Overclock 2.8c with a 250 fsb

[SaiyanX]

HEY! I have a Asus P4P800-deluxe motherboard and a P4 2.8c processor running with 2x256 of GEIL ultra platinum PC4000. I have all my ram settings at 2.5-4-4-7 and when i overclock it with a fsb of 250, its 3.5 ghz!! It boots up and everything but it won't load into windows xp pro. what is the problem? my stock cooler on the p4 keeps by processors well below the heat average at 38 when i checked in the bios. I want to see if i can go more but it always restarts when it is trying to load windows. I have a 350 watt psu and it runs perfectly stable. help me!

 

[PukePile]

Sounds like your chip can't run that high back off by 10 mhz and see what happens.Also you might want to run memtest and see if its your ram.But if your at a 1:1 ratio the ram wouldnt be your limiting factor

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[Cybercraig]

You'll have to give the CPU move voltage. Try it at 1.575v. Take it up slowly, say 4mhz at a time once above 230FSB. You may have to drop your timings back to 3,4,4,8 to run that fast with no errors! Your stock cooler won't be good enough for that speed either. Watch your temps closely.


Abit IS7 - 2.8C @ 3.30 - Mushkin PC4000 (2 X 512) - Sapphire 9800Pro - TT 420 watt Pure Power
Samsung 120gb ATA-100 - Maxtor 40gb ATA - 100
Sony DRU-510A - EAT ME MSI!

 

[Vapor]

1) set timings to 3.4.4.8
2) set VCore to 1.675V
3) work FSB up to 230MHz in 6MHz increments...testing for stability each time with memtest or Prime 95
4) work FSB from 230MHz to 250+MHz in 4MHz increments...testing for stability each time with memtest or Prime95
5) after finding the highest stable clock, lower it a tad and try to tighten your RAM timings and lowering your CPU voltage....SLOWLY though.

Maxtor disgraces the six letters that make Matrox.

 

[Cybercraig]

Better feed that RAM at least 2.8v too!

Abit IS7 - 2.8C @ 3.30 - Mushkin PC4000 (2 X 512) - Sapphire 9800Pro - TT 420 watt Pure Power
Samsung 120gb ATA-100 - Maxtor 40gb ATA - 100
Sony DRU-510A - EAT ME MSI!

 

[jammydodger]

2) set VCore to 1.675V

sounds a little high to me, if he is only using stock cooling. I would say 1.6v.

I think you are being a little over optimistic trying to get to 3.5 on stock cooling and standard voltage btw.
Your RAM should run find at 2.5-3-3-4 (250Mhz FSB) at about 2.7v, mine does.

 

[Vapor]

No, 1.7V isn't even too high for stock cooling...I've had my 3.06 (the same processor that actually has a higher TDP than Prescotts up to 3.2GHz) at 1.7V for about a month (I tried OCing, but my RDRAM and/or AGP/PCI won't even go to 134FSB, so my CPU remained at stock speed) with a stock cooler and I was perfectly fine (my temps were only slightly higher than what they are now at 1.525V). A Northwood C at 1.675V and <3.5GHz is <b>FINE</b> on stock cooling!! Anyway, as long as temps are alright...stock or better aircooling will handle 1.7V. Higher and the processor will die of being overvolted (D1 stepping at least) unless very well cooled (at least water).

Anyway, if you read what I wrote initially, it says start at 1.675 (or even 1.7) and then get to the max clockspeed and back down a bit....then lower voltage and tighten the timings.

Also, just because your RAM can do one thing does not mean his can do the same...especially with Kingston.

Maxtor disgraces the six letters that make Matrox.

 

[Cybercraig]

You've got to remember that the 2.8C comes with that solid block aluminum heatsink. Your 3.06 was a copper core. When I switched to a lapped copper 3.2C heatsink my temps dropped about 5C. I don't think the stock cooler is going to handle 3.5 @ 1.675v very well. The good news is he can lay the case on it's side, take the heatsink off, put a frying pan in it's place and cook breakfast while he surfs the net! :lol:


Abit IS7 - 2.8C @ 3.30 - Mushkin PC4000 (2 X 512) - Sapphire 9800Pro - TT 420 watt Pure Power
Samsung 120gb ATA-100 - Maxtor 40gb ATA - 100
Sony DRU-510A - EAT ME MSI!

 

[Vapor]

How much do you want to bet that mine doesn't have a copper core?! I bought this OEM and used the 2.66's stock cooler...my 2.66 definitely did NOT come with a copper core.

I wonder why nobody reads the last line of my first post...find max at those settings, back down a bit, tighten timings and lower voltage! I'm not recommending 3.5 at 1.675 (not that there would be any bad in doing that...just a higher temps all around), but a little lower MHz with a lower voltage. The climbing to the higher clockspeeds is just to find his highest stable clockspeed possible, NOT his everyday speed.

Maxtor disgraces the six letters that make Matrox.

 

[Cybercraig]

No, I understood your post just fine. I was only kidding about breakfast. But, I am shocked on the 2.66ghz heatsink! I just assumed you were using the stock copper-core. Do you remember your idle and load temps?

Abit IS7 - 2.8C @ 3.30 - Mushkin PC4000 (2 X 512) - Sapphire 9800Pro - TT 420 watt Pure Power
Samsung 120gb ATA-100 - Maxtor 40gb ATA - 100
Sony DRU-510A - EAT ME MSI!

 

[Vapor]

Current idle/load temps: 36/47
at 1.7V: 44/57ish, IIRC.

I can actually run the processor at 1.45V w/o a problem...why I don't is beyond me. It took me awhile to figure out why my 9800Pro wasn't holding it's usual OC...big time artifacting, then I lowered the CPU voltage and now it runs like a champ again .

Maxtor disgraces the six letters that make Matrox.

 

[jammydodger]

Also, just because your RAM can do one thing does not mean his can do the same...especially with Kingston.

He is not using Kingston he is using Geil, and Im using exactly the same RAM. So unless he has got compatability issues with his board then his RAM should do 2.5-3-3-4 @250Mhz (thats what the RAM is rated at).

 

[SaiyanX]

Actually, the V-core on my sensors read 1.6 . I don't want to ruin my processor by increasing the voltage too high. I heard that Asus boards have wrong temperature displays on the CPU. According to this one article, the board read 5-7 degrees lower than the actually temperature. The DDR timings for my GEIL PC4000 is 2.5-4-4-7 so i wouldn't need to increase it to 3-4-4-8. Right now at 2.8 ghz, my asus probe says my processor is at 27c with the stock cooler. Overclocking shouldn't fry it i guess. Anyways, i'm going to try and see what happens!

 

[jammydodger]

Yeh sorry I meant to write 2.5-4-4-7, I thought 2.5-3-3-4 was a little too low. My bad.