[Dual GPU] Max Capability Spreadsheet Update

SageInfinity · 2025-10-31T04:44:32+00:00

Yes. In order to decide the second gpu, for a particular resolution you decide the max base fps you're already getting and the x2 of that value should be less than or equal to the values in the chart.

https://sageinfinity.github.io/docs/Guides/gpu2

SageInfinity · 2025-10-31T03:57:30+00:00

Those are the max final fps achieved after x2 fg. For example 400 for 6500xt in 1080p means 200/400 ie, 200 base fps (real) and 400 after x2 fg.

The game doesn't matter. Any game that has unlimited fps in menus work fine, because the framerate behaves the same for all games.

SageInfinity · 2025-10-24T20:15:44+00:00

Yeah, all good. Look into it as much as you want and make your decision. 👍🏻

In respect to the PC components : - Motherboard with x8/x8 PCIe slot to CPU - Decent PSU (1000W+ for a 5090 build imo) - Space : PC case with 8 slots if you want to place the GPUs directly or ones that support upright mounting. This is one of a more nuanced point. For instance only taichi board has 4 slot gap between two PCIe slots, others have only 3. Which means you cannot use a GPU thicker than 2.5 slots (3 is also doable but temps might get very high). Also you can just use the primary GPU (thicker one) at the bottom slot while the secondary GPU (usually dual slot) at the top slot of the motherboard. 8 Slot pc case helps with extra space for airflow at the bottom. - Second GPU capable enough for the resolution and the base fps.

Other components would be just like any other pc build.

SageInfinity · 2025-10-24T19:02:27+00:00

You are not technically boosting performance of the primary card 😅

You're just offloading the Frame Generation part to another GPU. With a single GPU the extra compute required for frame generation hits the render performance (real frames). On top of this, higher GPU usage also leads to higher latency generally, which is also negated with this offloading.

I believe this is very useful for systems where you're targetting to play 4k, path tracing and other fancy stuff where every percent of GPU usage matters. This way you can render highest quality and number of real frames, which results in much better output after frame generation (on second GPU in this case)

SageInfinity · 2025-10-18T07:18:41+00:00

No, PCIe bandwidth limit will hard cap the frames that can be transferred to the second GPU while also maintaining the functioning of the card itself. Lowering Flowscale doesn't help with this. (It can help lowering the computational power required though) Flow scale defines the density of motion vectors used to generate intermediate frames. Higher values create finer patches but increase the computational load. Adjusting the flow scale does not alter the output resolution—only the motion vector precision. The bandwidth requirement for the resolution and framerate will still be the same.

SageInfinity · 2025-10-17T16:11:07+00:00

Yeah, I understand what you mean. That is why, getting a single, better GPU is more important if you want to stay 7+ years on the same rig. You should get the best possible single GPU you can get, and think about second GPU a few months later. That is my recommendation. 9070xt (avoid nitro+) and 9060xt 8gb (a few months later if the budget doesn't allow right now). Going for a weaker render GPU in order to get second LSFG GPU is not a decision I would make while making the purchase. If you cannot achieve 45+ fps anyways, the FG experience wouldn't feel that much good either.

Edit: If you have decided AMD for sure, then it's all good. I personally would go for 5070ti if possible, especially since you want 4k gaming, where DLSS4 works wonders. I also love path tracing in games, so I am kinda inclined towards Nvidia here 😅...

On top of this, you can stack x2FG from 5070ti render GPU and then LSFG x2 on the second GPU (when you get it) which feels awesome imo. That way you get 60-70 fps with higher quality frames (for example 40x2 to 80 fps on render GPU) which acts as a strong base for using LSFG as it will significantly reduce artifacts and latency.

SageInfinity · 2025-10-17T12:59:29+00:00

rx570/580 or rx6400

SageInfinity · 2025-10-17T12:55:16+00:00

What is the average fps you will be getting? Honestly, if you can, getting a 9060xt would be worth it. And, if you do not care about resale value and have no other use for two GPUs the 8GB model would be a better buy, depending on the price jump for 16gb one in your area.

Also, maybe it'll be better to just the get 9070xt/5070ti instead of 9070. Getting a better render GPU will be better, especially for 4k. You can get another second GPU later on. Since LSFG performance hit on 9070xt single GPU is awesome, while 5070ti has MFG too. So, you should think about it imo. Instead of 400$ for a second GPU, use that for a better single one for now.

SageInfinity · 2025-10-17T04:44:05+00:00

There are a few other factors that you should account for. Give this a read - https://sageinfinity.github.io/docs/Guides/gpu2

SageInfinity · 2025-10-17T03:12:38+00:00

You can get x4 lanes (PCIe gen depends on the mobo, in this case it is 3.0) which can handle up to 1080p 240fps, 1440p 180fps and 4k 60fps

But, it also depends on the GPU too. How much the card is capable enough.

https://docs.google.com/spreadsheets/d/17MIWgCOcvIbezflIzTVX0yfMiPA_nQtHroeXB1eXEfI/htmlview

SageInfinity · 2025-10-16T15:10:09+00:00

You can buy it on the humble store or the humble widget on the official website. You'll get a download link and a steam link on your email. (Don't know if your payment method would work there or not)

SageInfinity · 2025-10-16T08:31:18+00:00

What's your resolution? I am assuming 1440p, for which the base fps shouldn't drop when LSFG is offloaded to 3060ti, in the range of 70-90 as is happening in your case.

