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Overclocking AMD X2 4200+ conundrum

post #1 of 8
Thread Starter 
My initial goal was to see how high I could push my FSB, however while doing so I've discovered this conundrum. This one has got me really baffled and so I have come here to seek help from the great overclocking minds at Overclock.net to try to shed some light on my overclocking conudrum

I have played around with trying a variety of different multipliers to try to isoloate the problem, however the example below I believe is the simplest of demonstrating the issue I'm having.


Ok, here is my problem:

I successfully have overclocked my AMD AthlonX2 4200+ Brisbane G2 out to 2.75GHz stable with Prime95 running 3 hours before error.

(CPU x 11) x FSB 250 = 2750MHz @ 1.4v, with a (HTT x 4) and RAM DDR2-800 2T multiplier.



Now, if I maintain all my settings as listed above but reduce my RAM multiplier down to DDR2-677/533/400 the system boots fine without an issue. But....

If I then reduce my CPU multiplier down to x10 ...... FAIL. System refuses to P.O.S.T



However if I bring the FSB back down to default 200MHz, it boots successfully:

(CPU x 10) x FSB 200 = 2000MHz @ 1.4v, with a (HTT x 4) and RAM DDR2-677


Any suggestions of why its misbehaving?

Thanks !
Meh, good enough
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post #2 of 8
My motherboard does the exact same thing... except it wont let me OC past +30HZ unless i tweak like a mofo. Im not familiar with your motherboard but it could be the cause of your problem.
post #3 of 8
Screw the 10x then...
Full load temp dependent, up the vcore and work on the CPU bus speed
Or... throw a 9x at it!
    
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post #4 of 8
Thread Starter 
Quote:
Originally Posted by Odyn View Post
My motherboard does the exact same thing... except it wont let me OC past +30HZ unless i tweak like a mofo. Im not familiar with your motherboard but it could be the cause of your problem.
Thanks for the post.

I have actually experienced this same problem on an ASUS M3A. The ASUS had very average/poor cooling for the MOSFETs and NB so I upgraded to the Abit AX78 with has superior cooling in those affected areas (as I thought it was a NB related issue that was limiting my ability to push the FSB above 250).

Both motherboards utilise the AMD 770 chipset.
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by The Duke View Post
Screw the 10x then...
Full load temp dependent, up the vcore and work on the CPU bus speed
Or... throw a 9x at it!
Thanks for your post.

I apologise, I should have stated that in the main post (have just edited it to reflect that point).

What you're mentioning was my exact goal to begin with

I seem to be continually FSB limited to around 250MHz, both on the ASUS M3A and my now Abit AX78, however I have seen others push the AMD770 chipset much higher, so I know it can.

I've in the past tried dropping the CPU multiplier ridiculously low to (CPU x5) with DDR2-400 and (HTT x 3) but all without much success.

I've also tried overvolting everything quite high, pushing the CPU @ 1.6v and increasing NB voltages by around 20%. But still no luck on P.O.S.T
Meh, good enough
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Meh, good enough
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post #6 of 8
Thread Starter 
Is there a chance the CPU may have a faulty clock multiplier? (the quartz crystal inside the CPU, right?)

That is, that the crystal malfuntions when ran at various CPU multipliers (e.g. x8, x9, x 10 etc) combined with certain FSB speeds?

My CPU seems to run optimally at the default (CPU x 11) multiplier rather than any similarly lower multiplier (can't test higher multipliers ofcourse as its factory locked), and so that's why they boxed and shipped it out as a 4200+ ???
Meh, good enough
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Meh, good enough
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post #7 of 8
Thread Starter 
Also, to run my CPU @ 2.75GHz with some level of stability, I need atleast 1.375v

Bad chip?
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post #8 of 8
3 hours before crashing doesn't sound stable to me. I like to see 24+ hours of prime95 with NO errors.
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