Iris graphics for external monitor (dual graphics)

[bonro001]

Hello all. I have a Mid 2014 MBP with dual graphics cards. I want to see if maybe the Iris graphics might be faster at some tasks while hooked to a external monitor. Is there a way to do this? (I know the units with a single GPU can drive external monitors, but with dual it seems to only be allowed while using the 750M)

Thanks!

 

[MagicBoy]

Using an external display automatically uses the dGPU.

No option to override it.

 

[bonro001]

Thank you, sadness. Have been reading a ton about how good the Intel graphics are, curious if it would be better in gaming.

 

[MagicBoy]

Generally speaking the 750M is usually around 25% quicker than the Iris Pro.

 

[yjchua95]

Thank you, sadness. Have been reading a ton about how good the Intel graphics are, curious if it would be better in gaming.

The 750M is still way better in gaming.

But the Iris Pro works better in OpenCL tasks.

And on models withe the 750M, the Iris Pro isn't physically connected to the Thunderbolt port, so the 750M has to be used when driving external displays.

 

[maflynn]

I want to see if maybe the Iris graphics might be faster at some tasks while hooked to a external monitor.!

You can't use the iGPU on an external monitor. Its dGPU is hard wired and there's no way around it.

Thank you, sadness. Have been reading a ton about how good the Intel graphics are, curious if it would be better in gaming.

the dGPU is still better then the Iris Pro, especially at games.

 

[x3n0n1c]

Generally speaking the 750M is usually around 25% quicker than the Iris Pro.

In gaming the difference is usually closer to a 75-100% speed increase over the Iris Pro.

Just as an example, in CineBench r15 I get 32-33fps with the Iris Pro and 60 FPS with the 750m. In Unigine Valley its ~15 FPS vs ~25 FPS.

 

[MagicBoy]

In gaming the difference is usually closer to a 75-100% speed increase over the Iris Pro.

Just as an example, in CineBench r15 I get 32-33fps with the Iris Pro and 60 FPS with the 750m. In Unigine Valley its ~15 FPS vs ~25 FPS.

Source?

I was looking at barefeats.

 

[x3n0n1c]

Source?

I was looking at barefeats.

My actual results from my laptop, they aren't from a third party.