Upgraded to 1.25 Gigs RAM from 512 MB-- notice some HEAT

Hi folks. I just upgraded my 12" G4 PowerBook (1.33 GHz) from 512 MB to 1.25 GB of RAM by adding a 1 Gig card. The first card I bought was a 3rd party brand and it was faulty, but the company was good and sent out a replacement.. the Samsung (same as used by Apple) arrived quickly.
My question is this: Does it make any sense that I would notice a bit more heat production with the 1 Gig card in there? It's possible that it's only happening because I'm using Lightroom, more of a memory hog than other programs I've used previously. Or maybe it always gets warm like this but I don't always notice it as much when I haven't changed anything.
Wanting to run Lightroom was initially the main reason I wanted more RAM, BTW.
Thanks for your input.
PowerBook G4   Mac OS X (10.3.6)   1.33 GHz, 1.25 GB RAM

Welcome to Apple Discussions!
Some heat may be possible just because the components are more dense. I would note the following:
1. Heat of laptops is normal to a point:
http://docs.info.apple.com/article.html?artnum=30612
2. You can use the hardware test disk that came with your machine to run an extended test and see if it detects anything wrong. Does not mean the RAM is good or bad if it detects nothing. But if it does detect something wrong, then it is.
3. I've seen Blue and White G3 RAM go bad, and overheat so that it is too hot to touch. So any RAM can go bad at anytime, and even high quality RAM can too. Try replacing the RAM if you are seeing behavior with the machine that would not be considered normal under an erase and install (backup your data first), and it seems to happen when the heat gets more. Make sure when you get RAM, it is too spec:
http://www.info.apple.com/support/applespec.html
And lifetime warranty RAM at that straight from the manufacturer.
4. The 15" Powerbooks of the 1.25 Ghz generation have been known to have issues with one RAM slot. I know Apple started servicing newer 15" models due to RAM issues:
http://www.info.apple.com/kbnum/n303173
Not sure if the same issue has been seen on the 1.33 Ghz 12".
Good luck!

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