Overclock Cumine and fuzzy SCSI errors



Hi... I overclocked my CPU Coppermine 500 at 667 Mhz setting the Bus at 133 Mhz (Mobo Abit Va6). But my system is unstable, and my CD Plextor Ultraplex 40x as well as my CDR Teac R55S make some strange and random read/write errors. This goes away setting back the Bus at 100 Mhz. Could it be my SCSI Controller, which is rather old (Symbios Logic 8100S, 53810 periferal) giving those troubles to me? And, if I have to change it, which one should I choose (not too much expensive thanks!)? Bye