htrieu

thanks for the reply Andre. I fixed the issue by disabling the JMicron PATA controller in BIOS.

Hi Andre, I followed your procedure to determine the cause of the high CPU usage. It seems that ataport.sys is the culprit, averaging 30.68% CPU usage over the interval I highlighted. USBPORT.sys accounts for 4.64% of the CPU usage. I am running an Asus P5E Deluxe motherboard with an Intel Core 2 Duo E8400. I downloaded the latest drivers from Asus for my P5E, but no luck. My hard drive is a Western Digital 1TB Caviar Black. Some people found NCQ to cause the issue, but my NCQ is turned off and so is AHCI. A screenshot of my Interrupt CPU Usage Summary Table is attached. Any help would be appreciated. Thanks in advance.