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Clock speed of AMD Sempron 2500 A

by optionist / January 22, 2005 12:47 PM PST

I put together a desktop with the following configurations:

AMD Sempron 2500A
Antec 1650B Case
And used my old PC 2100 256 Meg SRAM, and 160 Gig Wester HD, plus my old generic 48X CDRW.

After putting it together, it's OK, and I know I need to upgrade my RAM to atleast 512 Meg.

What's interesting is that windows XP says: "AMD Athlon XP 1.05 GHz". I thought this Sempron 2500 is supposed to run at 1.75 GHz.

Is it my motherboard setup or what am I missing.

Thanks in advance.

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Bump the FSB up to 133mhz...
by Michael Geist / January 23, 2005 3:39 AM PST

in the Bios and you should see the correct speed. Right now you are probably running at 100mhz.

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it's now saying 1.39 GHz but it's unstable
by optionist / January 23, 2005 12:35 PM PST

Thanks. I did just that and so I put in 132 for the cpu speed. After restarting it, I couldn't even see the bios and so I thought I messed something up and need to reset the cmos, but then after turning it off for 5 min and turning it back on, windows XP started and I see that it now says 1.39 GHz.

Then I restarted it to get into the bios, the computer couldn't turn on. I turned it off and on and XP started it w/o giving me a chance to get in the bios setup.

I'm not sure what's up with it. Any thing else? Are there other sites I can cross check for hlpe. Thanks again.

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I'm running the same
by skippyd333 / January 23, 2005 6:35 PM PST

only I have the same motherboard but a 2400+ semperon.
Do this: clear cmos with jumper on board. unplug computer and set pins for a few seconds. replace to the right 2 pins and boot to bios. Go to frequency control and set cpu clock speed to 180. hit escape key then arrow to save and exit. hit enter set to yes save. thats it. you will be running at 1.8 gigs actually. Thats what i'm running, also you need pc2100 266mhz ddr ram or higher mhz ram. will run up to pc3200 ddr at 400mhz. up to 3 gigs of it. you can never have to much ram. skip

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I'll try and will let you know but
by optionist / January 24, 2005 3:56 AM PST
In reply to: I'm running the same

the last time I did this, the max it allowed me to take the cpu clock in bios setting was 132. I'll reset and follow the steps again and hopefully I can put in the number myself and be stable.

For some reason, even with 132, I can't restart, I have to power it down, wait 5 min, and then restart to get XP started again.

I'll double check the freq of my rams in bios, and see if I can figure out whether it's 266 Mhz or not? Is there pc2100 that's not running at 266 Mhz? Any way, after fixing the cpu clocking, I plan on getting 512 MB of PC3200 for $60.

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by skippyd333 / January 24, 2005 7:12 AM PST

I made the comment about the ram because you said it was pc2100 sram and not ddr. You could also take your ram out and put it in one at a time, nearest the cpu to see if you have a bad stick.
when you clear cmos you need to go back in and reset everything. make sure your dram is reading 133mhz, also your heatsink and fan may not be seated right. Just a few more ideas. skip

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It was the jumper setting
by optionist / January 25, 2005 2:08 PM PST
In reply to: Ram

It turned out that the motherboard had two jumper settings to allow cpu clock from 100 to 200 Mhz. Now that I cleard the cmos and setup the jumper to 200 Mhz, it says that it is "2.10 GHz."

Thanks guys, this just doubled the speed clock. Given that the speed is controlled via the jumper settings, I now think that the bios setting is meaningless, atleast in this particular model or something else I'm missing.

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Keep an eye on the temp.
by skippyd333 / January 26, 2005 8:52 AM PST

in the bios it will show your temp. in celcius. your running fast so watch it. skip

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it's 39 degrees C
by optionist / January 26, 2005 10:37 AM PST

Skip, thanks for reminding me. I checked it out and it says 39 c, is that OK? What's the normal temp? Keep in mind I leave my desktop on all the time. Please let me know if this is too much, and so I get I can reduce it either via the bios or jumper settings.

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it's 39 degrees C
by skippyd333 / January 26, 2005 8:26 PM PST
In reply to: it's 39 degrees C

Thats Great! You shouldn't have any problems at that temp. max is about 70 degrees. I forgot about the jumper settings. I have mine set at pins 2-3 on both. You have yours set at 1-2 jumper8 and 2-3 jumper9. If you do experience any freezing. on your desktop, set it the same as mine and then adjust in the bios frequency. As I said I have a sempron 2400+ supposed to be 1.67ghz but set my frequency to 180 and I am running at 1.8ghz. Skip

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