Before this thread is going to be closed and latest release mGPU, I noticed finally these thigbs :
- The integrated benchmark does not help us a lot … Results can vary up to 30% from a bench to the other. The more you add GPU, the more it varies. → Unreliable
- The benchamrk is too short, GPUs don’t even ramp up. In real situation we’ve got half of these results because of the need of thermal managment.
- RTX 3070 PCIe bandwidth used is 1.35 to 1.8 GBps with an average of 1.45 GBps. It fits in PCIe Gen3/4 x4 (edited)
Benchmarks curves, similar, but results aren’t.
Average taken from 4 best runs among dozens, light o/c on VRAM (+250)
Topaz Video AI v5.1.3
System Information
OS: Windows v11.23
CPU: AMD Ryzen 9 7950X 16-Core Processor 47.712 GB
GPU: NVIDIA GeForce RTX 3070 7.8301 GB
GPU: NVIDIA GeForce RTX 3070 7.8301 GB
GPU: NVIDIA GeForce RTX 3070 7.8301 GB
Processing Settings
device: 3 vram: 1 instances: 0
Input Resolution: 1920x1080
Benchmark Results
Artemis 1X: 29.39 fps 2X: 16.02 fps 4X: 04.53 fps
Iris 1X: 36.40 fps 2X: 18.02 fps 4X: 05.70 fps
Proteus 1X: 28.82 fps 2X: 20.00 fps 4X: 05.98 fps
Gaia 1X: 13.74 fps 2X: 09.27 fps 4X: 05.49 fps
Nyx 1X: 10.55 fps 2X: 13.24 fps
Nyx Fast 1X: 14.98 fps
4X Slowmo Apollo: 25.19 fps APFast: 58.26 fps Chronos: 25.35 fps CHFast: 20.52 fps
16X Slowmo Aion: 30.07 fps
What I’ve learnt
- For unknown reason, as soon as you are 2+ GPUs, the first one, never load 100%
- For unknown reason, it scales well only with to 2 GPUs
- For unknowm reason, it starts to deliver erratic results 3+ GPUs, some models raise up when other fall down …
I have benched and tortured all parameters, CPU, DDR5, PCIe lanes, cooling aos … this lead me almost to the same results than my 2990WX workstation, so …
This sounds to be a VERY particular case. Going to reproduce it and verify if true. I have finished a 5 day 8K master with tons of noise.
Will go for a mixed 3000 and 4000 series as a last try, even if it is not recommended.
NOTE : ASUS Prime X670-P is a pure sh**, tons of useless parameters to tweak CPU and VDDR, but MOSFET are crap. Not even more than one line to tweak PCIe lanes … unbelievable.
(edited : X670/E are all very poor supported with PCIe splitting, only slot 1 is tweakable whatever the brand 
I have to turn M.2 slots sot PCIe4 x4 slots, again new bucks flamed …)
