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My first overclock - Page 3

post #21 of 36
Thread Starter 
Alrighty, Prime 95 has been running for 2 hours with no errors and Memtest hit a wall within 7 seconds. I have tried to loosen the timings (through memtest) to 3-4-4-10, which seems like the highest I could go but it still stops at 7s.
Any advice please?
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post #22 of 36
yeh buy a big typhoon i am just trying to find a cheap one in the uk
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post #23 of 36
Quote:
Originally Posted by Monkey23
I have a P4 @2.4GHz, 512MB RAM DDR400 PC3200 on an ASUS P4P800S-X.
I have read all the guides for overclocking I could find in here but since this
is the first time it gets a bit confusing.
I found within the BIOS an option which overclocks automatically by certain % increments. I have reached 10% (I haven't tried more yet) without any problems , which comes to 2.65GHz.
I use Speedfan which says the CPU is at ~52-54C at idle and the vcore is at 1.42V (I think my CPU is a Prescott )

Is it better to overclock manually rather than the current automatic mode? How further it can go and how?

Any contributions and suggestions are welcome.
Thanks in advace guys.


You might need a better cooler, you want to stay under 55c. on full load, manual overclocking will get you better results, just take your time no use rushing to fast that will cause you grief. go small steps and check for stability, prime95, memtest, superpi are good stress programs.
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post #24 of 36
Thread Starter 
jrabb1920, thanks for the advice. Could you please take a look at post #21?
I have purchased the Akasa fan right after I decided to OC but it doesn't seem
to do much for the processor. Memory is my big concern right now.
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post #25 of 36
I'd say you stuck a wall Monkey. Why don't you try to lower the Clock Speed and get better timings, instead of trying to get a higher CPU number whilst sacrificing your RAM?
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post #26 of 36
Ok Monkey, here's the thing.

If you are failing in memtest then you are failing in windows. However, the computer uses a technology called "ECC" which is Error Correction Code. This means that when your ram is failing on a read/write/verify step it redoes the step until the verification is correct. If it finds a correct verify the code then passes the strap back to the program to continue running.

After five iterations of the error there is a flush of the cache and a new read/write/verify of the data occurs. This is done three times and if the failure continues to occur an errata event is created in the event log and in Prime95. Thus if your system is finding error (and it is if memtest is giving errors) it is validating the errored data through ECC validation and Prime95 is continuing.

Your system is still not stable although the ECC will allow you to continue your programs. Your ram is not creating stop events through non-valid ECC iterations.

I personally would drop your ram to a divider until memtest proves stable.

Here's the thing, every time your ram creates errors it is stalling the system. If it errors through to three or four iterations every five data streams of read/write/verify then your system is slowing down and all the overclocking you are doing is not meeting it's best overclock. It is the antithesis of overclocking.

Some will complain that their overclock seems slower at a certain speed. This is often because errata is being streamed and dealt with through ECC.

Hope this helps and enjoy your overclocking

R
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post #27 of 36
Thread Starter 
That makes sense. Prime 95 has been running for over 6 hours now without failure and ECC is disabled in memtest.
Does the voltage have anything to do with timings or is it just for speed? The vdimm and vcore are currently taking care of automatically from the BIOS although I can switch to manual.
So the only solution would be to back off the frequencies?
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post #28 of 36
Quote:
Originally Posted by Monkey23
That makes sense. Prime 95 has been running for over 6 hours now without failure and ECC is disabled in memtest.
Does the voltage have anything to do with timings or is it just for speed? The vdimm and vcore are currently taking care of automatically from the BIOS although I can switch to manual.
So the only solution would be to back off the frequencies?
Yes, the cpu voltage can help stabilize not only the processing units but also the caches. The DDR voltages help to stabilize the data streaming. What is your DDR voltage settings at the moment? You might be able to raise them and create a stable stream.

Are you still failing in memtest? ECC is disabled in memtest for that very reason. To find the errors that will be passed over by Prime95

R
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post #29 of 36
Thread Starter 
Quote:
Originally Posted by Ropey
Yes, the cpu voltage can help stabilize not only the processing units but also the caches. The DDR voltages help to stabilize the data streaming. What is your DDR voltage settings at the moment? You might be able to raise them and create a stable stream.

Are you still failing in memtest? ECC is disabled in memtest for that very reason. To find the errors that will be passed over by Prime95

R
Both vdimm and vcore are currently automatically controlled by the BIOS. I could try to increase that and see what happens.
SInce it doesn't fail in Windows, do I still have to fix it so that it passes memtest?
Thanks for the effort.
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post #30 of 36
yes u want it to pass memtest because while in windows the system is just "idling" but when u run a game or watch a movie or other demanding programs, it will cause the same type of stress to your ram as memtest... memtest is just simulating the stress caused by these programs so u can see if it is stable or not by running memtest so u dont have to load a game and play it for a few hrs to see if your stable..
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