Rich
Hey, just thought I'd put my 2 cents in here, so don't quote me on this or anything, but I think that in general, yes, you can mix the two speeds. It used to be that with the older computers (the ones that used PC 66, 100, and 133) you couldn't mix the speeds. But with the newer computers out today, I think that it "is" possible, but personally I wouldn't recommend it. Just my two cents worth. If you can afford it, I'd buy some more pc2700 memory modules instead of mixing the 2100 and 2700 together
Take care.
