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upgrade my iMac's video card?
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matt
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Join Date: Jun 2004
Location: Phoenixville, PA
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2005-05-11, 21:25

so i upgraded my 20" 1.8Ghz iMac G5 to Tiger last week, and I have noticed that I cannot view H264 HD video with out the video stuttering. My gut feeling is my 64MB video card is not cutting it. Then a couple days later the iMacs are updated with more RAM (i don't care, i have 1GB), but a better video card 9600 128MB.

1. Can I upgrade my iMac G5 with this new video card? I remember Apple saying iMac G5s are the first upgradeable consumer desktop.

2. If I can, will HD video flow smoothly?
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HOM
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Join Date: May 2004
Location: The Rostra
 
2005-05-11, 21:29

1) No. The graphics card is not upgradable in the iMac

*Cue spec whores whining about non-upgradable GPU*

2) No. Apple has not opened up the GPU to accelerate video especially not MPEG4 video. AFAIK Apple has not opened up the API to developers to allow offloading of MPEG2 to the GPU, which pretty much every GPU has supported for ages, nor do they implement it themselves. Apple' MPEG2 support is in software only.

CARTHAGO DELENDA EST

¡Viva La Revolucion!
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matt
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2005-05-11, 21:33

so then the HD video stutters on my iMac because it is only a 1.8 G5 with 1GB of RAM? that is hard to beleive, it has to be related to the GPU. why the hell would Apple release Quick7 with H264 support if most Macs cannot even take advantage??
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HOM
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Join Date: May 2004
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2005-05-11, 21:37

It depends on which of the HD videos you are trying to watch.

From Apple's Suggested Specs Page :

Quote:
For 1280x720 (720p) video at 24-30 frames per second:
1.8 GHz PowerMac G5 or faster Macintosh computer
At least 256 MB of RAM
64 MB or greater video card

For 1920x1080 (1080p) video at 24-30 frames per second:
Dual 2.0 GHz PowerMac G5 or faster Macintosh computer
At least 512 MB of RAM
128 MB or greater video card
If you're watching the 1080p videos it's going to stutter. If it's the 720p it should play ok.

EDIT:
Quote:
why the hell would Apple release Quick7 with H264 support if most Macs cannot even take advantage??
It's not the first time Apple has intro'ed a new Codec that requires top of the line systems to play. My computer isn't 'supported' by Pixlet and my system was still 'brand new' when Panther came out. One of the reasons that H.264 looks so good as relatively small file sizes is because it trades size for CPU requirements.

CARTHAGO DELENDA EST

¡Viva La Revolucion!

Last edited by HOM : 2005-05-11 at 21:43.
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matt
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2005-05-11, 21:39

HOM thanks for the info! but doesn't that prove that 128MB video card does help the H263 load? I understand CPU jumped from single 1.8 to dual 2.0...but the graphics card has to help?
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matt
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2005-05-11, 21:40

also, can the human eye really see the difference between 1080i and 1080p??? i never understood why people make a big deal about this? the refresh rate is so high you can't possibly see the difference? right?
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