Most likely the answer is: Yes. It, probably, won't run at the 3200 speed, however. Generally speaking it is backward compatible. I would check it out at http://www.crucial.com just to be safe. Good luck.
No. DDR RAM cannot be used to replace or upgrade a PC133 module.
No, pc133 is SD ram and Pc3200 is DDR ram. They are not compatible with each other.
ddr266/pc2100 and ddr333/pc2700 are interchangeable.
no you can not use 400 MHZ ram because (PC2100 @ 266 MHZ ddr) and (PC2700 @ 333 MHZ ddr) are the only chips that are inter changable. PC3200 is 400 MHZ but it has 2 slots not just the one. It does not fit into the same type slot as either PC2700 or PC2100. I was looking at the possibility of a PC2700 ram rated at 400 MHZ but I do not think there is such a thing.
You wouldn't notice the difference if you are just doing casual computer use, for example: Internet Browsing, listening to music, or word processing. However, if you are playing graphically intensive games, then you would notice a difference. The higher the PC number (PC2100, PC2700, or PC3200) then the better it is. Just be sure to buy the memory that is compatible with your motherboard... that is if you are planning on buying memory.
DDR
It is possible to use pc3200 ddr ram in a PC designed for pc2700 ddr ram, but the pc3200 ram will only run at pc2700. If you want to fully exploit the pc3200 ram then you will have to buy a motherboard that will be able to support a speed equal to pc3200 or greater.
PC3200 Ram can be purchased from many stores and online retailers. One can buy it from Best Buy, eBay, Amazon and TigerDirect. It costs between $15 and $30.
PC3200 is a kind of memory for computers. It is compatible with a computer if the BUS speed of the RAM module is 400MHZ or megahertz. The memory chip will have PC3200 written on it for easy identification.
PC6400
PC-3200
Processor Type is not important when selecting memory. It's the FSB (Front Side Bus) speed that's important... FSB400 PC3200 FSB333 PC2700 FSB266 PC2100 If you have a processor with a 400MHz FSB, then you need a Motherboard which supports a 400MHz FSB. You then select the appropriate memory.