Hi-Density memory

I have the opportunity to buy a stick of 512 Mb HI DENSITY (64x4) PC-133 SDRAM for my Asus A7V133 mobo.
Anyone has used that kind of memory? Will my board recognize it?

High density memory is known to only work with certain Athlon motherboards and doesn't work with any Intel boards as far as I know.

Better make for certain it will be compatible with the chipset on your motherboard before buying it. Asus' website should tell you or the website of the manufacturer for the memory should have a list of compatible chipsets.