[tju85]

2 Years ago, when I bought my iMac G5 with the I-Sight, I upgraded the Ram to 1GB. I beileve I put another 512MB ram in the second slot.

After installing Logic Studio, I could tell I needed to install more ram.

If I installed a 2GB ram in the second slot, I would be up to 2.5GB RAm, correct?

Would this harm my computer in any way because I've read if the Ram in the 2 slots dont match, that it could cause problems. Obviously, a 512MB and 2GB RAM won't match.

Basically, can I buy the 2GB ram off a cheaper website, like this one.

Apple iMac G5 2.1GHz 20 Memory Upgrade, Samsung Memory for Apple iMac G5 2.1GHz 20

[Sherman Homan]

Ram specs can be very complicated. Chasing the absolute cheapest price will pretty much guarantee that you will end up with something that won't work. Buy from a real company, the aggravation and shipping costs will offset the money you save. Some Mac models support interleaving which can give a good speed increase and for that to work you need matched pairs. But I thought the iSight iMac only had one ram slot.

[Veltliner]

Go to crucial.com.

That's excellent RAM, and at excellent prices. Their service is great.

I bought my RAM there - for the same iMac model you have, and then for my intel iMac.

[mduell]

You only have one slot; you also have 512MB soldered to the logic board.

I don't think I'd buy from that site you linked to, given how many of the specs they have laughably wrong.

Crucial is always good, if a tad expensive ($37 for 1GB or $143 for 2GB).
Newegg has 1GB for $30 or 2GB for $117 that should be compatible, but are not guaranteed to be so.