不是喔
請看：
http://www.rojakpot.com/Speed_Demon...S_Guide_02h.htm

======= 這是引自上面的網頁 ============
PCI Latency Timer
Options : 0 - 255

This feature controls how long each PCI device can hold the bus before another takes over. The larger the value, the longer the PCI device can retain control of the bus. As each access to the bus comes with an initial delay before any transaction can be made, low values for the PCI Latency Timer will reduce the effective PCI bandwidth while higher values improve it.

On the other hand, while increasing the value lets each PCI device access the bus longer, the response time of those PCI devices suffers as a result. That means every PCI device will have to wait longer before they can get access to the bus but when they do get access, they can conduct their transactions for a longer time.

Normally, the PCI Latency Timer is set to 32 cycles. For better PCI performance, a larger value should be used. Try increasing it to 64 cycles or even 128 cycles. Some PCI devices may not agree with longer latency times so if you start facing problems like stuttering sound or a less responsive system, reduce the latency. Higher values will actually reduce performance as too much time may be allocated to each PCI device to the disadvantage of other devices on the bus.