I have a Dell Optiplex 755 that I have successfully gotten Leopard to install on (XxX version) with two lingering issues. Sound doesn't work yet, but I haven't spent much time figuring it out, but the big one is video support.

Looking around I can't find any Kext's for a Radeon 4550. Does such an animal exist? If so, could someone provide a pointer for me?

Thanks

No, there are none, unfortunately,

Supported cards include: ATI 2400,2600, 3650, 3850, 3870, 4850, 4870 but not 4550, 4650 or 4750 yet!

Guess I need to find another low profile card then.

Just wondering where the support for the 4850 is? Because as far as I know there are no drivers for the 4850 at present.

hey guys, just wondering if there are any updates on kexts for the 4550, I just bought two of these cards and it's basically the only thing preventing me from giving snow leopard a go right now

It's possible to run Snow Leopard/Leopard on the 4550 in full resolution in VESA mode, I do right now until I get my 4870x2 delivered.

Just remove all ATI Radeon kexts from your system and boot with "Graphics Mode"="1600x1200x32" (or whatever your resolution is) and you're up and running.

Not a great solution though obviously since you have no 2d/3d acceleration what soever.

Yea does anyone have the kexts required for this graphics card?

As far as Snow is concerned:

Ati 4550 should work after a bit of hacking. Source: http://netkas.org/?p=284




But i want to know guys if there is a way to install Aitkos or iDeneb and get this card working?  

ANything new guys? I'm really hoping someone has found a kext for this card. I don't really want to buy another one, just so I can have dual monitors on 10.5.6.. Any help is appreciated..
-I long for a 4550 kext!

Try the kexts you can find here:

http://www.insanelymac.com/forum/index.php?showtopic=190586

Those drivers are (only ones) working for my 4550!

How did you manage to get it work?