Putting together an old skool system

Hey, I'm putting this system together and was wondering if anyone could give me a hand with some issues im having?

First up here are the system specs so far,

Celeron 733mhz
Gigabyte 6VXC7-4x
128meg SDram pc133
nvidia vanta

First thing im having trouble with is the ram im trying to put in to boost it up to a total of 256. I have 2 sticks of pc133 ram each 64meg in size, however when i put them in(mobo has 3dimm slots) the comp doesn't register them at all. Does this mobo take special ram or something? I don't really know much about this which is why im asking here.

Second question I have is that which vid card is better? An '8meg AGP nvidia vanta' or a '16meg Voodoo3 2000 PCI'? The Vanta is in there at the moment but i have a voodoo3 lying around.

Thirdly, is there anyway to unlock the multiplier on the CPU? The bloody thing only runs on a 66hmz bus speed where as the ram is capable of 133mhz. If I can't unlock it then my next best option is to set the FSB to 75mhz=824cpu clock or 85mhz=935cpu clock.

Any help would be appreciated, thanks.

BTW, if anyone wants to know why im bothering to put a system like this together then it's for the simple reason that someone gave it to me. I thought i may as well chuck in some parts i have lying around and fire up some old games on it :). I'm also interested in o/c it for some fun, i hear the celerons were good o/cer's.

Celeron A's are good OCers... not sure what old school non A celerons are like though
I would say the 16mb Voodoo would be better cos its 16mb :P
With the Ram, are you sure it takes pc133? maybe you need pc100?

Well i thought the vanta mighta been faster cause of it being based on the TNT2. Plus it can do 32bit color in games lol.

Anyway i have to use the vanta cause the voodoo3 was causing system instability. I dont think this mobo likes having a PCI vid card.

Strange thing with the ram is that i put it in and the comp boots up fine but it just doesnt register or see the ram i put in. The mobo definatly can have pc133 ram as the stick that works is pc133. Theres a ECC 72bit integrity mode or something...i can disable it altho does this mean it needs ECC registered ram or something?

Celerons can only be FSBed overclocked. I remember the day of thinking my 366@550 was screaming