Two different Asus cards won't work with integrated GPU

[jkauff]

I bought an Asus R9 270x card last week, but it would only work if I disabled the HD4000 iGPU on my 3570K. Otherwise I got a black screen on boot up, or the computer froze if I enabled it in Windows.

I returned it, and bought an Asus GTX770 card, because my former Asus GTX660 worked fine with the iGPU. Surprise--same problem.

Does anyone have any idea why this is happening? I have a 650W power supply, which seems like it should power the dGPU and the iGPU with no problem, but since I'm also overclocking the CPU maybe I need a more powerful PSU. If that's not the problem, I'm stumped.

 

[ShintaiDK]

Something in your BIOS I assume.

 

[jkauff]

I'm using the same BIOS settings as I did with my GTX660. I've tried other settings with no luck.

 

[Stuka87]

Your PSU is not the problem.

What exactly are you trying to do? Are you trying to run multiple displays? There is no reason to have the iGPU on if you are only using the discrete card.

 

[jkauff]

Your PSU is not the problem.

What exactly are you trying to do? Are you trying to run multiple displays? There is no reason to have the iGPU on if you are only using the discrete card.

No, I want to use Intel QuickSync to encode/decode videos, which I did with no problem on my old setup.

 

[Stuka87]

Does the software you are using not support using a real GPU? They may be a bit slower, but the video quality will be better.

 

[jkauff]

Does the software you are using not support using a real GPU? They may be a bit slower, but the video quality will be better.

There are encoders and decoders that support CUDA on Nvidia boards. However, the quality of a CUDA encode is not as good as QuickSync (the best quality is done using software only, but it's also extremely slow). As far as decoding goes, QuickSync can decode many more frames per second than CUDA. Again, software is best, but it eats up CPU cycles that you may need for other uses.

Software like VirtuMVP integrates the iGPU and dGPU, but depends on both being active at the same time (which requires a compatible BIOS).

Again, this is a very common use case. My GTX660 worked just fine with the iGPU enabled. It's just these new boards that seem to be incompatible, and I can't understand why.

 

[jkauff]

After doing some research, I'm starting to think that the newer generations of both AMD and Nvidia cards don't support co-existence with the iGPU.

 

[jkauff]

Bumping this old thread because I found a solution that might be helpful to someone with the same problem.

I connected my second display to the HD4000 instead of the GTX 770. Still didn't work until I set the iGPU as the primary display in my BIOS. The boot info now displays on the second monitor, but as soon as Windows loads it switches to my main monitor on the GTX 770 as the primary display (I have it set that way in Windows).

The iGPU and dGPU now co-exist nicely, and QuickSync works perfectly.