How to build your own iMac Pro [Successful Build/Extended Guide]

[ffltt]

I rised a ticket and discussion concerning SMBIOS iMacPro1,1 Clover Implementation.

See:

Ticket 434: https://sourceforge.net/p/cloverefiboot/tickets/

Open discussion: https://sourceforge.net/p/cloverefiboot/discussion/1726372/

You can comment/support the ticket or discussion, which would be highly appreciated!

I also asked mackie100 for SMBIOS iMacPro1,1 Clover Configurator Implementation:

http://mackie100projects.altervista.org/clover-configurator/#disqus_thread

His answer was, that this will be done, as soon as Clover will support SMBIOS iMacPro1,1.

Cheers,

KGP

Good news···

 

[chmiola]

@levifig , @flymovies

I don't understand which NVMe problem your are talking about?

@levifig , @flymovies

I really think what everyone is seeing is thermal throttling when the NVME drives are getting hot. I have a 960 EVO 250GB in the same slot under the heat shield on a Prime X299-A. When I start Disk Speed Test I get ~1300 Write / ~2500 Read, but after running the test for about 5 minutes it'll drop to ~600 Write / ~2000 Read.

 

[kgp]

@levifig , @flymovies

I really think what everyone is seeing is thermal throttling when the NVME drives are getting hot. I have a 960 EVO 250GB in the same slot under the heat shield on a Prime X299-A. When I start Disk Speed Test I get ~1300 Write / ~2500 Read, but after running the test for about 5 minutes it'll drop to ~600 Write / ~2000 Read.

View attachment 302454 View attachment 302455

Yes sir! You are totally right!

I also can confirm reduced NVMe read/write performance with increased benchmark duration.

We indeed have to deal with a thermal throttling of the NVMe, when plugged in the M.2 slot under the heat shield of the Prime X299-A or Prime X299 Deluxe.

 

[warphead]

Sounds to me like something is wrong with your usb... I can send you later something! Maybe this will help @warphead

okay Thank you

 

[antagon]

@warphead - I checked your Virus issue with my setup and I don´t have this behaviour. The Virus needs a few seconds to adjust on the Asus Prime x299 A.

I´m a Cubase user and I face the same CPU issues as everyone around here. I went through the procedure explained by @DSM2. In my case it leads to a Vcore Voltage of 1,165 for a 7900x @ 4.6GHz. Sadly it didn´t solve my Cubase issues. Maybe i missed something.

So I tried to enable the xcpm_bootstrap Sierra © Pike R. Alpha suggested by @spyderfyre (left out the other points!).
Afterwards I have proper power in Cubase 9.5 with the following CPU stats:
- 120 Watt
- constant 4,6 GHz
- 54°C


Just for fun i extended the AHCI_Intel_Generic_SATA.kext to work with the x299 platform. If someone wants to use it feel free to download the kext attached.
(If it has been done by someone else already i missed it so just ignore it .)

 

[warphead]

@warphead - I checked your Virus issue with my setup and I don´t have this behaviour. The Virus needs a few seconds to adjust on the Asus Prime x299 A.

thx for you respone, the strange thin is if i put the access virus on so on system profiler under audio he can not show the devices

So I tried to enable the xcpm_bootstrap Sierra © Pike R. Alpha suggested by @spyderfyre (left out the other points!).
Afterwards I have proper power in Cubase 9.5 with the following CPU stats:
- 120 Watt
- constant 4,6 GHz
- 54°C

thats absolut normal i have tell thats is no real solution but it give you the full power of your cpu

 

[antagon]

I just checked the Sytem Profiler. Same behaviour over here!

Indeed, the power management solution is not optimal, but as long as there´s no permanent fix I´ll use 2 configs, one for audio, one for regular work.

 

[kgp]

I just checked the Sytem Profiler. Same behaviour over here!

Indeed, the power management solution is not optimal, but as long as there´s no permanent fix I´ll use 2 configs, one for audio, one for regular work.

I would not call this power management solution. The workaround rather disables any CPU power management!

 

[warphead]

@warphead : Try this : https://www.dropbox.com/sh/rx8j6jkh2m3ec0p/AABMxTENqwYvD2F_aeyzeAQra?dl=0

Just put it in your EFI/Clover/Kexts/Other folder and reboot
Afterwards try again...

Thank for your help DSM2 but nothing change 1-2 minutes to load the virus plugin, hmm strange

 

[paulotex]

Followed the guide with my 7820X on an X299-A and it's working pretty well.
Things seem to be running pretty smooth. Got 36k+ in Geekbench (4.6GHz @ 1.2V) and I'm going to keep fiddling with it soon… I already bought a delid service; just have to find the time to send it in (this is my main PC).

Keep us posted with the deliding. I get similar performance with air cooling:
Geekbench: 5504 / 36366 @ 4.4GHz