Problem with my Duron or mobo?

[Xeo]

Hi all,

First let me tell you what system I'm running

AMD Duron 650 @ 909 8.5X107
Asus A7V Motherboard
PC 133 RAM (oem low quality)
Vantec hs (w/delta fan noisy!!!)
CPU Voltage @ 1.75

idle temp around 42C
load temp around 46C

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My problem is that I can get my cpu to run at over 900 mhz using an 8.5 multiplyer setting and an fsb of 107 or >. However when I switch to a 9.0 multiplyer setting using a fsb of 100 or > my machine won't post.

I don't understand why the 8.5 multiplyer setting will work using higher fsb setting but the 9.0 multiplyer setting won't. I also tried the combination of 7.0 @ 133 giving me 930 mhz but that failed also. The highest I've been able to get my rig to go is 8.5 @ 111 for 943 mhz. That was stable but I can't fathom why a multiplyer setting of 9.0 won't work! I don't really like o'c my pci devices and that is why I went to 107 fsb.

Is this a problem with my mobo or my cpu? The CPU seems to be able to handle the heat (46C load isn't that much), what do you think?

Any suggestions would be helpful.

Thank you in advance,

~Xeo

 

[FRANK]

This is a reply I posted to a previous question on this issue;


>This is a well known and documented problem with all of the first generation Socket A motherboards with the KT133 chipset. The average FSB maximum is in the 107 to 110MHz range. The revised chipset "KT133A", addressed these problems and reports of FSB's in the 150MHz range have been reported. I've gotten to 140MHz myself on an ASUS A7V133. I may need to make the voltage mod if I would like to go higher.<


As far as the multiplier, it sounds as if you may have reached the limit.

Although the DURON 650's are not known to clock as high as the 600's, the CPU database reports an average speed of 910MHz with them, still quite respectful. That being said, I think you can get a bit more out of that chip if you increase the Vcore to the maximum that the motherboard supports, 1.85v. Most successful results have been made with this setting.

Be aware of the temperatures though. Having built several systems off of the ASUS boards I can attest to the inaccurate readings of the onboard monitoring "ASUS Probe". It has been said to report as much as 10C higher than actual, my results seem to confirm this. I believe, "ON THIS" board you will be safe if you can keep your temps no higher than the upper 50C's as reported by the ASUS Probe.

One other thing, the best way to insure a successful overclocking experience, is through research. Read as much as you can find on the various components that you have or intend to use, know the issues with each before you get into problems. A good place to start in your quest for knowledge on this subject is right on the front page of this site under the heading "BEGINNERS GUIDE TO OVERCLOCKING"


Congradulations on your results so far, running at more than 50% over default. A lot of people can't even get close to that.


Research, the key to a successful overclocking experience!

.

 

[Xeo]

I am fully aware of all of the overclocking issues, as I am not a novice overclocker. I just can't explain why I can hit 943 by overclocking the fsb settings on the mobo (with a 8.5 multiplier), but I can't even post at 900 using a multiplier setting of 9.0. It seems to me that 8.5 is the highest my multiplier settings want to go. Personally I think this is an issue with my motherboard and not a limitation of the cpu, I just wanted some feedback to confirm or deny my gut instinct. I have an early A7V motherboard

I've definitely been aware of the inaccuracies with the ASUS probe software. I always check my temp readings using the bios.

 

[FRANK]

From what I've seen with various socket "A" motherboards, some chips seem to "hit a wall" with both the multiplier and FSB.

I also have an early A7V, as well as an A7V133, FIC AZ11 and an FIC AD11. After switching four different CPU's between the above motherboards in various combinations, my results have indicated to me that the sweet spot of a particular CPU is usually at or very near the maximum multiplier, with a little bit more leeway on the FSB. I've seen some slight variations between theese motherboards , but nothing very significant.

With the above boards I've experimented with the KT133, KT133A and the AMD761 chipsets. Other than the issues with the lack of support for the 133 FSB on the KT133 the results have been similar on all of the motherboards.

Now admittedly, I'm no engineer, and my results are by no means scientific, but rather, they are my more than casual observation.

Some of my results;
DURON 600 @ 1100MHz - 8.5*133
DURON 600 @ 1100 - 10*110
T-BIRD 650 @ 892 - 8*105
T-BIRD 1.2-266 @ 1470 - 10.5*140

.