happening

[davids58395606]

Premiere Pro 14.7

Windows 10, AMD Ryzen 7 1700X, 16GB Ram, GTX1070

[R Neil Haugen]

So with the GPU it's just not blurred quite as far ... ? Or ... what? Other than the scale of the two images is not the same here, it's very hard to see any difference.

Neil

[davids58395606]

Hey if you look at the blacks when the GPU is enabled, they look horrible it basically clips all the blacks as if you turned the blacks down and adds a lot more noise to it

[davids58395606]

Here's a second example 

The blacks are clearly wrong and shouldn't be acting like this when a blur is added, and it works fine when it's software only

[Andy 1968]

Some Adobe filters will give a tad bit different result between GPU and software only mode. 

[davids58395606]

But it's not just a tad different the one with GPU is just plain wrong, it clips all the blacks and adds noise and looks horrendous, may be hard to see but if you look here - 

the blacks are clearly wrong and shouldn't appear like this

[davids58395606]

So I guess just chalk it up to another horrendous looking bug

[Sami Succar]

Have you tried using a different blur effect? You got the same result?

[davids58395606]

Yeah it's just the difference between GPU and software but exporting with software is a pain

[davids58395606]

Any knowledge on this yet? The blacks look absolutely horrendous with GPU and I don't have the privilege of waiting 6 years for a render with software only selected