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AMD Athlon XP

H

hawk46

Junior Member
Just installed an AMD Athlon XP 1800+ and I've been having a problem with it. It seems to be underclocked becuase its only running at 1145mhz instead of 1.5ghz. I looked in the bios and got some readings for the CPU:

CPU Speed - 100/100mhz
Frequency - 100mhz
Temp - 123F

I'm using the stock fan and wasnt sure if i should fiddle with the speed settings as i might mess up my processor.
 
Go into your BIOS and set the FSB (Front Side Bus) or Frequency to 133MHz and you will have your full speed.
 
The xp chips have a cpu fsb of 133fsb...The reason the default is 100fsb is the fact that many who buy the mobo may have a duron or older 200fsb tbirds....

xp 1800+ = 11.5 x 133.33fsb = 1.53ghz

yours...........11.5 x 100fsb = 1.15ghz

Take fsb up to 133 and if you have pc2100 or greater ram then go 133/133 in the bios...
 
Ok I tried changing the Frequency as you said and it wouldnt let me select that the only value I could change is the CPU Speed to 133/133mhz and currently im using PC133 SDRAM.
 
It should work fine, theres another setting in the BIOS for the Memory...make sure it isnt set to HCLCK + PCI, just to HCLCK
 
yep...go ahead and set it....When I said pc2100 I should have stated pc133 as well for some of those older boards...PC2100 is effectively 133 like pc133sdram except for the fact it takes that 133 x 2 (double data rate or DDR)...

The only memory that would need 100 would be pc100 or pc1600 ddr (100x2)...
 
It should work fine, theres another setting in the BIOS for the Memory...make sure it isnt set to HCLCK + PCI, just to HCLCK
Click to expand...


If he has settings in the bios like 100/100 or 133/133 it sounds a lot like the ECS mobo and you would not have another setting like you suggest...That is setting the mem...It is mem/cpu ratio....

Now with bios that states 100/33 or 133/33 (fsb/pci) then it would likely have a separate ratio for memory.
 
Ok I changed the CPU Speed to 133/133mhz but now when I start windows after about 2 mins or so it just locks up and freezes and I have to reboot. Any ideas?
 
Are you overheating? You could try sitting in the BIOS for a few minutes and monitor the temp. I know this really doesn't put much stress on the cpu. You could also try running SisSoftSandra (it's a free download) immediately after booting into windows and do some diagnostics. Maybe your memory is not up to snuff. There are several things you could do to test the memory: underclock the mem, test one stick at a time (if you have 2 sticks), run full mem diag at boot (disable quick boot in bios), or a standalone program.
 
Check and make sure your CPU voltage is what it's supposed to be at. For some reason after I installed my nVidia video card, CPU voltage dropped to 1.5 volts... spec is 1.75... so I changed the setting in the bios to +.25 volts and now it runs at 1.75 like it's supposed to, no more lock ups.
 
Well the CPU does not seem to be running hot in the bios when i change it and i dont think its the voltage (its 1.744 right now).
 
Heatsink is seated perfectly on the CPU just cant figure out why it freezes. Could a reason be the DRAM? It sets the DRAM to 133mhz also when i change the CPU speed and it wont let me lower it.
 
I have seen this exact same problem, I told someone ocmponentes to buy, Abit NV7R, xp 1800+, crucial memory, and the stupoid Frickin thing wont run faster than 114FSB, so it is at 1311MHz. I did not put it together so I thought they might have left the tape on the bottom of the heat sink (it was retail), but since the dummies had to rush and maul it, I figured they could deal with it. I did call AMD, and they said the NV7R is not on our recommende list, so even though it is a retail processor they were punks about it and I did not want to deal with it, so.... tell me if you figure it out. (oh when I did it right and 1800+PR, then it froze when windows loaded)

I should, and so should you

take processor throw in another machine to see if it is good.

Take ram and throw in another machine to see if good.
Doing that should pinpoint your problem, but you prob see why i have not done it, its not my machine, and its a pain in the arse
 
Well your right it sure is a pain in the arse because I'm losing a lot of power but I can't seem to find a solution. I dont really have another machine that I could test the CPU/memory in. (None of my friends would let me anyway)
 
Try lowering your memory timings. And make sure your PSU can supply enough current for the XP to run properly. Try the fail-safe setting in your BIOS, then up the FSB to 133/133.

Cheers
 
I had a similar problem with a soyo board. Solution was to set everything in the bios back to default and then walk through the speed settings that you have gone through. I do have one more question. Is this the same mobo that you had prior to installing the new xp? If it is your system may not support the cpu at all. You may want to check the mobo website for an upgrade to the bios that can allow the board to support the 266 fsb. If it can then you are going to have to look at the multiplier for help.
 
I had the same problem with the ECS K7S5A and SD-RAM. I tried 3 different types of SD-RAM and 2 different K7S5A boards. I lowered all memory timing as well and it just didn't like to run at 133FSB. I finally exchanged the memory for DDR and paid the extra cash and it's ok now. In my assessment, the tbred cores are not supported with SD-RAM on the KT-266a chipset.
 
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