The 2200 means that the system performs roughly the same as a Pentium at 2.2 Ghz. The AMD has a lower speed, but in each cycle it "does more work". Therefore it performs like the 2.2Ghz Pentium, but has a lower clock speed.
You should increase the fequency to 200MHz. Your current multiplier is 9 so 9 * 100 = 900MHz and 9 * 200 = 1800Mhz. Before you change anything, what is your RAM speed? DDR333 or DDR400?