OCing 2.8Ghz to 3.36 locks up and video corruption ?

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ScottFern

ScottFern

Diamond Member
Oct 23, 2002
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Well, I installed my Enermax power supply along with my Kingston HyperX PC4000 2X512.

I am now at 3.5Ghz, with the stock speeds at 2.8Ghz.

In my bios, I selected DDR400, vddr = 2.85v, vcore = 1.66v, and the AGP settings to 66.66/33.33.

memory is 1:1 with 3-4-4-8 timing.

Any suggestions, comments, or tweaks!?

250fsb*14= 3.5Ghz :)

I can get into WindowsXP and do my normal stuff, but I can't encode for any type of OC. Now, I am at 3.36Ghz and it still will lock up and/or reset the computer. I don't understand whats the weak link here :(

CPU display
 
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thelanx

Diamond Member
Jul 3, 2000
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Many asus boards under report the temp. However, 47C isn't too bad, even on an asus board. Try bumping the vcore up a notch and run prime95 for a few hours or a day or longer if you want to test stability.
 
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PhoenixOrion

Diamond Member
May 4, 2004
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At an overclock of 20% to 3.36Ghz, you should not need vcore adjustment.

Assuming that you are using 2.8 "c" northwood chip, these cpu's are very good overclockers that the stability might come from your PC3200 memory. 2.8c perform great on i875 chipset (canterwood) mobo like the p4c800-de.

You didn't mention what brand of memory you are using.

My suggestion is to ditch the AI OC function and set everything manually:
1. set the fsb/mem divider to 5:4 instead of 1:1 with both vcore and vddr at default. at 3.36Ghz, check stability. if not stable then you know your cpu is the bottleneck.

2. if stable after step 1, change divider back to 1:1. then set vddr to 2.8v and "lock" or "fix" the agp/pci frequency. overclock to the 20% by raising fsb to 240. if not stable at this point, then start bumping vcore. default should be 1.52v and keep bumping no higher than 1.62v to avoid premature aging of cpu.
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
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1 512MB of ram is Samsung with a heatspreader, and the other ram stick is non name brand, i forgot which ??

I might try that overclocking suggestion you just said, thanks!
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
3,629
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76
You don't think it could be the PSU ? I also just installed the SP1 slowdown hotfix, but i don't think it could be that.

Symptoms
1) Computer locked under load
2) Computer reset itself
3) Video reset itself and came back with corruption ???

From these 3 symptoms what would you say ?

1) RAM
2) PSU
3) Cooling ???
 
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yourdeardaniel

Golden Member
Mar 20, 2004
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use 1 stick of memory
use 5:4 divider or 3:2
use 2.8v vdimm or max of whatever voltage ur ram is rated for
considering the fact that you're using an 6800 gt, it could be the PSU.
try a 480 or 550w, preferably enermax, pc power and cooling.

also.. the P4C800-E (not sure about P4C800) has vcore drooping problem which could be the cause..
but most like it's the power supply
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
3,629
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Its not the P4C800-E, i know it sounds confusing, but its actually the P4C800 deluxe which I am 99% sure it different. It says so on the box, so I know for a fact, I don't have the -E.

I have to tend to agree with you, since I have a power sucking video card, and i did experience video corruption with this card after 3 days. Also, it explains the intermittent lockups. Unstable voltages ??

Anyone else agree its my Tru-Silent PSU ???
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
3,629
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yikes, $119 for a 550w Enermax, is this the price of overclocking ? haha
 
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PhoenixOrion

Diamond Member
May 4, 2004
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your psu and mobo are great items.

its your ram. running at 1:1 with a ddr400 (200mhz rated) will surely make your box unstable anything over 200mhz fsb.
 
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o1die

Diamond Member
Jul 8, 2001
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2 different sticks of memory will sometimes give you problems. Try just one stick, and see if stability improves.
 
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Tiamat

Lifer
Nov 25, 2003
14,068
5
71
If your box fails memtest86, you almost (99%) know your ram is too unstable. If your PSU voltages dont fluctuate too much, then it is fine. If you have low volts on 12V rail, be concerned and start looking for a better PSU. You dont need 500+ watts of a quality PSU. 480W will be plenty enough
 
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ectx

Golden Member
Jan 25, 2000
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T\You got soem good suggestions here. There is no magic solution w/ocing (other than not ocing at all). You just have to go through a process of eliminations and run different tests. Before you go out and buy a new psu, be sure you know it is causing the problem. What are the voltage radings? Usually it would give you some clues.

My bet is on the memory,
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
3,629
2
76
After watching ASUS Probe now for a while, the +12V and the 3.3V are the two that are fluctuating and the lines in the graph are swiggly a little, and the +5V and the Vcore are straight lines......

I can't help but think it is the 12V rail as said earlier?? And now your telling me it might be the memory ??
 
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yourdeardaniel

Golden Member
Mar 20, 2004
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have u tried any of the methods suggested?
2 different stick sof memory will give you instability most likely
and try overclocking manually instead of using AI Overclock
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
3,629
2
76
No, I have not tried your method yet. I am going to try the manual overclock with the 5:4 3:2 divider ? I am not sure what difference that makes? Pardon the ignorance.

I keep telling myself it can't be the RAM cuz it would be a whore to sell 1GB of RAM and then buy it again but name brand ??

To me, the voltage problem explains the video corruption, because memory issues wouldn't do that ???

I am debating having to sell my memory, or just buy a new PSU, and it seems likely considering its a cheap brand.
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
3,629
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76
60W extra, I don't think I will be drawing that much power, but I have heard great things about Enermax too.
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
3,629
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UPDATE: PSU shipped, and I am in the works for trading my ram for Kingston HyperX PC4000 2X512MB ram.

It got up to 260fsb in a review, all I could say was WOW. Kingston ram + enermax psu, I don't know what is else could stand in the way of my overclocking goals? :)
 
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stnicralisk

Golden Member
Jan 18, 2004
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Originally posted by: ScottFern
UPDATE: PSU shipped, and I am in the works for trading my ram for Kingston HyperX PC4000 2X512MB ram.

It got up to 260fsb in a review, all I could say was WOW. Kingston ram + enermax psu, I don't know what is else could stand in the way of my overclocking goals? :)
Click to expand...

Your CPU could. :)
 
ScottFern

ScottFern

Diamond Member
Oct 23, 2002
3,629
2
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well, the CPU is now at 3.5Ghz from 2.8Ghz originally, these P4s are overclocking beasts! I am happy.
 
N

Navid

Diamond Member
Jul 26, 2004
5,053
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Originally posted by: ScottFern
Well, I installed my Enermax power supply along with my Kingston HyperX PC4000 2X512.

I am now at 3.5Ghz, with the stock speeds at 2.8Ghz.

In my bios, I selected DDR400, vddr = 2.85v, vcore = 1.66v, and the AGP settings to 66.66/33.33.

memory is 1:1 with 3-4-4-8 timing.

Any suggestions, comments, or tweaks!?

250fsb*14= 3.5Ghz :)

I have not run Memtest yet, I am doing a sort of trial and error at this point, so far so good.
Click to expand...


As far as the video corruption goes, you may want to have a look at this thread and see if it is related or not.
http://www.abxzone.com/forums/showthread.php?t=62275
 
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