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I'm looking at 128MB and 256MB GeForce and Radeon cards for my PowerMac G4 and they are more expensive than my 1GB Radeon HD 5750. Like, really? I'm looking to pay $50-$60 tops for an old video card. Am I out of luck?
 
G

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Your best bet is the used market ... you won't find anything new in that price range new, they always jack up the prices when you're looking at things compatible older pieces of hardware.
 

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I'm looking at 128MB and 256MB GeForce and Radeon cards for my PowerMac G4 and they are more expensive than my 1GB Radeon HD 5750. Like, really? I'm looking to pay $50-$60 tops for an old video card. Am I out of luck?
Quick Google search popped up this NVidia-GeForce4-Titanium-TI4600-128MB
DVI/ADC-for-PowerMac-G4 for $128. at DV warehouse:

Video Card NVidia GeForce4 Titanium TI4600 128MB DVI/ADC for PowerMac G4

Where used:
Power Mac G4 (QuickSilver), Power Mac G4 (QuickSilver 2002),
Power Mac G4 (Mirrored Drive Doors), Power Mac G4 (FW 800),
Power Mac G4 (Mirrored Drive Door 2003)
Connectors/Video Out: DVI / ADC
Apple model #: 661-2595 M8757LL/A 603-2645 630-4470
 

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Quick Google search popped up this NVidia-GeForce4-Titanium-TI4600-128MB
DVI/ADC-for-PowerMac-G4 for $128. at DV warehouse:

Video Card NVidia GeForce4 Titanium TI4600 128MB DVI/ADC for PowerMac G4
That's a pretty good price for that card... I might buy one for my MDD.

The problem with 256Mb Mac AGP cards is that they're all made for the G5's AGP Pro slot. Unfortunately the power supply tab for the ADC port is in a different spot from the G4, and the actual G4 AGP slot is too short to accommodate the larger G5 cards so it won't physically fit (I just tried it to make sure). Your only option for 256Mb in an AGP G4 is a flashed PC card like this (and that price is about what you can expect to pay for it):

Apple Mac ATI Radeon 9800XT 256MB AGP Video Card G4/G5 - eBay (item 270666045075 end time Dec-18-10 12:07:24 PST)

...or a flashed PCI card in one of the other slots but they don't seem to be out there.

This is all assuming that your G4 is at least a Quicksilver, if it's older than that I doubt they'll even drive a 256 meg card (maybe the DA since it has a 4x AGP slot... maybe).

EDIT:

Also, for the flashed PC card you'll need to split power off from the drive bays since the G4 AGP slot won't have enough juice to drive the card and the fan on it (probably not a big deal).

EDIT #2:

I stand corrected by the web, there is a 9800 Pro 256Mb Mac edition that was rare and expensive that has the standard 4x AGP configuration, but they're still rare, still expensive, and still may not work with your machine. pm-r's advice below is very sound... you don't want to spend $300 on a card you can't use or return.
 

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And then check out the actual G4's power supply capabilities.

I had the ATI Radeon 9800 256MB AGP card in my G4 1.25 2003 SP dual boot that came with a y-splitter for the extra power needed and luckily my G4 MDD had the larger power supply that could support the extra load. Power Macintosh G4 1.25 (MDD 2003) Specs (Mirrored Drive Doors 2003, M9145LL/A, PowerMac3,6, M8570, 1914C) @ EveryMac.com

One needs to do a lot of checking for proper compatibility and OS support it seems - just like I and others had to do.

I repeat - One needs to do a lot of checking, otherwise any $$$ spent on any video upgrade can be blown away and lost with the wind - or even in a light breeze!!!
 
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