Athlon 1200 won't run at 133 mhz bus

[Guest]

I just got an Athlon 1200c with an Abit KT7A and when I set it to run at 133 Mhz and 1200 core, the system doesn't boot until a couple tries and then it resets the processor for a slower chip and it boots. It runs fine at 100 Mhz FSB and I'm pretty sure I wasn't slipped a chip with 100Mhz FSB. I do have a 250w power supply which I think is the problem. I have 2 CD drives, 1 HDD, a zip, GeForce2 GTS, NIC card, and SB 16 plugged in. My new 350W case is coming in tommorow, so I'll try that. But I was just wondering if anybody knew this to be the problem for sure. My chip is Family 6, Model 4, Stepping 2. Can this be determined as a 1200Mhz 'C' type Athlon (133/266 bus)? Thanks for the help guys!

Athlon 1200c 256Mb
ABIT KT7A133
Creative Geforce2 GTS
Win2000

 

[Guest]

set the mobo jumper to 133mhz not 100mhz

 

[FatBurger]

Abit KT7a is jumperless. You have to do it in BIOS. You didn't even read his question, since he said he's set it at 133, and it wouldn't boot.

Have you looked at the chip to make sure it's really a c?
That's probably not it, but you might want to make sure.

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[Guest]

Actually I was having problems with my ASUS A7M/266 in jumperless mode - it was very unstable and often wouldn't boot. Then I switched off jumperless mode and switched to setting the fsb with DIP switches. Thankfully its now running at 133Mhz FSB ok. Not sure if the Abit supports this.......
Then again it could also be your power supply. Having said that my 1400 Athlon is running on a 250 W PSU.

 

[Guest]

Are you setting the RAM frequency or the FSB?

 

[Bud]

I remember a guy once made a long explanation of why a good 250w psu can be better than a bad 300w....But I still think all you cats who build athlons on 250w PSUs are crazy.
It's just asking for trouble =8-]

Zeidlern, You'll need to check the die to be sure. I think u
should see something like this, A1200xxxxC or A1200xxxxB

I'm not in touch with my feeings, and I like it that way!<P ID="edit"><FONT SIZE=-1><EM>Edited by bud on 07/12/01 11:51 PM.</EM></FONT></P>

 

[FatBurger]

Not sure if the Abit supports this.......

Abit KT7a is jumperless

I agree that a good 250w is better than a bad 300w. Sometimes manufacturers cheat to get the numbers they show. You might as well just get a good brand 300w, though.

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[DSutcliffe]

Don't forget to update to the newest BIOS, I assume you have't since you did not state that you did.

Check out my rig:
<A HREF="http://www.anandtech.com/mysystemrig.html?id=3737" target="_new">http://www.anandtech.com/mysystemrig.html?id=3737</A>

 

[noko]

I recommend a 350 or 400w P/S with a double fan setup. Allows for future upgrades and plenty of power for your next system if you upgrade your motherboard to a duel setup. You can get a LeadMan PowMax 400w P/S with duel fan, built in inrush current, over temperature, over current, and overvoltage protection circuits for $60.

 

[noko]

Power Supply does become vary important when you over clock. I have a 400w Power Supply and I can get my 1.2ghz T-Bird up to 1.52ghz. 1.46ghz is totally stable as can be seen by this image:

<A HREF="http://home.cfl.rr.com/noko/146bench.jpg" target="_new">1.2@1.46 kicking a P4</A>

Note all the temperatures voltages and benchmarks also cpu usage. This was over 1 hour at 100% cpu usage without any problems.

 

[FatBurger]

Holy crap! What kind of fan do you have on your heatsink? It's at 7400RPM.

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[noko]

LOL, it is the famous delta fan that creates a mini twister inside your case. It is also being used as my exhaust fan taking out the heat from the cpu. Believe it or not the air coming out of this fan is more then warm.

 

[FatBurger]

I have a Delta fan, and it hangs around 6900-7000. It's not supposed to go all the way to 7400.

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[noko]

Look at the 12v voltage, that is one reason it is running higher. With my previous 250w p/s the fan never ranned at that speed, 400w P/S helps. Plus how I have my setup with the fan exhausting out of the case is more efficient since turburlence at the discharge of fan is virtually eliminated, so in short the fan is more efficient and pulling more air throught the heat sink. I am running a core voltage of over 1.90 volts and overclocked and my cpu temperture is below 50c. This is indicating very good cooling with the Alpha cooler considering its small heat sink design.

 

[FatBurger]

Ah, ok. I understand now.

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