The .02 comes from the bus clock not being exactly 200MHz, but nearer 201MHz, this is nothing to worry about and it is the motherboard doing it. Most are not exactly 200.
This exposes an alternative method of overclocking, changing the bus frequency rather than or together with the multiplier.
For example 20x 200 MHz = 4GHz or 4000MHz.
also 16x 250MHz = 4GHz or 4000MHz
Both give the same results but maybe with different voltages required.
My best overclock for the bus was on an ASUS M5A99X evo which could get >300MHz so I was using 16x 302MHz = 4.832GHz, 4832MHz.
My Crosshair Formula V does not like a bus clock this high and the best i got was just over 260MHz.
To alter the bus clock you must fix the PCIe bus at 100MHz and you must lower the memory multiplier to avoid causing the memory to fail.
Anyway to OC your CPU, from experience I would fix the CPU voltage at 1.425V - 1.45V max. Your manual is not explicit on the advanced voltage settings, but you should monitor the actual voltages under load after each change to frequency. Turn off the turbo function. Start by increasing the multiplier in 0.5x steps.
This voltage should easily get you to 4.5MHz (22.5x 200) as previously explained. If not, back off a bit or raise the volts a notch and try again . I would stay below 1.45V for day to day usage.
By not changing the bus clock, no changes are made to memory settings, other buses like PCIe so all that can be left as stock.
Continue monitoring temperatures and use ASUS realbench for stability tests and whatever games, programs you normally use. Some encoding benchmarks are useful for checking stability. Avoid Prime for high overclocks, it just gets too hot in multicore processes.
Good luck.