Hello AMD and community,
I have some tests that I would like to share with you for your future.
So, I have 2 Blender scene files:
1. RyzenGraphic_27 sample scene for Cycles
2. RyzenGraphic_27_prorender sample scene with modified shaders for look similar to Cycles file (RyzenGraphic_27)
I worked for 2 years with 4-core i7 + GTX 1070 (web driver) under HS 10.13.6.
The first scene was render for 6.30-6.50 secs with GTX1070 under 10.13.6 with Blender 2.80. The same hardware was able to render this on Windows 10 for 7.50-7.80 secs.
Now I move to RX 5700 XT under Mac OS 10.15.2, Blender 2.81a, Radeon Pro Render 2.1.1
First of all you should double test with RPR. Because first render take a time for sync objects. Always do the second render for real test performance (for the first Blender.app launch).
Second, be in attention to my injection of blender denoise node under compositor section. As I know, blender denoise work with CPU. You should uncheck this for just GPU test instead overall CPU+GPU performance for final scene.
The base concept of this test is final good looking picture. You can try to test blender denoise results & performance vs RPR denoise result & performance.
So, my scores are with RPR (RyzenGraphic_27_prorender.blend):
1. First launch (blender denoise off) 11.30 sec.
2. 2nd render (blender denoise off) 6.76 sec.
3. First launch (blender denoise ON) 11.98 sec.
4. 2nd render (blender denoise ON) 7.36 sec.
Lets try with PRP denoise:
1. 2nd render with "Edge Avoiding Wavelets" 7.22 sec. (bad result compare to blender denoise - noticeable artifacts)
2. 2nd render with "Local Weighted Regression" 8.69 sec. (veery bad results vs blender denoise - blurry image with artifacts)
3. 2nd render with "Bilateral" 7.08 sec. (bad result compare to blender denoise - noticeable artifacts & blurry)
4. Machine Learning - crash of Blender
So, basically in terms of final good picture you should forget about RPR denose. Just use inside blender denoise.
Overall performance of latest powerful 2019 radeon card (5700 XT, rdna, gddr6, 7nm...) with latest modern apple api (metal 2) on the pair with 3-old year middle nvidia card (1070 gtx) with bad drivers (nvidia web driver).
Lets try the same hardware with Windows 10:
1. First blender launch & render with 1070 GTX: 7.50 sec.
2. First blender launch & render with RX 5700 XT (RPR): 14.90 sec.
3. 2nd render with RX 5700 XT (RPR): 9.40 sec.
This is how look render with 2nd render under mac os 10.15.2 with 5700 XT and blender denoise: