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B&W won't take 512 RAM sticks... it maxes out at 1GB, i.e. 4x256MB
http://dealnews.com/memory/prices/PC100-SDRAM/15/256MB.html

PC-100:

32 MB
64 MB (I believe B&W G3s shipped with one of these installed)
128 MB
256 MB *low-density* (chips on both sides of the stick)

PC-133:

64 MB
128 MB
256 MB *low-density* (Again, chips on both sides of the stick. But I've never seen a stick that matches this particular description.)

B&W G3 *will not* support the following RAM:

256 MB *high-density* (chips on only one side of the stick) in either PC-100 or PC-133
512 MB in any configuration

One of three things will happen with unsupported sticks: (1) the machine will not boot up, possibly beeping or flashing the "bad RAM" code in the power LED; (2) the machine will boot up, but will not see the unsupported stick at all; or (3) the machine will boot up, but will see only half of the unsupported stick. In any case, you've wasted your money.

You can mix and match sizes and speeds, no matched pairs necessary, for up to a total 1GB. PC-133s will "clock down" to PC-100.

I love my B&W G3. Great machine, very versatile. I wish you luck finding RAM.

Peace,
CW