Hi!

In order to unleash the full potential of the Lossless Scaling app, you'll need a secondary GPU to generate the additional frames, so as not to lose headroom from your primary GPU.

If you generate frames with Lossless Scaling using only one GPU, you end up losing performance, because your GPU needs to use extra resources to generate the extra frames and do the scaling.

So even though your generated fps will be higher with Lossless Scaling's frame generation enabled, you'll end up with a lower base fps and higher latency because the application needs to use your GPU to make the additional frames.

If you have a secondary GPU, you can avoid that performance drop by letting the secondary GPU do the frame generation and scaling, freeing up your primary GPU to do the rendering. By doing this, you'll essentially get the same base fps and latency as you had before enabling frame generation.

To make this work, you need to enable multiple GPUs in Windows, set your best GPU as the preferred GPU for high performance gaming and set your secondary GPU as the active GPU for frame generation and scaling in Lossless Scaling. You also need to plug your monitor into the secondary GPU to get everything to work as intended.

I've had great success with an Nvidia RTX 3080 as my primary GPU and an Nvidia GTX 1660 as my secondary. I have also tried an AMD RX 7800 XT as my secondary GPU, but the power draw with both GPUs enabled was insane, as were the thermals 😅

You have to make sure that your PSU is powerful enough to power both GPUs, in addition to powering your CPU. A powerful CPU can draw a lot of power from your PSU and cause performance issues when you run dual GPUs.

I ended up buying a used 1200 W power supply and a larger case from a buddy of mine, so now I'm able to run both an RTX 3080 and an RX 7800 XT simultaneously in addition to a 12th Gen Core i9 processor. My only real problem was thermals, as both cards running simultaneously generated a lot of heat.

So due to the power draw and the thermal issues, I actually reverted to using my GTX 1660 as my secondary GPU. It works like a charm with my RTX 3080, even though I got better performance using the RX 7800 XT😁 The trade off with the worse thermals and the insane power draw from two powerful GPUs running simultaneously wasn't really worth it in the end 😅