Oops, I see, the 440 has DDR. I must have misread.
But 420 Should be slower than any of The GF3s. Considering all GF3's Have 128bit DDR, which should, effectively run twice the speed of SDR. IMO, If the chipset has improved greatly (which I doubt), It could possibly be able to keep up with a Ti200. Of course, I could be wrong.