probably the value is CAS3, where the non-value is CAS2. that would be my guess. i think VCRAM only works on some motherboards. I would just go with standard SDRAM, or some of that kingmax tinyBGA stuff. IT ROCKS FOR CHEAP but SHH dont tell anyone: on an ASUS CUSL2, i got 2 sticks of kingmax tinyBGA PC150 ram to do CAS2 at 143mhz. (p3-700 @ 143mhz = 1000mhz!)
my friend is going to be impressed with his new machine :] btw i bought the kingmax for $90 / 128megs on mwave.com