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Old 2014-10-21, 16:48   #1
Red Raven
 
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Default Can I run my CPU's integrated GPU along with my discrete GPU?

I have a Sapphire R9 280x dual-x GPU and an Intel i5-4460 Haswell Refresh CPU. I'm currently running my computer off of the 280x and it's handling mfakto. I'm wondering if it's possible to boot my PC with the 280x and the i5's internal GPU active, run the PC off of the 280x, and run separate instances of mfakto on both. I know the i5 couldn't do much compared the to 280x, but it's not doing anything right now. I'd intentionally feed it low bit levels.
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Old 2014-10-21, 23:15   #2
TheMawn
 
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Unless I've misunderstood, the question can be simplified to:

"Can I run mfakto on the integrated GPU?"


There really isn't anything like "Running the PC off a certain GPU." Whichever source of video your monitor is plugged into is going to send a display signal.


There were some attempts to run mfakto on the iGPU because it has OpenCL support but I believe they weren't successful.
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Old 2014-10-22, 01:09   #3
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Quote:
Originally Posted by TheMawn View Post
Unless I've misunderstood, the question can be simplified to:

"Can I run mfakto on the integrated GPU?"


There really isn't anything like "Running the PC off a certain GPU." Whichever source of video your monitor is plugged into is going to send a display signal.


There were some attempts to run mfakto on the iGPU because it has OpenCL support but I believe they weren't successful.
mfakto works on Intel iGPU's on the latest code in github. Probably official support in 0.15.
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Old 2014-10-22, 01:39   #4
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Quote:
Originally Posted by kracker View Post
mfakto works on Intel iGPU's on the latest code in github. Probably official support in 0.15.
:surprised

How did I miss that? Was there a thread on this somewhere I could catch up on? I'm interested in the performance.

Last fiddled with by TheMawn on 2014-10-22 at 01:39
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Old 2014-10-22, 02:17   #5
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Quote:
Originally Posted by TheMawn View Post
:surprised

How did I miss that? Was there a thread on this somewhere I could catch up on? I'm interested in the performance.
From about here roughly in the mfakto thread I believe. Also, see this.

Performance is what you would expect from a integrated GPU(except for APU's)...
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Old 2014-10-23, 05:17   #6
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Quote:
Originally Posted by TheMawn View Post
Unless I've misunderstood, the question can be simplified to:

"Can I run mfakto on the integrated GPU?"


There really isn't anything like "Running the PC off a certain GPU." Whichever source of video your monitor is plugged into is going to send a display signal.


There were some attempts to run mfakto on the iGPU because it has OpenCL support but I believe they weren't successful.
So if I boot my computer with the monitor plugged into the 280x, unplug the 280x, and plug the monitor into the motherboard's video port, my i5's iGPU will activate and take over? Will the 280x switch off? I don't just want to run mfakto on the iGPU though. I want to plug the monitor into the 280x and run two instances of mfakto at the same time, one on the 280x and one on the iGPU.
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Old 2014-10-23, 22:57   #7
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The GPU doesn't need to be "displaying" to run.

You'll just be using a -d switch (if you're in Windows) to force the instance onto a particular GPU.

Code:
start E:\...\GTX660Ti\mfaktc660ti.exe -d 0
Code:
start E:\...\GTX670\mfaktc.exe -d 1
I have two batch files that are literally just that line of code. the -d 0 and -d 1 at the end are what mfaktc (and I would imagine mfakto) uses to force a particular GPU. GPU 0 is my GTX 660 Ti and GPU 1 is my GTX 670.

I think it's trial and error to figure out which is which. They're likely going to be 0 and 1.
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Old 2014-10-24, 00:19   #8
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Well, no.

Maybe it's because the drivers are different, but the monitor has to be connected to the MB display port for mfakto to detect the iGPU. However, after that you can switch back to whatever you usually do after you've started mfakto.
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Old 2014-10-24, 01:43   #9
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If your monitor has multiple connection options, you could connect a second input of your monitor to the iGPU. This will trick Windows into "extending" the display to the second monitor which you don't actually have.

One side-effect, unless you can get around it, is that your cursor will only be bounded by three of the four edges of your monitor.

Last fiddled with by TheMawn on 2014-10-24 at 01:43
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Old 2014-10-24, 02:01   #10
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http://www.overclock.net/t/384733/th...ond-dummy-plug
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