How does 4 GPUs SLI work?

[DarkMesa]

I saw the video where Lukes makes a 4 Titan XP build.

I was wondering how it worked exactly? I don't think there are motherboards out there that support 4 Graphic Cards or am I wrong? Also, how was the performance so poor? Bottleneck or because they were just not meant to be used 4 at a time?

[CyberFern0]

No there are. Look up Thirty IR

[Enderman]

Yes there are motherboard with enough slots for all those cards.

Multi-GPU performance scaling sucks in most games. Having 2 GPUs does not mean you get 2x performance.

It's hard to program a game that can use two separate GPUs at one, which is why the majority of games don't even support multi-GPU.

This is why Nvidia no loner supports 3 and 4 way SLI, and hopefully soon gets rid of 2 way SLI as well.

 

[79wjd]

There are plenty of boards that support 4 GPUs, but 4-way SLI isn't (officially) supported as of Pascal and the scaling is actually shit. 3-4 GPUs might be 10% faster than 2 GPUs or might even perform worse.

[DarkMesa]

1 minute ago, djdwosk97 said:

There are plenty of boards that support 4 GPUs, but 4-way SLI isn't (officially) supported as of Pascal and the scaling is actually shit. 3-4 GPUs might be 10% faster than 2 GPUs or might even perform worse.

Then why is it possible to use 4 at once? Media rendering, bitcoin mining...?

[CyberFern0]

3 minutes ago, Enderman said:

Yes there are motherboard with enough slots for all those cards.

Multi-GPU performance scaling sucks in most games. Having 2 GPUs does not mean you get 2x performance.

It's hard to program a game that can use two separate GPUs at one, which is why the majority of games don't even support multi-GPU.

This is why Nvidia no loner supports 3 and 4 way SLI, and hopefully soon gets rid of 2 way SLI as well.

 

Wait so most games don't even perform better with 2 cards?

[Enderman]

1 minute ago, CyberFern0 said:

Wait so most games don't even perform better with 2 cards?

Most games don't support more than 1 card, unless all your play are triple A games, since most of those do.