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#1
August 19th, 2005, 10:46 AM
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| 8x AGP graphics cards not backwards compatible?
I wondered... all the new cards from ATI state as requirement "Power Mac G5" (the X800 for exmple), but I wondered why? Isn't AGP basically backwards compatible so that an AGP 8x card can work in an AGP 4x slot?
__________________ PowerMac G4 MDD '03 1.25GHz, 1 GB RAM, 2x80 GB HDD, on OS X 10.4.x/10.5.x iPod nano 2nd Gen 2GB  Part of the party since MacOS 7 My Last.fm Profile  |
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#2
August 19th, 2005, 11:52 AM
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Most AGP 8x cards will work down to 4x, but they run at a voltage of 1.5. If the previous systems used AGP cards at a voltage of 3v, they won't work. You can actually do damage to the card and/or motherboard if you do this. I mistakenly installed an older AGP card to a PC motherboard that supported AGP 8x. Thankfully nothiing bad happened. The motherboard suported the 1.5v AGP and the card was a 3v AGP card.
__________________ • Apple iMac G5 17" (2 GHz G5) - Mac OS X 10.4.11/Ubuntu 9.10 • Asus Eee PC 901 (1.6 GHz Atom N270) - Ubuntu Netbook Remix 9.04 • Apple Macintosh Quadra 650 (33 MHz MC68040) - Mac OS 8.1 • "JHVH-1" (2 GHz AMD Athlon XP 2400+) - Slackware 13 • "Kidbuntu" (2.8 GHz Celeron D 335) - Ubuntu 9.04 |
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#3
August 19th, 2005, 01:29 PM
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Ah, so if I get this right: For example the ATI Radeon X850 is labeled G5 only, as my mainboard in the G4 MDD is not cabable of delivering the right voltage to the card?
__________________ PowerMac G4 MDD '03 1.25GHz, 1 GB RAM, 2x80 GB HDD, on OS X 10.4.x/10.5.x iPod nano 2nd Gen 2GB Part of the party since MacOS 7 My Last.fm Profile |
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#4
August 19th, 2005, 01:34 PM
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Correct.
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#5
August 19th, 2005, 02:36 PM
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Ah, ok. Thanks for clearing that up 
__________________ PowerMac G4 MDD '03 1.25GHz, 1 GB RAM, 2x80 GB HDD, on OS X 10.4.x/10.5.x iPod nano 2nd Gen 2GB Part of the party since MacOS 7 My Last.fm Profile |
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