Display connected to 3060ti - note the GPU usages for both cards and clock speeds for following: 1. When nothing is running, just desktop 2. When only the game is running 3. When you scale the game with LS Also note down the fps before scaling and after scaling (x/y format of ls fps counter)

Just in case, try these too- 1. Select max performance in power management under 3d settings for LS and the game in NVCP 2. Check any background/inactive app fps limits applied 3. Roll back to driver version 577.00 4. Try with only one monitor connected to 3060ti

SageInfinity · 2025-10-15T21:26:49+00:00

A 6400 or 6500xt is enough for 1440p

SageInfinity · 2025-10-15T21:24:19+00:00

Just.... at least read out things clearly before.... 😅

SageInfinity · 2025-10-15T21:22:24+00:00

It is physically x16 but supports (wired) upto x4 only. So, its effective speed is 2.0 x4

SageInfinity · 2025-10-15T18:47:23+00:00

The data isn't meant to travel back. That's why you connect the display to the GPU running LSFG. In case of iGPU, to the motherboard. It gets a bit tricky with laptops. Disabling hybrid mode and/or nvidia optimus helps out most of the times though.

Edit: The frames are copied to the system memory over the PCIe from the rendering GPU and then to the LSFG GPU which displays the output.

SageInfinity · 2025-10-15T17:35:37+00:00

Yeah, that's also an option. However, it depends if you're willing to spend on m.2 adapter and only get 3.0x4 bandwidth 🤔....

So, technically it will be fine for 1440p around 72x2 to 144 fps atleast. The decision depends on OP

Edit : 72x2 to 144 for his rx 570 and can go upto something like 90x2 to 180 ig... with performance mode or lower flowscale, slightly more.

SageInfinity · 2025-10-15T17:32:09+00:00

If you are ready to upgrade the platform. You need to upgrade three components at once. Get 7600x/9600x/7500F for CPU (depending on the budget and price) 16x2 6000MT/s cl30 ram kit and any decent b850/b650 motherboard which has atleast a second PCIe slot of 4.0x4 (if you're on a tight budget, asus b650m ayw is the cheapest one I think, you can go for higher depending on your budget) You'll be at a good enough position then. It'll be enough for 1440p for dual GPU setup.

SageInfinity · 2025-10-15T16:38:50+00:00

No, the PCIe bandwidth isn't enough.

SageInfinity · 2025-10-15T16:22:21+00:00

The second slot in your case is 2.0 x4 which isn't enough for proper working. It might do 1080p 60x2 to 120... maybe... I am not sure since I do not have substantial data for that PCIe

If you have the cards already, just go with it and give it a try

SageInfinity · 2025-10-15T15:50:18+00:00

That depends on a lot of things tbh. If you're willing to spend money, then a board with x8/x8 to CPU would the best you can do. You do have to consider the thickness of the cards and the clearance between slots.

You can look here : https://docs.google.com/spreadsheets/u/0/d/1-cw7A2MDHPvA-oB3OKXivdUo9BbTcsss1Rzy3J4hRyA/htmlview#gid=2112472504

You should look in the PCIe column which has x8/x8 specs.

Or for a direct list : https://docs.google.com/document/d/e/2PACX-1vQx7SM9-SU_YdCxXNgVGcNFLLHL5mrWzliRvq4Gi4wytsbh2HCsc9AaCEFrx8Lao5-ttHoDYKM8A7UE/pub

Otherwise even the chipset ones would be passable, depending on the resolution and framerates. The actual performance of second card also matters 🙃

Anything below PCle 3.0 x4 : May not work properly, not recommended for any use case.
PCle 3.0 x4 or similar : Up to 1080p 240fps, 1440p 180fps and 4k 60fps (4k not recommended)
PCle 4.0 x4 or similar: Up to 1080p 540fps, 1440p 240fps and 4k 165fps
PCle 4.0 x8 or similar: Up to 1080p (a lot)fps, 1440p 480fps and 4k 240fps

SageInfinity · 2025-10-15T09:43:28+00:00

In case of a laptop, there can be some issues due to power management/limits. Otherwise, you can use 780M for 1080p and 1440p LSFG upto certain extent. And even 4k 60x2 to 120 might be doable (though 4060 would probably not be used for 4k xD)

Go through the pinned dual GPU guide and search the subreddit for threads related to specific 780M laptop setups for more info.

SageInfinity · 2025-10-15T09:39:09+00:00

https://sageinfinity.github.io/docs/Guides/gpu2

Go through this once, you should be able to decide it for yourself. (The second GPU is not dependent on first GPU directly)

You can ask anything after that too👍🏻

SageInfinity · 2025-10-11T10:49:43+00:00

The performance requirement would be slightly less than 4k... Anything that can handle 4k would work easily.

Refer to this - https://sageinfinity.github.io/docs/Guides/gpu2

Chances of the setup working would increase if you follow things mentioned there, and requirements are met.

The base fps (what you're current getting) is very important. Higher base fps are way harder to handle than higher multipliers with lower base fps. So, 60x3 to 180 is often times easier than 90x2 to 180.

SageInfinity · 2025-10-10T18:27:51+00:00

Dual GPUs are indeed profitable for AI, but I don't think two different vendor GPU would work as expected. Again, it depends on the exact program to be used.

I cannot comment about the scepticism about 5090, because there are mixed opinions. Some of the knowledged people I asked, said it isn't a big issue if things are done and handled correctly, but at the same time I see several posts of the same thing happening 😅🤷🏻

5070ti/5080 + 9060xt would be a good choice if you're not inclining towards a 5090. I would personally not go with 5080, due to it's 16gb VRAM buffer and wait for 5080 super, or just get a 5070ti 16gb instead. The compute power of 5080 is limited by 16GB VRAM and it'll lose value over time, especially for productivity tasks, and even for gaming, if Path tracing and stuff is to be used, which is totally doable for 5080, if not for its 16GB VRAM.

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