[Need help] iMac 2012 with GTX970 eGPU in Win 10

[SHIH YI LIU 0]

Hi All

 

First, I'm from taiwan so please forgive my poor english....^^"

I'm trying to build eGPU, but GTX 970 just can perfect display in external screen.

even if I disable 650m(dGPU) still can't display in internal screen. (no black screen, but restart OS will get error need to repair)

 

List my install step below

1.clean install win10 by bootcamp

2.install boot camp driver

3.windows update to newest patch

4.install newest nvidia driver 368.81

5.reboot

 

after restart, I can see GTX970(eGPU) and GT650m(dGPU) at device manager

In nvidia experience also can see 970&650m

In nvidia control, 970&650m  list in CDUA

 

Question is

1.Is the optimus not working?

2.because boot Win10 in GPT not EFI?

3. any else

 

Many thanks.

[Tech Inferno Fan 20]

Your imac has no Intel iGPU, hence no NVidia Optimus. Quite rightly then your external LCD attached to your eGPU is working.

You can drag a *windowed* app started on the eGPU attached LCD to your GT650M-attached internal LCD.

 

[SHIH YI LIU 0]

@Tech Inferno Fan thanks for reply!

My iMac CPU is i5-3470s, I saw it have HD Graphics 2500 (Link)

something I get wrong or the CPU for iMac is Special specifications?

 

drag windowed app to internal LCD is good idea, thanks. 

 

[ssamydla 3]

14 hours ago, SHIH YI LIU said:

@Tech Inferno Fan thanks for reply!

My iMac CPU is i5-3470s, I saw it have HD Graphics 2500 (Link)

something I get wrong or the CPU for iMac is Special specifications?

 

drag windowed app to internal LCD is good idea, thanks. 

 

From what i've found, there is no iGPU on a 2012 iMac. Can you be more specific on the model? The latest iMac has iGPU since it's build on mobile processor

You should refer to a link for your iMac spec, not from Intel. Or simply go to About Mac> Sys Info. If there's Dual GPU, you'll see it.

http://www.everymac.com/systems/apple/imac/specs/imac-core-i5-2.7-21-inch-aluminum-late-2012-specs.html

 

[EDIT] if you're on an iMac which is a desktop computer, why would you need Optimus? You can achieve more juice with AC power all time

Optimus only for Mobile Laptops:

https://forums.geforce.com/default/topic/521518/geforce-mobile-gpus/is-nvidia-optimus-in-all-in-one-computers-/

If you disable dGPU from the system, that is why it goes black screen and errors.

Nvidia has Maximus for Multi GPU Workstation, but only works for Quadro + Tesla cards

Edited August 1, 2016 by nando4
struck out misinformation

[SHIH YI LIU 0]

@ssamydla

 

Thanks for reply.

 

My iMac 2012 late spec: Link

Some people believe this CPU has iGPU and apple just disable it.

BTW, when I disable 650M "no" got black screen

In nvidia experience only show GTX970, but benchmark score very low....

[ssamydla 3]

I'm not sure if this related to your issue,

But there's performance issue with 970 back in 2014.

http://www.pcworld.com/article/2875740/nvidia-explains-geforce-gtx-970s-memory-performance-issues-admits-error-in-specs.html

http://www.gamespot.com/articles/did-you-buy-a-gtx-970-nvidia-owes-you-30-if-you-li/1100-6442239/

[SHIH YI LIU 0]

@ssamydla

 

Thanks for your information.

I think this not problem is, because benchmark score low than my 650m.

I also run benchmark in external LCD, Score is perfect.

Anyway, I'll try to search other possible answer.

Under the current situation, 2012 iMac's can't use optimus.

 

many thanks!