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P4 2.0 NW @ 2.8 GHz stable - why not higher?

post #1 of 16
Thread Starter 
i just got all my stuf working(after getting a DOA board from newegg(bastards) and i started overclocking... i got it up to 140fsb(from 100) for a total speed of 2.8 ghz. this is as high as i can go without crashing/not booting. why? i read the other thread where the guy got 3.2 stable, i would like at least 3ghz. i have pc4000 ddr500 ram, 1 gig of it. i have more then enough cooling with my 2 120mm intake and exhaust fans, my big typhoon, and my side case fan. temps when running in prime 95 have NEVER gone above 30 celcius.

can someone give me a little help? how do i 'overclock' the RAM? i can change the latency's, and i think right now its running at 2 3 3 7 while at the 2.8ghz. my multiplier is locked at 20(which is good) but i just cant figure out why it crashes at anything higher then 2.8. my ram can handle it, my cooling is good enough, what am i not changing? i have the asus p4p800 delux, tons of OC'ing features.
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post #2 of 16
Did you lock the AGP/PCI bus speeds to respectively 33.3 and 66.6 MHz ?
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post #3 of 16
Quote:
Originally Posted by z_one
Did you lock the AGP/PCI bus speeds to respectively 33.3 and 66.6 MHz ?

shouldn't it be the other way around? agp 66.6 and pci 33.3
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post #4 of 16
Yes !
My bad... thanks for the wake up call !
AGP @ 66.6 MHz
PCI @ 33.3 MHz
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post #5 of 16
Thread Starter 
yes i did
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post #6 of 16
You have a 40% overclock, which is very admirable. It's quite possible that your CPU just doesn't have any more to give. I would keep trying, however.

How high is your vcore? You can go up to about 1.7 volts on a Northy as long as your temperatures remain under control.

Right now, your RAM is significantly underclocked. The stock speed for your RAM is 250 MHz, and you're running it at 140 MHz. Basically, your RAM isn't even breaking a sweat, despite the large OC of your processor. You can run a divider to increase the RAM speed relative to the CPU. I believe the highest that board will allow you to set it at is DDR400, which would equate to 280 MHz at your current OC. Depending on which applications you run, this may give you somewhat of a performance boost. Since that will take you above the stock speeds, though, you may need to begin loosening timings and/or raising vdimm. I wouldn't suggest you mess with the RAM until you're sure you've found your CPU's max. If anything, this will help performance and not increase the CPU's overclocking potential.
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post #7 of 16
Thread Starter 
thanks, i think that a few more tweeks with the help of you guys can get me to my goal of 3.0, possibly further. here is all the details on the bios settings:

also, Vcore was at 1.55 and occasionally going up to 1.6 under heavy load then settling back down at staying at 1.55. i just upped to 1.65 and started ocing at 105 fsb

cpu external frequency(fsb) 140
agp/pci freq. 66.66/33.33
cpu Vcore voltage 1.65(just changed from AUTO)
agp VDDQ voltage 1.50v
performance mode AUTO
DRAM timings by SPD:
cas 2.5
ras 4
ras to cas delay 4
precharge delay 8

burst length 8

idle timer and refresh rate are set at auto.
VID CMOS - 62 which is the highest setting.

going to run this again at the 140fsb level and see if it posts. if it does, ill increase the fsb by 1.
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post #8 of 16
Thread Starter 
also, when i changed the vcore to 1.65 it sometimes goes up to 1.712... is this unsafe? should i move the vcore back down one notch to 1.625?

oh yeah, max idle temps are 22 celcius and 30 fully loaded running prime 95 for hours.
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post #9 of 16
Thread Starter 
just tried the vcore at 1.65 with the 140 setting, and it wouldnt load. i can get 140 though when i leave the vcore on auto... wierd?

i think the CPU is about to take a dump on me... it just crapped out at the same settings i used yesterday to run a benchmark and got 9800 or something close. guess its time for a new cpu, just gotta find a local shop.
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post #10 of 16
So your maximum 100% load temperature is 30C?

If that is so I would consider increasing the CPU Voltage (vcore) more than what it is currently set at. As Taeric has said 1.7v is the recommended maximum value for the CPU voltage, still if your CPU is going to remain cool (55C or lower) then I would not worry that much about going a bit over that value.
Also make sure that your memory is still running at or below its rated speed or else this could cause stablability issues with the system. You can of course overclock your memory but make sure that it is operating correctly (standard test is to run memtest86 on it).

If you are convinced that it is actually not your CPU that is hindering you I would look in other places, logically I would look to the memory first, if that is not the problem check the PSU, then the next one I would check would be the motherboard (this is presuming all correct settings are implemented in the BIOS).
Something that you could try (relating to the motherboard) is to increase the motherboard voltage one notch to improve data transfer efficiency and this may allow you to hit higher speeds on your processor

Also something that may help to a degree would be to burn in your processor at the highest stable speed you can get, then in the future it may go even higher.
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