The Dell OptiMac Big Sur/OpenCore Thread - For 7020/9020 Optiplex Desktops

[trs96]

In haste to get a OC install done I missed the post!

What happened exactly ? Did you try to mod the newest 3020 BIOS and it failed ?

 

[sonicman66]

Actually, I was trying to mod it for nvme bootable drive (via winraid website) first and thought I might as well do the BigSur mod also.

unlucky though

 

[trs96]

unlucky though

Does it still boot or is it bricked ? If you have the MT 3020 it's easy to replace the board with a 7020 MT board. The only important thing missing will be the temp. sensor cable. Without it you'd need some other way control the CPU fan speeds.

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[sonicman66]

The bios mod failed, so I never tried to flash it. I was hoping I could accomplish the same thing with the efi shelll, but now I see its not possible. I might try with another board. I do not have a 9020 laying around. Any other good candidates?

 

[trs96]

Any other good candidates?

See revised post #36 above.

 

[sonicman66]

Looks like it will fit in my 7010 case just swap the power supplies, I need to find a pic of my 7010 motherboard. Not at home currently.

 

[li3p]

Anyone upgrade to Big Sur? I found that after update the 4K display only support 30Hz refresh rate. Anybody have the same issue ?

 

[mgrimace]

@li3p I upgraded using a 7020 SFF OC system. Easy upgrade, however I found I lost 4k (60Hz is working, but max resolution is 2560x1600). In Displays in settings it now shows iMac where before it said Retina iMac... @trs96 this is using the settings that @nicksoph and I worked out previously.

 

[trs96]

@li3p I upgraded using a 7020 SFF OC system. Easy upgrade, however I found I lost 4k (60Hz is working, but max resolution is 2560x1600). In Displays in settings it now shows iMac where before it said Retina iMac... @trs96 this is using the settings that @nicksoph and I worked out previously.

I'm not using a 4K monitor on my Optiplex. I'm also holding off on Big Sur for a while yet.

 

[mgrimace]

I'm not using a 4K monitor on my Optiplex. I'm also holding off on Big Sur for a while yet.

Good call, for folks that do have a 4K monitor it looks like we’re just waiting on a WhateverGreen update