Author Topic: Why is My PC Running Slowly?  (Read 1282 times)

J in Chicago

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Why is My PC Running Slowly?
« on: December 11, 2007, 09:17:39 AM »
[i:3oljzmmk]Q: I build my own computers and usually figure out things on my own, but my most recent PC is causing me some problems. I used an ASUS P5V800-MX motherboard: The front-side bus is supposed to run at 800 MHz, and the PC has a 3.2-GHz processor. The machine should be running a lot faster than it is. My BIOS tells me it is running at 800 MHz, but I have a utility program that I really like called Belarc Advisor, and it's telling me that the FSB is running at only 200 MHz, which would obviously slow things down.

I've racked my brains and tried to get answers from ASUS, but I am getting nowhere fast.—Tasman1067[/i:3oljzmmk]

A: This is a pretty common mistake to make; bus speed is an oddly confusing issue. Both the BIOS and your Advisor software are correct. Here's why:

When you see "800-MHz FSB" (front-side bus), what you're seeing is the effective FSB clock frequency. The FSB is actually running at 200 MHz. That is, there's a clock control in the chip that runs the FSB at 200 MHz.

Intel processors, like the one in your ASUS, can move four data items per clock cycle, however. This is commonly referred to as a "quad-pumped bus." To simplify labeling, this is often called an 800-MHz FSB. But it's really a 200-MHz FSB moving four data items each clock cycle.

Similarly, a 1,066-MHz FSB is really running at 266 MHz but is also quad-pumped.

From PCMagazine Thought it was a useful bit of information.
« Last Edit: December 31, 1969, 05:00:00 PM by J in Chicago »