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Author Topic: The finishing touch  (Read 1530 times)
SMIKX
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« on: October 24, 2017, 09:35:56 PM »

When I first joined the Netkas forum I distinctly remember being absolutely awed and feeling completly not up to being able to flash my HD 5770.

Since then, thanks to everyone here I have successfully flashed 5 AMD cards and recovered an old bricked one too.

Learned a lot about hacking to run at 5.0 GT/s too but still an arcane art.

Now that I have boot screens I thought they too needed an upgrade - it's wonderful what one can do with icons now.

Cheers from Japan



* OS X Mavericks boot.JPG (42.11 KB, 1024x768 - viewed 326 times.)
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Mac Pro 4,1 upped to 5,1 Dual Quad Core 2.93ghz 17Gb 480Gb SSD TRIM enabled.
HIS HD 7950 3Gb 5.0 GT/s EFI on mDP to DVI + DVI to DVI.
10.9.5 - 10.12.6  - 10.6.8 - Win 7 not Bootcamp. 
AREA 2 port USB 3.1 & Inateck USB 3.0 4 port in OS X 10.9.5.
Rominator
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« Reply #1 on: October 26, 2017, 09:54:27 AM »

Great job !

We love people who figure stuff out
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Spacedust
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« Reply #2 on: October 27, 2017, 11:29:01 AM »

Great job !

We love people who figure stuff out

I was able to make working roms for eight different versions of XFX R9 280X cards and one XFX R9 280 which doesn't boot to macOS with default PC ROM.

Especially this R9 280 was a horrible card. It was working well with a different BIOS and then after adding EFI to it it refused to boot at all, probably there was some factory checksum error in UEFI. No chime, no nothing. I had to buy some miniITX PC board to reflash it and now it works well.

Some of these R9 280X had that strange issue with 2D flickering, then not only you had to match ROM with the same memory vendor and timings but also lower the memory clocks or find beta PC ROM with factory increased memory clocks.
« Last Edit: October 27, 2017, 07:44:16 PM by Spacedust » Logged
SMIKX
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« Reply #3 on: October 29, 2017, 12:37:32 PM »

Great job !

We love people who figure stuff out

Rominator,

It flows onto working out how other, non graphic card-rom things work, or break and then how to fix or improve them - in daily life as well.

Many thanks to Netkas, you &  Fl0r!an, jeanlaine and all the others.

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Mac Pro 4,1 upped to 5,1 Dual Quad Core 2.93ghz 17Gb 480Gb SSD TRIM enabled.
HIS HD 7950 3Gb 5.0 GT/s EFI on mDP to DVI + DVI to DVI.
10.9.5 - 10.12.6  - 10.6.8 - Win 7 not Bootcamp. 
AREA 2 port USB 3.1 & Inateck USB 3.0 4 port in OS X 10.9.5.
h9826790
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« Reply #4 on: November 25, 2017, 10:55:36 PM »

Great job !

We love people who figure stuff out

I was able to make working roms for eight different versions of XFX R9 280X cards and one XFX R9 280 which doesn't boot to macOS with default PC ROM.

Especially this R9 280 was a horrible card. It was working well with a different BIOS and then after adding EFI to it it refused to boot at all, probably there was some factory checksum error in UEFI. No chime, no nothing. I had to buy some miniITX PC board to reflash it and now it works well.

Some of these R9 280X had that strange issue with 2D flickering, then not only you had to match ROM with the same memory vendor and timings but also lower the memory clocks or find beta PC ROM with factory increased memory clocks.

If that 2D flickering issue is the same as the Sapphire 7950 Mac Editing card. Then there is a permanent fix.

Hex edit the ROM, force the VRAM always running at the same clock even at the lowest power setting. After you alter the ROM, most likely the card will unable to go into the true low power state (about 15W), but stuck at the high idle (same as multiple monitor connected, about 55W). However, this will effectively stop the flickering.

In my own test, this flickering only occur during VRAM clock speed change. Strangely most PC 79xx or R9 280(x) not affected, but mainly the officially supported Sapphire 7950 Mac Edition suffer.

I tired quite a few work arounds, including lower the VRAM clock etc, none of them can really fix the issue, but just alleviate up to certain level (e.g. less then 1 flickering per day). The only permanent fix so far is to force the VRAM always run at same speed. 1000MHz, 1250MHz, 1500Mhz... doesn't really matter, but must stay constant. If you don't mind to lower the performance a bit, 1000MHz is a pretty good number. It lower the idle power draw a bit, but generally won't affect the performance too much (most job are not that VRAM speed sensitive).

And if you running dual monitor, it will automatically prevent the card go to trie idle as well, which should also fix the issue.

However, all the above only works if the reason of the flickering on your XFX cards are the same as the Sapphire 7950 Mac Edition card.
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