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My first OC of a p4 3.0 would like to hear what you think and I've got some questions

post #1 of 10
Thread Starter 
Hello evreyone I would to start by sying that I have allways wanted to OC but never did becuse I didnt find anyplace with good-easy information on this subject untill I have found overclock.net 2 days agi, after some reading I have started my OC based on the information on this forums, so thank you all!

Now this is the system I have started with (the importent stuff IMO if you need to know anything else let me know):
Intel® Pentium® 4 processor supporting Hyper-Threading Technology (LGA 775) 530 (1M L2 cache 3 GHz 800 MHz FSB 90nm)
1GB of dual channel Corsair Twinx CMX512-3200C2 (XMS3200v4.1 512MB 400Mhz)
Mobo Asus P5P800
Case: Thermaltake Kandalf (the aluminum version)
Cooling on cpu: Titan Aanessa S-type

Now I have managed to push my CPU up to 3.82GHz (FSB 255MHz) working stable with VCore set in bios to run at 1.4250V (3Dmark05 test score 5696 on stock was getting 5544) now my big problem started when trying to go FSB 260MHz I kept raising my vcore up but still unstable system even so I raised it in the bios only in the range of 1.4 and never over 1.5 cpu-z keep telling that I am over 1.58 wiche to my understanding is pretty bad and my cpu started to get to about 60C so too hot for me any recomandations how to get to 3.9?

Another thing is that as soon as I have started overclocking my ram started to work in 266Mhz (used to work at 400) now I'm not really sure how to make it work at 400Mhz if i even need to? the ram is the hard point for me to understand on the overclocking idea any help how should i set my memory to work will be great!


Thank you all in advance!
post #2 of 10
Are your AGP/PCI frequencies respectively locked to 66.6/33.3 MHz ?

Your ram is DDR400 so its effective frequency is 400/2 = 200MHz.
So when your FSB is running normally at 200 MHz the ratio FSB:RAM is 1:1.

When you start increasing your FSB your ram cannot keep up with it as it's rated at only 200MHz so there's something called a divider that is set by your mobo like FSB:RAM = 4:3 and, as such, when your FSB reaches 266MHz your ram will only be working at 200MHz.
In your Bios under "JumperFree Configuration" you should have something called "DRAM Frequency". It should allow you to adjust your ram frequency but I doubt PC3200 ram can work at 266MHz. So my guess is you will still have to run on a FSB:RAM divider like 4:3 and if you push your fsb too high then maybe 5:3.
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by z_one
Are your AGP/PCI frequencies respectively locked to 66.6/33.3 MHz ?

Your ram is DDR400 so its effective frequency is 400/2 = 200MHz.
So when your FSB is running normally at 200 MHz the ratio FSB:RAM is 1:1.

When you start increasing your FSB your ram cannot keep up with it as it's rated at only 200MHz so there's something called a divider that is set by your mobo like FSB:RAM = 4:3 and, as such, when your FSB reaches 266MHz your ram will only be working at 200MHz.
In your Bios under "JumperFree Configuration" you should have something called "DRAM Frequency". It should allow you to adjust your ram frequency but I doubt PC3200 ram can work at 266MHz. So my guess is you will still have to run on a FSB:RAM divider like 4:3 and if you push your fsb too high then maybe 5:3.
Thanks for you'r replay!
Well my AGP/PCI frequencies are set to auto should I lock them? and if so why?

Aboust the ram I am still stragling to undertand evrey part about it the question is can I get my ram to work faster if so how?

Thanks in advance!
post #4 of 10
Quote:
Originally Posted by SilentShadow
Thanks for you'r replay!
Well my AGP/PCI frequencies are set to auto should I lock them? and if so why?

Aboust the ram I am still stragling to undertand evrey part about it the question is can I get my ram to work faster if so how?

Thanks in advance!
Yes you should lock the AGP bus to 66.6 MHz and the PCI bus to 33.3 MHz because there's very little performance to be gained from increasing them. Add to that the fact that when you increase them you will cause your system to become unstable.

You can get your ram to work faster than it's designed for but only to a certain limit. Your ram is made to work at 200 MHz under normal circumstances. Your FSB also works at 200 MHz under normal circumstances.
Check your motherboard specs here.
When you increase your FSB to 250 MHz for example to overclock you are also forcing your ram to communicate with your cpu at that higher speed.
It simply cannot keep up with the increasing values of the FSB. That's why you need a divider so your ram frequency increases less rapidly than your FSB.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by z_one
Yes you should lock the AGP bus to 66.6 MHz and the PCI bus to 33.3 MHz because there's very little performance to be gained from increasing them. Add to that the fact that when you increase them you will cause your system to become unstable.

You can get your ram to work faster than it's designed for but only to a certain limit. Your ram is made to work at 200 MHz under normal circumstances. Your FSB also works at 200 MHz under normal circumstances.
Check your motherboard specs here.
When you increase your FSB to 250 MHz for example to overclock you are also forcing your ram to communicate with your cpu at that higher speed.
It simply cannot keep up with the increasing values of the FSB. That's why you need a divider so your ram frequency increases less rapidly than your FSB.
So basicly what you say is that I cant do much about the ram right? what about overclocking the ram titing the times will that do any good?

And what do you think about my OC any recomandation how to make it better?
post #6 of 10
You do not want to tighten your ram timings because this will make it unstable at high FSB speeds.
Normally when you want to get a higher frequency from your ram you relax your timings a little bit.
You have an Intel system and I'm pretty sure Intel systems prefer relaxed ram timings with a high FSB over tight ram timings with a low fsb.
So do not tighten them.

Concerning your overclock I think you did a great job at taking that cpu to 3.82 GHz however you should keep your vcore under 1.525 if possible as this is the maximum recommended value for a Prescott.
Temperature wise try to keep it below 60C (55C if possible would even be better).

Last but not least download cpu-z here and please post two screenshots of the "cpu" and "memory" tabs once you run it.
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post #7 of 10
Thread Starter 
Here are the photos let me know what you think:



post #8 of 10
Ok your FSB is at 255MHz and your RAM is at 170MHz so you're running on a 3:2 divider.
It means your FSB frequency is 1.5 times higher than your RAM frequency.

Have you tried setting the divider to 1:1 to check if your ram can actually run at 255MHz ?
If you set the divider to 1:1 and your ram cannot take it then try setting the timings to 4-4-4-10 instead of 3-4-4-8 and test again.
If it fails again with the new timings then try increasing the VDimm (ram voltage) by a notch.

If all fails, then I'm afraid you're going to have to keep the 3:2 divider.
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post #9 of 10
Dividers aren't that bad...
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post #10 of 10
Quote:
Originally Posted by Pinhead-227
Dividers aren't that bad...
Agreed. Dividers certainly have their uses. Although 1:1 is the best way to go in an ideal world, dividers (both CPU>RAM and CPU<RAM) can be beneficial in certain circumstances.
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