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XP2100+ external clock frequency settings

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In advance, sorry to sound noobish, but it's my first time building a computer, so I want to make sure everything is right. I have an Athlon XP 2100+, Chaintech Apogee 7VJL, and Corsair DDR333 memory. Now, I'm supposed to set the external clock frequency on the board, and my choices are 100 MHz, 133 MHZ, and 166MHz. Their defualt setting is 100MHz. Now, I don't want to OC anything here (not yet at least😉), but I want to be sure that i'm not going to be losing any performance either. So, is it best to stay with their default 100MHz, or should I change to 133 or 166?? I want to be sure that the DDR333 is going to be used efficiently too. Any help you can give would be GREATLY appreciated! 🙂

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default for an xp2100+ is 133mhz fsb (thats what its refering to about "external clock") 100mhz would be an underclock, and 166mhz an overclock 🙂


the memory you can either run it synchronous with the fsb (at 133mhz also) which would be pc2100 speed... or you can run it at 166mhz (pc2700)
 
Thanks for the quick reply. 🙂 🙂 So, I should set the external clock jumper (FSB) to 133 MHz if I want the Athon default. But in order to get the full DDR333 speed i would need to set it to 166, which is considered "overclocking". Is there a way to do them separately?? Sorry to be a pain, but I don't want to fry anything just yet. 🙂

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default for an athlonxp with pc2700(ddr333) on a kt333 chipset board

default would be fsb at 133mhz, memory at 166mhz (since pc2700 is designed to run 166mhz)

the kt333 chipset officially supports both 133mhz/133mhz (fsb/mem) and 133mhz/166mhz(fsb/mem)
it doesnt officially support 166mhz/166mhz (but many boards will overclock to those settings)
 
Sorry, I just remembered this part of a review that I read on this mobo before I bought it.

"Overclockers will like the extensive options available in the BIOS for tweaking the system to run at its optimum speed. FSB settings are available in the BIOS (jumperless) from 100MHz to 250MHz in increments of 1MHz. However, there are two jumpers which you'll need to set in order to determine which FSB ranges you would like to access (between 100, 133 and 166MHz). Voltage settings are also available, but unfortunately, the full range is not available. For our Athlon XP 2000+, the board only allowed us to tweak the voltages from the default 1.75V to 2.00V. However, 2.00V is actually 0.15V above the maximum voltage specifications of the Athlon (1.85V). The additional 0.15V will definitely be an added overclocking advantage that power users want. Other voltages adjustable via the BIOS are :-

AGP Voltage - Default (1.50V), 1.65V, 1.80V, 1.95V
Chipset Voltage - Default (2.50V), 2.65V, 2.80V, 2.95V
DDR Voltage - Default (2.50V), 2.65V, 2.80V, 2.95V "

later....

"We did not have much luck with overclocking the 7VJL Apogee. Although there are FSB settings all the way from 100MHz to 250MHz in 1MHz increments, we did not managed to overclock it above 145MHz. This is not surprising as not many boards have the capability to run at 166MHz. It was disappointing as the board came with jumpers for 166MHz settings, but alas, was rather redundant. In addition, increasing the chipset voltage to the maximum did not help in the overclocking either. "

So, what's your opinion???
 
running a fsb of 133mhz with your memory at 166mhz is totally in spec and your motherboard should have no problems doing that

but as for running 166/166 (which i mentioned above) not all boards can do it
boards with a 1/5th pci divider tend to be able to run 166/166 without any problems (the abit/asus/epox/msi boards based on the kt333 chipset all hit 166mhz fsb with no problems)

so if your not planning on overclocking just leave everything at its default setting, and set the fsb at 133mhz, and set the memory at 166mhz (i imagine its in the bios where you set the memory bus speed)
 
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