its socket A so they won't be able to run in dual-channel anyways.
from the specs i've seen this comp has 1GB maximum... and it takes PC2700 memory (will also take pc3200.. it will just downclock.. so w/e is cheaper)
but it is a good idea to check out CPU-Z to match up the timings...
this one looks good
but again for best results its best to get ram that matches the timing of your current ram. open cpu-z, click on the "memory" tab, and tell us the numbers you see.. like frequency, cas latency, etc.. and get ram that matches up with that