What is CPU External Frequency???

[ladic]

On my bios mine reads 166mhz?
what exactly is this??


Also, what is the Graphics Aperture Size? on my pc is at 128mb.

thanks for any info.

 

[Phanboy]

The core clock domain is entirely self-contained in the CPU, and not visible on any pads. The various bus clocks (PCI, FSB, ISA, etc.) are "external" in that they are made visible via pins, and are routed among the elements on your mainboard.

The 166MHz here refers to your FSB clock (BCLK), and is more meaningfully measured as 667 MT/s. The Dothan-based (Pentium M) ThinkPad I write this from has a bus speed of 133 MHz or 534 MT/s

 

[ladic]

my mobo says it is supposed to have up to 200mhz fsb.

so why isnt my pc at 200mhz instead of 166?

 

[Phanboy]

Graphics aperture size is tricky:

Your computer addresses (talks-to) your PCI and AGP devices by mapping them into its regular address space. The graphics aperture relocation table is a chunk of this PCI space that maps directly to your RAM (but is usually fragmented). In this PCI address space, it is all contiguous.

The aperture space is used by your AGP card to store textures, etc. to main memory. It isn't very important if you have an AGP card with a large amount of RAM.

The PCI address space is usually mapped by BIOS to the upper gigabyte of the address space. For a 32-bit operating system, this is one of the reasons that you can't address 2^32 bytes of RAM (4 GB).

 

[Phanboy]

my mobo says it is supposed to have up to 200mhz fsb.

so why isnt my pc at 200mhz instead of 166?

What motherboard and CPU do you have? Some generations of CPUs limit bus speed either due to circuit marginality issues, or are lower-cost variants.

 

[ladic]

my mobo says it is supposed to have up to 200mhz fsb.

so why isnt my pc at 200mhz instead of 166?

What motherboard and CPU do you have? Some generations of CPUs limit bus speed either due to circuit marginality issues, or are lower-cost variants.

my cpu is AMD XP 2500+ Barton

my mobo is ASUS A7NX8-E

 

[Phanboy]

my mobo says it is supposed to have up to 200mhz fsb.

so why isnt my pc at 200mhz instead of 166?

What motherboard and CPU do you have? Some generations of CPUs limit bus speed either due to circuit marginality issues, or are lower-cost variants.

my cpu is AMD XP 2500+ Barton

my mobo is ASUS A7NX8-E

Ladic,

I found this link for you
http://www.cpu-world.com/CPUs/K7/AMD-Athlon%20XP%202500+%20-%20AXDA2500DKV4D.html

It confirms that your mobo is working correctly; the bus clock of your CPU is 166MHz. Your mobo supports 200MHz, like you say, but you can only use this frequency for a part that supports it.

 

[ladic]

ah many thanks for the clear up.

one more thing.

when I go those settngs on the mobo it can be manually set to 200, but the comp wont work and i have to set it back to 166 in order to work.

so in essence, i will never be able to set it a 200 in the bios right?