P4 3.0E socket 478 SL7PM (E0) inbox first results

[antonio.araujo]

http://clientes.netvisao.pt/antomore/SL7PM.jpg

It has potential for sure but maybe it's not for me...

I want a quiet system only with air cooling and I can't get this cpu prime stable above 3.75 Ghz. Above 3.3 Ghz it starts 100% throttling when at > 62ºC and it won't boot with more than 1.6v. Frequency is not reduced and performance looks the same but ThrottleWatch shows 100% TM1 throttling all the time when running 2 threads of prime95.

My current system is an Asus P4C800-ED with 2x512 Adata 566 TCCD.
I tried 1.45; 1.5; 1.55 and 1.6 vcore with no luck.
At 1.6v the system shuts down after a few mins...
Vagp is 1.6v e and vdimm is 2.85v.
Mem is 2.5 - 3 - 3 - 8, PAT and Hyper-Threading are on.
I use Zalman 7000Cu @ 1900 rpms.

My previous setup for 1 year and a half and 100% prime stable and day to day use was the same motherboard with a P4 2.4C@3.3 Ghz and 2x512 cheap Twinmos DDR400. The cooler is the same.

This is my first prescott experience and I don't if they're all like this E0 but it seems very very sensible to temperatures and voltages changes.

After all i'm disapointed with this cpu that was so hard to find.
Maybe someone can help me to get better results...
Tks a lot (and good hunt if you're on phase change or even water :rolleyes: )

[tomslick]

Hi,
I have a 3.0 DO and have had similar results from poor thermal compound application. I have three processors and I like to play with them all so I have encountered this more than once. (My waterblock is tuff to get any movement when seating it on the cpu). My suggestion is use artic silver 5 and follow the instructions for P4s near the bottom of this page. I hope this helps.

http://www.arcticsilver.com/arctic_silver_instructions.htm

[Vio1]

not too shabby. If you want to oc your computer in silence... you gotta go water cooling. 3.75ghz on air is an awesome oc for a 3.0e... be happy with it.

BTW, next time you post a screenie of your results, try cropping the image so that it isnt so big. If you need a good program that screenshots and crops... download SnagIt



WELCOME TO THE FORUM

[jenko]

My 3.0e CO stepping does 3.6ghz prime stable with 1.425 vcore fsb 240, im trying to burn it in to see if i can get it down to 1.4125vcore.
Hows case ventilation? maybe you could do a duct mod with fan to supply your zalman with cool air.

[batboy]

Prescotts run at least 10+ degrees hotter than Northwoods. This should be no surprise if you did your homework. So, you are forcing an overclock with inadequate cooling and overvolting up to 1.6v (when 1.5v should be max), then you complain? If you want quiet, go watercooling, otherwise stick to Northwoods.

[antonio.araujo]

It's true, you're all right :bang head

Too much expectations for this E0 cpu but 750 mhz overclock isn't that bad for silent air cooling... :eh?:

Maybe it's time for A64, this cpu can't get much better than my previous overclocked 2.4C :bang head

[batboy]

It will O/C a lot more with better cooling. One way to increase air flow is to install 120mm fans. They move more air at lower RPM than smaller fans. The lower the RPM, the quieter the fan. Slap a XP-120 heatsink on that sucker and you'll have great cooling and it will still be fairly quiet. I've talked to A64 owners and they run a little warm too. Not as warm as a Prescott, but certainly warmer than a Northwood.

[antonio.araujo]

Well, i have nice air flow in my case with 2 front fans blowing in and 2 rear fans blowing out a lots of free space...

I don't care much about temps if the cpu is stable... My problem is that this sucker won't stabilize at decent speed :(

[jenko]

Have you booted up memtest to check your ram?

[batboy]

There might be other issues combining to hold back your O/C. Might try looser timings to make sure it's not your RAM. That Asus mob does droop vcore under load. A lot more with a Prescott than with a Northwood.

[BigStan]

antonio.araujo ~ What kind of PSU do you have on that rig?

[antonio.araujo]

I'm sure ram is ok. I've used memtest and lowered it's speed.

My PSU is an Enermax 460W.

