Athelon 1800+ frequency question

[Lazyolddog]

I have an Athelon XP 1800+ on a Asus A7N8X board. I upgraded memory and was using memtest to check it out. Memtest said the CPU was running at 1.1 Ghz. I thought the 1800+ was supposed to run at 1.53 Ghz. Isn't it supposed to run at 1.53?

I went to CMOS and checked the settings. The CPU external frequency is set at 100 (range is 100-212) and the multiplier is 11x. Is the CMOS not set to run the CPU at its 1.53 speed?

When I tried to up the CPU external frequency (to something like 120), at boot up I get a CPU over speed message and machine locks up.

I'm not trying to get a super speed out of this CPU, but I would like to get it to at least do what it was designed to do. Is it doing that already? If not, how should I change the CMOS settings to do it?

 

[fishmahn]

Doesnt' sound like it is set right. The 1800+ should run at 1.533ghz. That's 133mhz frequency and 11.5 multiplier.

I don't know that mobo directly, but there should be BIOS and/or motherboard jumpers to let you select the FSB frequency and multiplier. Some mobos have 2 spots for frequency - one to set the 'base' frequency (100, 133, 166, etc.) and one to fine-tune (or over/underclock) the frequency. To make sure the PCI bus is clocked right, make sure you change the base frequency to 133. That may be why you got the overclock warning when you tried 120 - the PCI bus was trying to run at 40mhz instead of 33, and it didn't like it.

Mike.

<font color=blue>Outside of a dog, a book is man's best friend. Inside the dog its too dark to read.
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[TheRod]

I got an A7N8X in the past. I think there is a Jumper on the mobo you must set to the correct operation mode (100/133/166/200). If you have an OLD A7N8X, it might not officially supports 200MHz. Your jumper might bet set to 100MHz operation mode instead of 133/166MHz.

Athlon XP 1800+ default is 133x11.5

I was running mine at 166x11.5 without any problems for 2-3 years.

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