Dual GPU double Core&Memory Clock, or not?

[Frankie]

Hey, yeah, so.

I'm a noob at overclocking, much less overclocking GPU's, I haven't ever done any overclocking in real life, even, so that's not a big help.
My question is pretty much asked in the title, really.
Does Dual GPU double the Core Clock and the Memory Clock?

I was following this online build creator where you input benchmark scores you want or input the current parts, to get a suggested build of upgrade parts that would reach the score needed.
It's worked very well so far, only now I have this task to get 2147MHz GPU Overclock, and the build creator suggested using two GPU's that only reach 1600MHz Core Clock on their own.
I was under the impression that there being two of this GPU, that it would double the Core Clock too, making it 3200Mhz, but I seem to be mistaken, I think?

No matter how much I tried overclocking the GPU's, I still couldn't figure out how I was supposed to be able to up the 1600MHz Core Clock, I even tried Overclocking the two GPU's separately by putting one in to Overclock it, then remove that one to put the other one in and Overclock that, before I put the first into the case along with the second GPU, and that didn't work.

So, from my own troubleshooting of sorts, I have come to the conclusion that the Core Clock won't be doubled just because I put in a second GPU along with the first.
But, I'd still like to get other people's input, perhaps someone is more familiar with Overclocking, and can tell me if my conclusion is correct, or if there's something I'm doing wrong, or if there's some bug or whatnot.

Anywho, thanks for any replies!

[🦊Λℚ𝓤ΛƑΛᗯҜᔕ🦊]

Nope. When you run dual GPU's you only get one clock speed. Different cards can be different speeds but the speeds are not doubled. This is not a bug, this is how video cards work both in real life and in-game. A 1500 Mhz video card is still running at 1500 Mhz even in a dual-video-card configuration.

[Frankie]

Originally posted by Aquafawks:

Nope. When you run dual GPU's you only get one clock speed. Different cards can be different speeds but the speeds are not doubled. This is not a bug, this is how video cards work both in real life and in-game. A 1500 Mhz video card is still running at 1500 Mhz even in a dual-video-card configuration.

I take it that this means that the second video card doesn't really do anything to the PC in regards to the Core and Memory Clock, then?
If I understand it correctly, the only thing a second video card does, is making it so the two cards are sharing the load any application or program puts on the video card, making it so the video card(s) have an easier time doing the work?

[🦊Λℚ𝓤ΛƑΛᗯҜᔕ🦊]

Originally posted by Frankie:

I take it that this means that the second video card doesn't really do anything to the PC in regards to the Core and Memory Clock, then?
If I understand it correctly, the only thing a second video card does, is making it so the two cards are sharing the load any application or program puts on the video card, making it so the video card(s) have an easier time doing the work?

Pretty much that's it yep.

In real life: Putting two cards in a computer doesn't make either of the two video cards perform any faster than it would on it's own. But the computer is able to distribute the load across both cards. Where it might struggle to hit 60 FPS with one card, it might could hit it easily with two for example. But it's not perfect linear scaling. And it depends on lots of factors. Most of the time the games have to be coded to actually work with two video cards and then it all boils down to how well the developers coded the games and how efficient they are at the game's code. Not all games support dual-video card configurations at all in the first place. And some games may support it but only scale like +15% with a second card while other games that are very well coded for it may scale +85% with the second card. We'll never see perfect +100% scaling with a second card due to software overhead and all that. Even when it works you don't get double the video card's vram either. Two 8GB cards = still only 8GB available to games to use.

Basically how it actually works is one video card can render the top half of the game image and the other video card render the bottom half of the image then it gets composited back together as one whole image.

There's also the increased power draw and increased heat output from using two cards as well.

[Frankie]

Originally posted by Aquafawks:

Pretty much that's it yep.

In real life: Putting two cards in a computer doesn't make either of the two video cards perform any faster than it would on it's own. But the computer is able to distribute the load across both cards. Where it might struggle to hit 60 FPS with one card, it might could hit it easily with two for example. But it's not perfect linear scaling. And it depends on lots of factors. Most of the time the games have to be coded to actually work with two video cards and then it all boils down to how well the developers coded the games and how efficient they are at the game's code. Not all games support dual-video card configurations at all in the first place. And some games may support it but only scale like +15% with a second card while other games that are very well coded for it may scale +85% with the second card. We'll never see perfect +100% scaling with a second card due to software overhead and all that. Even when it works you don't get double the video card's vram either. Two 8GB cards = still only 8GB available to games to use.

Basically how it actually works is one video card can render the top half of the game image and the other video card render the bottom half of the image then it gets composited back together as one whole image.

There's also the increased power draw and increased heat output from using two cards as well.

I see, I never knew any of this. Well, not about the VRam, Memory Clock, or Core Clock stuff, so all of this is pretty interesting to have explained. And when I do think of it, it does make sense.

It's almost like our kidneys, I was told by the doctor that, while each kidney could work at 100% capacity, it was only ever when one of the kidneys had completely stopped working that the other would start working at 100% capacity.
Otherwise, they would work as close to 50%/50% as possible, or at the very least one would share part of the capacity, so you'd have something like 20%/80%, 30%/70% etc. In other words, the kidney's capacity would never exceed 100%, even though each one could essentially carry a 100% capacity by themselves.

Anywho, that probably got a little weird there, but I appreciate that you took your time to explain all of this to me, thank you for that :)