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Just built a new machine, and need some clarification.

Old 07-30-04, 12:49 AM
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Just built a new machine, and need some clarification.

Hey everyone. I just built a new machine, first I've built since 800mhz was the fastest..LOL! So some of these technologies are new to me. Okay here's what I have and then I'll ask my question.

I bought a Gigabyte GA-7N400-L motherboard. Found here. . The board supports front side bus 400/333/266. And it supports DDR memory 400/333/266.

I bought an AMD XP 2500+ 333mhz FSB w/ 512 L2 Cache and I bought a PC-3200 DDR400 512MB Geil stick of RAM.

Okay there are only two areas on the board to select the clock speed and multiplier. It says the set the board to Auto unless your clock speed is 200mhz. It also has the multiplier set to Auto by default. When I boot up the PC it shows the chip as an XP 1900+ 1.43ghz chip.

So I enter the bios and change the FSB frequency to 166mhz and now it shows up as an Athlon XP 2500+ like it should.

Why did I have to change the bios to 166mhz? The only options in the bios for FSB frequency are 100mhz, 133mhz (default), 166mhz, and 200mhz. Why is it that my CPU is 333mhz FSB and the motherboard says the AUTO setting supports FSB 400/333/266 but you can't specify 400/333/266?? And what should this thing be set to if I haven't done it right?

The last time I built a pc you have a 100mhz FSB and if you had an 800mhz CPU you set the multiplier to 8x and you were done..LOL!

It's running great and it reads 2500+ fine now, but I want to make sure it's running at it's optimum abilities. Also the CPU is running about 125, is this okay? Or is that too hot? I have a retail AMD with the heatsink and fan, no extra thermal compound, as I don't plan to overclock.

Thanks everyone!!
Old 07-30-04, 12:58 AM
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The 166MHz setting actually equates to 166MHz x 2 (333MHz) FSB with DDR (Double Data Rate) memory.
Old 07-30-04, 01:01 AM
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Originally posted by X
The 166MHz setting actually equates to 166MHz x 2 (333MHz) FSB with DDR memory.
Okay so I got it right then? So you don't actually select the FSB speed of the CPU? I only have one stick of DDR so I'm not really taking full advantage of it right?
Old 07-30-04, 01:04 AM
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You set it correctly.

But DDR memory only needs one stick. Data is transferred both on the leading and trailing edges of the clock signal, thus the doubling of the clock speed.

You're thinking of dual-channel where you need two matched sticks. That doesn't change the FSB.
Old 07-30-04, 01:16 AM
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Sweetness. Thanks X!!

I was getting a little confused there with all these different bus speeds, etc. Just glad I got it right and it's running like a champ.

Thanks again for your clarification.

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