No you've misread it completetly what it say is if you've got PC2100 memory the maximum it will take is 3 gigabytes and so on. Your board will only support 1 gigabyte of DDR400. According to the info you have given you can have 1 gig of any of these memory types but if you choose the DDR400 then the MAXIMUM you can have of this particular memory is 1 gig.
The type of memory you use depends on the speed of your processor, if you use slower memory then your computer may run, but it wouldn't run at full speed. What you need to know is what speed of memory is suitable for the processor you have. I can't help you there I'm afraid as I've used AMD processors for some time now and know very little about Intel chips. I'm sure some of the Forum will advise you though.
PSF unless I'm misreading it you can only put up to 1 gig of DDR 400 in this board, a maximum of 1 gig. I downloaded the manual and checked and this confirmed it. The board will take 3 gig of memory but only 3 gig of PC2100, it would also take 2 gig of PC2700 or 1 gig of PC3200(ddr400).