What is the max ram for a iMac DV 400mhz? (family M5521)

I've read several posts on this forum about the max memory for this iMac. Several people say it's 512 then usually someone comes back and says "Actually it's 1024". As per the Apple specs page (posted below) the Min is 64MB and the Max is 512MB. Is that overall system, or per slot? I'm guessing it's per slot, since it has two slots and the Ram Sizes states it can handle a 512 chip (2 slots @ 512 ea. = 1024) am I wrong in this?
Thanks,
-Matt
RAM Slots: 2, PC100 DIMM
Min - Max RAM: 64 MB - 512 MB
Min RAM Speed:
RAM Sizes: 64, 128, 256, 512 MB
iMac DV 400Mhz 512Mb   Mac OS X (10.3.9)  

First ensure that you have the correct firmware installed. See Announcement: iMac (Slot Loading): Install iMac Firmware 4.1.9 Before Mac OS X 10.2 or later.
You will need OS 9 installed on the hard drive to install that firmware update. If OS 9 is currently on the hard drive you can install the firmware update (if needed) before swapping the hard drive.
Yes you can install OS 10.3 directly without installing OS 9. If there is any possibility that you will want to boot from OS 9 in the future, ensure that you pick the option to install the OS 9 disk drivers.

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