On the older, original, G4 towers the ram was centered in the case, and at the top so it goes above the top bay. And on the Graphites I could have sworn they were in the same position, whereas the newer cheese grater G4's had their RAM placed beside the heatsink. If you could send a pic of what your talking about Tutan, I'd appreciate it, but having a hard time visualizing it, since the RAM would hit the original optical drive if it were that low.
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MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop