How do I upgrade my 800MHz PowerPC G4 eMac?

What RAM modules do I use? I found a few different kinds and am not sure of the difference.
Kingston 512MB PC2700 333MHz DDR SDRAM Memory Module KTA-G4333/512
Kingston 512MB PC133 SDRAM DIMM Memory Upgrade KTA-G4133/512
Lifetime 512MB SDRAM Memory Module 10274-512
Also, is there any way of upgrading the processor? I saw something online about someone who upgraded their 800MHz to a 1.33GHz. Is this realistic?
Is there anything else I can upgrade? I work with lots of hi-resolution RAW files and multiple applications at once and need to speed up my work. I also want videos on the net to work better and less choppy.
Here are the details of my computer:
Machine Name: eMac
Machine Model: PowerMac4,4
CPU Type: PowerPC G4 (2.1)
Number Of CPUs: 1
CPU Speed: 800 MHz
L2 Cache (per CPU): 256 KB
Memory: 512 MB
Bus Speed: 100 MHz
Boot ROM Version: 4.4.9f1

Welcome to Discussions, inspirenyc,
Your machine has two RAM slots, of which each can hold 512Mb of RAM, so the maximum amount in total would be 1024Mb combined.
You have likely 2 X 128 modules installed. Originally they came with 128 Mb so maybe you or someone added another 128Mb along the way.
The type of RAM for your eMac is PC100/133 SDRAM 168 pin 512Mb. which is relatively inexpensive now. The second one you mentioned would be suitable.
However, eMacs are not very upgradable. You can increase the RAM or put in a larger Hard Drive or upgrade the CD drive to a superdrive, but the processor cannot be replaced. Your reference to seeing online someone changing their processor from 800Mhz to 1.33Ghz was not from changing the processor. It was from altering the circuit board with a soldering iron! No job for the feint hearted. This kind of unconventional 'rewiring' could lead to destroying the eMac altogether.
If you are handling a lot of large RAW files you may benefit from a larger Hard Drive as a lot of that data is swapped out to disk. Replacing a Hard Drive is a bit involved but with care and patience it can be done.

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