good news on my p4 northwood...maybe...

[Duvie]

Well I am sure some have read my recent threads of my system troubles....I thought I had ruled it down to the cpu but now I may have to look at the overall mobo system....

Last time I left it the cpu would not run at 2.0ghz at any voltage set....1.63v-1.83 (asus voltage boost)

What I have done now is pull the cmos battery and clear the cmos....I know, some will say I should have done this earlier....and stopped using the asus jumper to overvolt....



Now I have been running for past day or so at 2.2ghz to 2.267ghz at 1.575v...prime 95 tested and other applications...mostly multitasking several items trying to force stack dumps and illegal errors....The system will run speeds at lower vcore then prior and have no problems...higher voltage hampers the cpu...is this some timing issues??? many of the errors would happen early before the cpu temps ever got a chance to rise above 40-41c under load...


At 2.4ghz I can post and run smoothly at 1.6v but get a rounding error (yeah, errors I expect to see in prime95)...so I bumped voltage to 1.65v and after an hour or so I got an illegal operation....
temps were low during 2.4ghz test as I got system to 20c and load never got over 42c in prime95....since I have been a lot warmer in other test above heat should be ruled out...ram was kept at auto settings and I have ran prime with memory at 386mhz ddr (memtest checked as well), so no ram issues....


I will check it at 1.625v...asus board on my system actually still shows slightly higher vcore at idle then set in bios....so 1.625v will actualy be like 1.64-1.65v....



I am still waiting to update to the bios 1005 anyways...I am at 1004c now...

 

[Fant]

If you're only at 42C bump up your vcore voltage more until you are stable at 2.4ghz on prime95 for 24hrs.

 

[Duvie]

The problem is 1.6v will give rounding error which is common prime95 error...illegal operation is not normal...when I bump up voltage to 1.65v I get the abnormal error...I do not think higher voltage is the answer. I suspect 1.675 and 1.7v will give same type of error. 1.65v (a whole .05v upgrade) if not stable should have gone longer then got a rounding error if insufficient....in all my testing when I was trying to hit 2.52ghz and above with 1.75v to 1.8v, rounding errors were all I ever got...


What do others think....


I I can get 2.4ghz to run stable at 1.625v...I am done...leavin it alone!!!!

I like the memory scores at 2.267ghz...I get 420mhz ddr and 2880-2900mb/sec...

 

[XBoxLPU]

Glad you finally fixed or at least got your pc working stable.

I have my Vcore set to 1.6500 in the BIOS and If I go in lower, Prime 95 will give me errors.

The Asus probe reports that my vcore stays from 1.6 to 1.616

 

[WarCon]

I finally got my powersupply in and it did stablize the 12v rail, which brought more stability to my overclocks. But after what has been happening to you, I decided to maintain 1.7vcore or less until I see if this is going to be a pattern. So I have limited myself to 148fsb. I can hit 155 with 1.775. It fails Prime95 after some time instead of right away like before but I don't think I am going to run it that high ever. I have considered the wire trick to give me the settings all the way to 1.85 but I really don't think so. I am very happy where I am at right now.

"I will not push it anymore".......yeah right...........😀

 

[slimbim]

so the rounding errors in prime 95 are not significant and can be ignored???

I can boot into windows at FSB 150 and run all other stuff, like PCMark2002, SiSoft Sandra and stuff, but prime 95 will give me rounding erros like right away.

 

[JellyBaby]

Have you yanked off the hsf and reapplied everything just to be sure it's not a problem on that end?

 

[Duvie]

yes...I reseated the cpu and reapplied AS2 days ago....It didn't partially clear up until I stop vcore jumper boosting...With that the vcore even set at 1.5v in bios woud actually be 1.63v...I couldn't virtually do any speeds above default with stack dumps of programs....

Like I said heat is not an issue....this is a voltage issue and whether the board or the chip will take it...


My new power supply antec would get same symtoms eventhough 12v rail looks better and holds better under load....

 

[Duvie]

i wouldn't ignore rounding errors that happen almost immediately....

Now if they happened 4 hours into the program and most apps you don't run under that kind of intensity for that duration, I might say yeah that is fine....

I like running it overnight which can be 8-10 hours....I never run anything much longer then 4 hours anyways....


I got a sumup error which was related to ddr clocked too high at default voltage...boosted to 2.7v ddr and it passed my standards...

 

[BlvdKing]

rounding errors in Prime 95 = bad mkay?