Maybe a droop mod would help but i can't do that by myself :cry:

[BigStan]

At 1.6v the system shuts down after a few mins...
When you say shuts down, do you mean it totally turns it self off and you have to power up again?

[antonio.araujo]

Totally turns itself off!!! :mad:

And i have all thermal features disabled in bios... :(

[BigStan]

That's a classic symptom that your PSU is having problems. Can't keep up with the load so it gives up.

[uclajd]

I just got a Thermaltake 680 and it does the same thing, shuts off under load. And it doesn't take any 10 minutes. RMA'd it, and the new one does the same thing!

So, I await the OCZ 600 from the Egg. :-/

[Sneaky]

can someone point me in the direction of a 3.0E 478 for sale online? /me wants


and btw, OCZ 600w = sex

[batboy]

Maybe try PMing Antonio since he's unhappy. Newegg.com and Zipzoomfly.com have them in stock.

[antonio.araujo]

SuperPI score just for fun :burn:
http://clientes.netvisao.pt/antomore/4237.jpg

Sadly I can't it stable at 3.8 for day to day use :bang head

[hawtrawkr]

whats your psu 12v rail amp rating?

[antonio.araujo]

Enermax 460W --> +12v: 36A

[hawtrawkr]

Enermax 460W --> +12v: 36A


well that should be more than enough to power it without much hassle

with the throttling your getting sounds like your dealing with heat issues and might want a diffrent air cooling solution the problem with wanting quiet operation is that it usually will cost some of the performance youd get with a louder alternative (particularly when dealing with air)

@62c on a asus p4c800 your probably breaking 70c in reality the probe they use to read the cpus temp isnt nearly as accurate as a calculation across the core.

[jenko]

As hawtrawkr said 62c on a asus means very possible throttling.
Unzip this prog and run it then run two instances of prime95 on large ftts till up to max temp to if your throttling.

I posted the throttle watch prog here.
http://www.ocforums.com/showthread.php?t=356874

[hawtrawkr]

As hawtrawkr said 62c on a asus means very possible throttling.
Unzip this prog and run it then run two instances of prime95 on large ftts till up to max temp to if your throttling.

I posted the throttle watch prog here.
http://www.ocforums.com/showthread.php?t=356874


im not 100% but i think hes already determined that it is throttling he was just wondering why it was throttling and why he was getting sudden reboots.

his reading of 62c would lead him to belive his temps are all in line and shouldnt be throttling yet and he would be right in that assumption the problem lies in the inaccuracy of the temperature probe and is causing him to throttle when everything appears to be in a "accepted" temperature range.

batboys sig has a link to his prescott cooling article which to my knowledge has only served to help out everyone whos read it which would be a great start in a direction towards a higher oc.

id recomend some work on the cooling since it would appear that would be the thing limiting you atm. a bit higher vagp and less vcore would probably take you higher once you can get your temps in line provided your psu is true to its 12v rail rating. also 277mhz is a fairly high oc for a passively cooled nb as well. ive found that 875p chipsets tend to start toping out around this area without some added cooling and asus imho should have included active cooling on the nb since they tout the p4c800-e as a oc friendly board.

from some of the clocks in your ss youve posted it would appear that you got a very good chip indeed it just needs a little love most likely. id first try lowering the vcore to no more than 1.5 though and thats still high for a air cooled prescott.

oh and having a dmm on hand to see what your psu is actually putting out wouldnt hurt the cause either.

[batboy]

It's no surprise to me he's getting reboots forcing 1.6v. The poor mosfets are about ready to melt.

[hawtrawkr]

It's no surprise to me he's getting reboots forcing 1.6v. The poor mosfets are about ready to melt.

yeah on a prescott with that kind of draw going through them id advise sinking them from 1.5 up.

im using a revision 2 atm and even with the extra fets i couldnt keep my finger on them when id run dual primes even around 1.47

[antonio.araujo]

Well, i give up! I'm selling the cpu :(
Thank you all for the help, i think prescott is not a good cpu for oveclocking with silent air cooling...

[Sneaky]

PM me with info on the proc f/s - i'm interested