Another update.

Had another chance to look at this and as a last resort moved the x1900xtx to the x8 PCIe slot and guess what it works!

When I got the machine I thought it was weird that the GeForce was in the x8 slot but I still managed to use the x16 slot with the x1300pro. So not sure if the x16 slot is potentially damaged.

I’ve now got the x1900xtx in slot 3 (x8 speed) and my network card in slot 2 (x4 speed).

Haven’t had a chance to play around with it yet but from two minute test the issues I was having with tinygl have been removed.

Only weird but is that it’s only showing as having 256m of memory rather than the full 512m.

I’ll have more of a play around over the weekend now and see how I get on.

[ Edited by Zetec-s 14.11.2020 - 15:46 ]

Another update.

Had another chance to look at this and as a last resort moved the x1900xtx to the x8 PCIe slot and guess what it works!

When I got the machine I thought it was weird that the GeForce was in the x8 slot but I still managed to use the x16 slot with the x1300pro. So not sure if the x16 slot is potentially damaged.

I’ve now got the x1900xtx in slot 3 (x8 speed) and my network card in slot 2 (x4 speed).

Haven’t had a chance to play around with it yet but from two minute test the issues I was having with tinygl have been removed.

I’ll have more of a play around over the weekend now and see how I get on.

> Only weird but is that it’s only showing as having 256m
> of memory rather than the full 512m.

256 MiB VRAM is the maximum MorphOS can use.

I don't understand. Does this mean i can use a random supported gfx card for MorphOS in any higher, slower slot and keep the MacOS card in the fastest slot and this setup will run on both systems, assuming the Mac side will ignore the PC card in the slower slot?

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I thought that might be the case.

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Don't know if this is related but I used to have an RX560 which is x8 and it wouldn't work in the x16 slot in my 7700k machine. Recently upgraded to an RX590 which is x16 and that does work in the x16 slot.

I thought the slots were supposed to be backwards compatible but it appears not.

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In my G5 11,2 I have the GeForce 6600LE seated in the lowest (x16 ?) slot and the Radeon X1600 Pro two slots above (x8 ?) whichs works fine for MorphOS and Linux. Don't know about OS X as I don't use it.

Don't know if this config would work equally well if I swap the GeForce and the Radeon, never tested.

I guess MorphOS will skip the Nvidia at all times, but would it skip using an ATI Radeon in the prefered slot just because it is an unsupported one and search for a known one?

Why the hell did this post get marked as edited just because i fixed a typo within a minute or so?

Guys, if you have X1950XT you can always reflash it to Mac OF firmware and use it in MacosX and MorphOS and OF.

I've got a 1900XT which appears to have a 1900GT PPC ROM. This works fine with OSX 10.4 and 10.5 with supplied drivers.

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=12716&post_id=143703&viewmode=flat&sortorder=0&showonepost=1

[ Edited by amifrog 14.11.2020 - 20:29 ]

> would it skip using an ATI Radeon in the prefered slot just because
> it is an unsupported one and search for a known one?

At least on the X5000 that's unfortunately not what MorphOS does with unsupported AMD Radeon cards.

> Why the hell did this post get marked as edited
> just because i fixed a typo within a minute or so?

Because you didn't untick "Add edited by..".

> if you have X1950XT you can always reflash it to Mac OF
> firmware and use it in MacosX and MorphOS and OF.

Am I right in assuming that this should work with all X19xx cards?

Just identified another issue.

Computer boots fine and Morphos finds the graphics card (the x1900xtx) and also brings up a 1920 x 1080 24 bit display on boot.

However, when I do a soft reboot Morphos can’t find the monitor and instead boots an 8 bit 640 x 480 display. Then even a computer shutdown and turn back on doesn’t resolve this until I shut it down and then leave for a small period of time. After which it boots fine again.

I can go into Monitor preferences and reset the monitor settings each time but is there a way to avoid this? Is it possible to manually set the monitor rather than wait for Morphos to auto detect?

> Is it possible to manually set the monitor rather than wait for Morphos to auto detect?

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=12874&forum=9

Is this what you're looking for?

I moved my Quad G5 from one room it was stored in, to another room, and reading this thread is making me want to get it set up, so I can use it and experience the extra performance, compared to my 17" 1.67GHz G4 PowerBook, which is the only other MorphOS system of mine that I can get to at this point in time. I have forgotten which video card the previous owner put in it, but I think it is one of the Radeon x1900 varieties, so near the top of the list of best performing supported video cards for MorphOS. I also think that he installed a networking card, and maybe even additional USB ports on a PCIe card? (Nope, just looked and no USB card, but it does have two video cards, both with dual DVI ports, so I think one of them is an NVidia card).

So an Nvidia card becomes a requirement to boot when using a PC display card for MorphOS or is this just to display firmware prompts when booting?

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Perfect.

Thank you for pointing me in the right direction.

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It is just necessary to do the first install of Morphos as I believe the Mac won’t initially boot with only a non Mac card in it.

I’ve taken my nVidia out (as I’m all installed on Morphos) and mine boots fine into Morphos without it with only a PC graphics card in now.

> It is just necessary to do the first install of Morphos as I believe
> the Mac won’t initially boot with only a non Mac card in it.

Do you mean the Nvidia card enables the manual adjustment of the OpenFirmware settings to have MorphOS booted automatically? Or something else?

Once installed MorphOS you can remove nvidia card.

Actually on my setup (g5 quad core) I have swapped an ati x1900gt (pc bios) into the first 16x pcie slot and moved nvidia 6600 two step upper into 8x pcie slot.
I have also two pcie ( one wifi atheros and one realtek lan cards) interleaved in remaining two slots.
All runs very well under osx/linux and morphos

But what if i need the more performant gfx card in the fastest slot, for MacOsX apps supporting multiple cores and Core Image etc. but this card is not compatible with MorphOS?
Will it work (MOS) with a comp. card in one of the x8 slots and ignore the unusable Radeon in the x16 slot?

I am asking this because i have to buy another card to get MOS working while the Mac side stays as it is.

I also don't really understand why it is so difficult to put a generic picture on the screen when the gfx card family is supported but the specific device is not. Isn't there a SVGA kindof signal all cards can do?

[ Edited by amifrog 15.11.2020 - 21:41 ]

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When you write "Will it work", I'm guessing that you mean "Will MacOSX work" and the answer should be yes, MacOSX will find the video card that it supports, no matter what PCIe slot it is placed in, and should ignore the Radeon video card with the PC bios. I can't confirm this is what happens (yet), but this is what I think happens from what I have read here and on other forums. I assume that if your "more performant gfx card" is capable of using the full bandwidth of a 16x PCIe slot, but you put it into a 8x slot, it should be backward compatible and just work at a lower performance, but there is some question about this opinion in different threads. Maybe some 16x video cards will not work at all when placed into an 8x slot?

No, will it work refers to MOS. MacOsX works always, obviously, provided with any Mac gfx card.

All Mac,Linux,mos os seems to work nicely in any combination of gfx cards.
At least for me.

@Flash: Good to hear!

So it seems the X1900 XT is better left with PC-BIOS when you also want to run Linux? I had my X1900 XT Mac-flashed which was fine for MorphOS and OS X but in Linux the card was unbearably loud. Fan control didn't seem to work there. Sold it and was back again with my GF6600LE + X1600Pro combo which I am now (mosrly) happy with.