Can anyone tell me how I make integrated graphics do the video and discrete do GPUGrid?

I have a i5 4440 on a Asus Z87-K C2 Motherboard and if I enable iGPU it disables discrete GPU.

Thanks in advance.

In the BIOS is the setting to use the iGPU and you can also set which GPU is the main one.
iGPU works not on GPUGRID (yet), it does on Einstein@home but will negative influence the efficiency of the GPU with about 8% (on my rig).
At Einstein@home you have also all information about which Intel driver is best and how to extend your desktop so you do not need a dummy plug on the iGPU.
I can look it up for you if you want.

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Greetings from TJ

In the BIOS is the setting to use the iGPU and you can also set which GPU is the main one.
iGPU works not on GPUGRID (yet), it does on Einstein@home but will negative influence the efficiency of the GPU with about 8% (on my rig).
At Einstein@home you have also all information about which Intel driver is best and how to extend your desktop so you do not need a dummy plug on the iGPU.
I can look it up for you if you want.

Yes I have set in the Bios that iGPU is primary and enabled discrete GPU but while it loads a WU gpu load is zero maybe because I haven't extended desktop. I would like you to tell me how to do it without dummy plug if you would be so kind. Nvidia control panel is not usable with iGPU as primary and with no display connected to it.

I hope this will work for you, but I did the other way. I use my 780Ti as primary GPU and have a monitor connected to it. The iGPU is my third as there is a 770 as well. It works with dummy plug or monitor attached to the iGPU.

I used these driver: I installed the Intel drivers for the iGPU 15.31.17.64.3257 (9.18.10.3257)

Right click on the desktop, chose 'Screen resolution', click the Detect Button, then find the Intel GPU, and where it says Multiple displays 'No display detected' change it to 'Try and connect anyway on:VGA', the second Display in 'Multiple displays' selection must show the Desktop being extended onto it, (even is there no physical monitor) then restart BOINC.

If something is not clear I can perhaps try help more or someone else my step in, skgiven perhaps.

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Greetings from TJ

I hope this will work for you, but I did the other way. I use my 780Ti as primary GPU and have a monitor connected to it. The iGPU is my third as there is a 770 as well. It works with dummy plug or monitor attached to the iGPU.

I used these driver: I installed the Intel drivers for the iGPU 15.31.17.64.3257 (9.18.10.3257)

Right click on the desktop, chose 'Screen resolution', click the Detect Button, then find the Intel GPU, and where it says Multiple displays 'No display detected' change it to 'Try and connect anyway on:VGA', the second Display in 'Multiple displays' selection must show the Desktop being extended onto it, (even is there no physical monitor) then restart BOINC.

If something is not clear I can perhaps try help more or someone else my step in, skgiven perhaps.

Thanks for your trouble TJ your solution is spot on and works perfectly.

No trouble at all, glad I could help.

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Greetings from TJ