# clk\_sw - majorly confused!

**URL:** <https://forum.kirupa.com/t/clk-sw-majorly-confused/131096>\
**Category:** Uncategorized\
**Created:** [December 11, 2004, 10:42pm UTC](https://forum.kirupa.com/t/clk-sw-majorly-confused/131096 "2004-12-11T22:42:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![chrisbees1](https://avatars.discourse-cdn.com/v4/letter/c/a3d4f5/32.png) [@chrisbees1](https://forum.kirupa.com/u/chrisbees1)\
**Post date:** [December 11, 2004, 10:42pm UTC](https://forum.kirupa.com/t/clk-sw-majorly-confused/131096/1 "2004-12-11T22:42:36Z")

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Hi,

I am building my own PC for the first time and have found it relatively simple apart from one thing, the setting on the motherboard for “CLK\_SW”.

I have the Gigabyte GA-700N400 Pro2 motherboard, 400FSB, and am using an athlon xp 3200+ socket A processor.

There are two possible settings for the “CLK\_SW” but im baffled as to which one to use - in the manual it reads like this…

[color=red]Default Setting : OFF[/color]  
[color=#ff0000][/color]  
[color=#ff0000]ON = AUTO (Supports FSB 400/333/266 Mhz CPU)[/color]  
[color=#ff0000]OFF = 100Mhz (Fix FSB 200 Mhz CPU)[/color]  
[color=black][/color]  
… my thought is that it would be set to “ON = AUTO” as its 400FSB but someone said that having ddr ram would mean its 200 Mhz, Also why would they have a relitevely new motherboard have the default setting as what i can see as a lower spec?

Hope someone can help and explain this to me.

Help much appreciated, thanks, Chris.  
[color=#ff0000][/color]  
[color=#ff0000][/color]