4 and 5 GHz P4 OC's seem more than possible

[Penguin4x4]

OK, did the math. Seeing how Intel's run cooler than AMD's, I tried a few equations. a 2.0 P4 with 80W max thermal output@2V running 4GHz would only be @ 210W. Seeing that P4's run an "optimal" 60W output,(I'm guessing 70W, Intel won't say), that'd be @180W. Hacking the BIOS is definitely necessary, but just think about it. With the brand new 2.5B processors running @266 FSB with either RDRAM @ 141/250 or DDR@ 13/16 and locked PCI/AGP busses, you'd have a 5.06GHz processor, which at 2V would be 213W. Correct me if I'm wrong here.....

[jazztrumpet216]

If the core could do it and you had the cooling to do it, yeah, an easy 5GHz man.

[Penguin4x4]

Seems good enough to me (http://www.swiftnets.com/products/mcw462.asp). Grab an 11x6 Radiator and 4 Panaflo H1A's in a push pull configuration, thats 440CFM blowing across it, hook those suckers to a thermal sensor, hmm, I may have to try this............................

[Roof Jumper]

ID wait to try it though until the "prescotts" come out at 3.2 ghrz, when there will be new core possibilities. you could getr an easy 50% overclock .

[ol' man]

Originally posted by Penguin4x4
OK, did the math. Seeing how Intel's run cooler than AMD's, I tried a few equations. a 2.0 P4 with 80W max thermal output@2V running 4GHz would only be @ 210W. Seeing that P4's run an "optimal" 60W output,(I'm guessing 70W, Intel won't say), that'd be @180W. Hacking the BIOS is definitely necessary, but just think about it. With the brand new 2.5B processors running @266 FSB with either RDRAM @ 141/250 or DDR@ 13/16 and locked PCI/AGP busses, you'd have a 5.06GHz processor, which at 2V would be 213W. Correct me if I'm wrong here.....

Only 210W :eek:

Yeah I see no reason for the prescott to not hit 5GHz on LN2. Possibly more like 5.5GHz. You can't hit 4GHz with a Northwood on regular water cooling! Even phase change would be pushing it!

[OC-Master]

Um, LOL 5GHz is soo slow LOL

Intel already has 20000Mhz ready to roll:mad:
http://www.zdnet.co.jp/news/0106/12/intel_chau_m.html

As long as I can play Quake 3 Arena at 1333FPS, I'll be happy ok, leave me alone;)


DS-Master

[Bender]

The only problem is a P4 puts out WAY more heat than that. At 2.0v 3 GHz a P4 puts out somewhere around 150 watts of heat not 80.

[TC]

A 4GHz overclock.....MAYBE a year from now if you're realy lucky and you use a vapochill or something like that.

[TASOS]

Wait & remember this

We will see 4ghz / 5ghz Intel default speeds after 2-3 years
when the cores will be @0.09 micro

[Penguin4x4]

Originally posted by Bender
The only problem is a P4 puts out WAY more heat than that. At 2.0v 3 GHz a P4 puts out somewhere around 150 watts of heat not 80.

Well, do P4's run cooler than AMD's? I am just guessing the numbers, using

[(Actual vCore ÷ Stock vCore) x (Actual Speed ÷ Stock Speed)] x Maximum Thermal Output

I have gone through Intel's white paper's and all I can find is "optimal thermal output" @ 60W. I know XP+ AMD's run 82W. So I used 80W to demonstrate:

[(2 ÷ 1.5) × (4 ÷ 2)] × 80 = 213 1/3 W.

Which Is Proportional:

[(2 ÷ 1.5) × (5.06 ÷ 2.53)] × 80 = 213 1/3 W

Seeing as P4's run cooler than AMD's, I used 70W:

[(2 ÷ 1.5) × (4 ÷ 2)] × 80 = 186 2/3 W

[(2 ÷ 1.5) × (5.06 ÷ 2.53)] × 80 = 186 2/3 W


See my point?

:) :)

[Penguin4x4]

bump

[Penguin4x4]

bump #2

[JudgeDredd]

It's not so much the heat, but the limit of the processor. There's a break point to were no matter how much cooling you're using and how much voltage, you're not gonna get to go as high as you want.

Here are the current record breakers, if want to call it that. (http://www.vr-zone.com/guides/Intel/Northwood/)

4 GHz is possible, but not without LN2 cooling and using 2.1V. I don't consider this a regular overclock, cause you can't run it 24/7 and use it as a regular PC. Those are just record breakers, nothing more. Right now, 4 GHz is for the records, it'll be a year or so before it becomes a basic overclock.

[Overclocker456]

NO you can't do 4GHz or 5GHz with any northwood using water or phase change.... PERIOD.. PRESCOTT is the .9micron CPU that will let up hit around 4GHz OC when it comes out... And that's next year...

[GoodKarma]

Originally posted by Penguin4x4


I am just guessing the numbers, using

[(Actual vCore ÷ Stock vCore) x (Actual Speed ÷ Stock Speed)] x Maximum Thermal Output

I have gone through Intel's white paper's and all I can find is "optimal thermal output" @ 60W. I know XP+ AMD's run 82W. So I used 80W to demonstrate:

[(2 ÷ 1.5) × (4 ÷ 2)] × 80 = 213 1/3 W.



Other issues aside, your formula is wrong. The correct formula is:

Pn = Po * (Fn / Fo) * (Vn / Vo)^2

where:

Pn = Power generated under new settings
Po = Power generated under old settings
Fn = New frequency of CPU
Fo = Old frequency of CPU
Vn = New voltage of CPU
Vo = Old voltage of CPU

[notice the square of the voltage ratio]

So...your calculation is actually

[(2 ÷ 1.5)^2 × (4 ÷ 2)] × 80 = 284 W.

That's a lotta heat! I'll wait for the Prescotts.