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Problems with Opteron 144 Overclock

post #1 of 11
Thread Starter 
Hi guys, new to the forum so please bear with. I've been trying to overclock my Opteron, with partial success. Although I'm getting fine cpu speeds, I'm having problems getting my RAM stable.

My aim was to have the RAM at stock speeds with the cpu at ~2.7Ghz. But I'm finding that with the 133Mhz divider, even at 240 FSB Memtest86 goes crazy with errors.

Is the divider broken? Is it possible for a divider to just not work? The 1/2 divider is working fine, but in order to get my RAM back at stock speeds I would need a lower cpu multiplier and have a ludicrous FSB, 400+. I really won't be able to get the most out of my Opteron without the 133 divider.

Has anyone got any suggestions? Cheers.
post #2 of 11
What tests are MemTest86 erroring on, 5 and 8? My guess is you have double sided memory like BH-5 or similar and your motherboards memory controller is picky. You will probably have to set your memory to 2T rather then 1T, and if that does not work loosen your timings a little.

Another issue is your VDimm voltage, what do you have that set at? You might just need to pump a little more juice into your memory.
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post #3 of 11
Thread Starter 
Thanks for your quick reply. I'm not sure about which test, but the instant the tests start, errors occur, at a rate of about 10 per second. My memory's 2 single sided sticks of 512MB.

Timings are on auto except for the divider, and all voltages are on default values. Would it really be nessecary to give them more juice? With the 133 divider and FSB the memory's underclocked I thought.

You say the memory controller may be picky, I was under the impression all memory issues were handled by the cpu. Is that wrong? Cheers.
post #4 of 11
Set the memory to 2T instead of 1T and see if you get more stability and pass the MemTest86.

If you have voltage hungry memory with BH-5 or CH-5 chips, then you may need to bump the voltage up to gain stability. Those types of memory actually do not run at their peak performance until you pump around 3.2 volts into them.
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post #5 of 11
Thread Starter 
The memory was already set to 2T. But I've loosened the timings to 3-5-5-8 and I've got it running stable at 260 FSB. I'll continue to bump it up slowly and see how I do.

I may be showing my ignorance here, but why is it that I needed to loosen my timings on a 133 divider, when on a 1/2 divider I was able to get higher FSB's? What exactly is the relationship between FSB and timings? Also, I didn't change the VDimm, because I don't know how to find out what its default value is. How do I find this out? Cheers.
post #6 of 11
On a 1/2 divider you were running your memory at 50% of your processor, and that is why you were able to acheive a higher frequency with your memory.

What exactly do you have your HTT(FSB) set to? These are useful tools to show people like myself what you have going on CPU-Z, Central Brain Identifier. Download these both and provide screenshots when you post back.

What is the make and model of your memory so we can find out what type of chips it has? Can you not change your VDimm and VCore manually in your bios? I am certain that you can. Play around with your bios and see what you can do.

Here is a helpful tool A64 Tweaker, this application allows you to adjust your timings within windows. If you put in some setting your memory does not like it will crash/freeze windows and you might have to power reset.

Ideally you want your memory to run in 1T. They say your memory only takes a 5% hit in performance with 2T, but I have noticed a bigger decrease in performance then that.

So answer my three questions:1)What is your HTT(FSB) with cpu-z and CBI screen shots?; 2)What is the brand and model of your memory?; 3)Attempt to adjust your VDimm and VCore and report back with your findings?
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post #7 of 11
Quote:
Originally Posted by magicman
The memory was already set to 2T. But I've loosened the timings to 3-5-5-8 and I've got it running stable at 260 FSB. I'll continue to bump it up slowly and see how I do.

I may be showing my ignorance here, but why is it that I needed to loosen my timings on a 133 divider, when on a 1/2 divider I was able to get higher FSB's? What exactly is the relationship between FSB and timings? Also, I didn't change the VDimm, because I don't know how to find out what its default value is. How do I find this out? Cheers.
Most ram will be at 2,6 volts stock, my bios says rdram voltage and has the options of 2.6-2.9, more if i mess with mobo. Try putting it on 2.8 or 2.9 v and see how that works for you. The best place to find out what you ram likes is to go the companies site and find you ram and see what timings and v the suggest because your mobo usually wont put them at that stock.
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post #8 of 11
Some RAM wont don't like excessivly low dividers.
    
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post #9 of 11
Thread Starter 
Thanks guys for the replies. I've currently got a compromise going between cpu and ram. 166Mhz divider, 269 FSB, 220Mhz RAM, 2.42Ghz CPU. I'll be doing some more tweaking but right now I've got uni coursework to do, and I don't want to risk breaking the damned thing lol.

I can change the VDimm no problem. I just wanted to make sure I wasn't giving too much juice over the default settings. So thanks hednik for the values.



I found that my FSB was topping out at near 300 so I decided to stick with the 166Mhz divider and lower FSB for now, at least I have it running stable. One question though, if I overclock to DDR440, but select 2T timings, would the two cancel each other out?
post #10 of 11
Cancel out... not sure what you mean.
The RAM will still run at the bus speed you have it set at. The 2T Command will only effect the RAM's timing.
    
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