Lower and Upper Ram slots?

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Lower and Upper Ram slots?

What's the difference and can you use two ram chips together?

I recently upgraded my 15" Powerbook G$ ram from 256 to 512 and I noticed the two slots.

protocol6v's picture
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No difference. Just more upgr

No difference. Just more upgradability. I currently have a 1GB and a 512MB in my MacBook Pro and had the same with my 1.67GHz PowerBook G4 before i sold it to get this.

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OK so I can reinstall my 256 Ram card?

Which card should go into the lower or upper slots? Does it matter?

So am I going to get 256+ 512 MB of RAM then? 768 MB?

I also read that G4 aluminum powerbooks had problems with the lower ram slots. Should I risk installing my old RAM card into one of the slots?

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Of course you should

The upper and lower ram slots work the same.

Be bold, dare! Jam the Ram in! GO GO GO!

More ram is better! OS X loves RAM!

All kidding aside, there is so much info on the web, and on apple's website, you should go there and check it out.

Heres some: http://docs.info.apple.com/article.html?artnum=95132

protocol6v's picture
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Apple has a repair extension

Apple has a repair extension program for the powerbook g4 15" ram slots IIRC.

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Look here for instructions

Fix It Guides for Mac Laptops & Mini
http://www.ifixit.com/Guide/

The guides can be viewed on-line or you can download a PDF file.

Cheers, Tom
Mac Troubleshooting, Maintenance & Tips
http://www.geocities.com/texas_macman/MacTroubleshoot.html

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Repair extension

The PowerBook G4 15" memory slot repair extension (at present) only includes the 1.5/1.67 ghz revision of the PB G4 15". As far as the issue is concerned, I haven't found that any user action causes it. So using both slots should not create any issues.

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