From the amd761 chipset spec sheet:
<< Figure 4 on page 12 shows the AMD-761 system connection to unbuffered DIMMS. Unbuffered DIMM Support requires only four chip selects to support a maximum of two DIMMs. Only two unbuffered DIMMs are supported due to the heavy loading of the DDR signals by unbuffered DIMMs. The AMD-761 system controller provides six differerential clock pairs, three for each unbuffered DIMM. >>
And, yes it is somewhat of a bum deal as I am sitting here holding 1GB of non-pariety pc2100 that I bought when Crucial first put it on sale. Now, I might have to sell it at a discount to run full guns on the kg7 when it arrives...but what has been straightforward about any ddr mb that has arrived since the 1st of this year? Besides being the beta testers, we are the bastard stepchildren of the mb manufacturers...