CGA & clock speeds

Hello, I hope this mail goes to the right place as I'm not on the list; here goes: I am messing about with an 8088-based clone to see what I can do with it for cheap thrills & a good learning experience. So far, I have installed a V20 chip which decreased processing time by about 7%. I then tried to clock it at 10 MHz (the rating of the chip), but this failed to produce any results (the 'puter did not boot.) I tried at 8MHz, and the computer booted but did not give a display. I could tell it was working by entering DOS commands. I tried then at 5.33 MHz. It booted & ran OK (as far as I could tell), but the display was all messed up. I then did some research and found that the CGA card depends on the 14.31818 oscilator to run properly. Since the processor seemed to be running OK at 8 MHz, what I want to do is find a way to send a proper clock signal to the CGA card while clocking the main board at 8MHz. Or will changing to a different monitor (like VGA) make the clock speed irrelevant? Is CGA the only clock-dependant display type? Thanks in advance, Dave