Will the P4c 3ghz run @ or above 250fsb???

[eno]

I just read a review on from anandtech about memory and under the final words, they mentioned that the 2.8,3,3.2 ghz CPUs usually cannot reach 250fsb. So if that is the case should I only buy average PC4000 memory for my IS7 that I have in the mail???



Link to review final words


I have extremly good air cooling and during the winter this room gets super cold so some good temps will be present. I have the new SP-94 waiting along with a modded 92mm Tornando. 4x TT SCII fans for intake and outtake and dual 80mm blowing on video card. So my goal is as high as possible overclock. What speed memory do you think I should run on this system??

 

[bacillus]

you'll be lucky if you get 250fsb with a 3GHz though it's not impossible!

 

[1966]

You would need a chip that does 3750mhz.

So I dont think you'll be able to reach 250mhz fsb,very unrealistic goal.

 

[jiffylube1024]

Originally posted by: 1966
You would need a chip that does 3750mhz.

So I dont think you'll be able to reach 250mhz fsb,very unrealistic goal.

^ Ditto. Unless you have some Prometeia/LN2/Dry Ice cooling .

 

[MotoFast]

Im running my P4 2,8C at 3,81Ghz fsb 272 and still standard voltage So why shouldnt 3,0c go to boost to 4Ghz =)

 

[fredtam]

I would recommend getting good pc4000 to allow you to up the FSB as high as it will go without having to change to a 5:4 ratio which would cause you to lose GAT. Maybe 3500 depending on the chip you get .
3450 - 3500MHz is probably going to be top end on the 2.8,3.0,3.2 on air so I would buy memory accordingly.
2.8 = PC4000
3.0 = PC3700
3.2 = PC3500 (best combo because the mem will run at tighter timings )

 

[jiffylube1024]

Originally posted by: MotoFast
Im running my P4 2,8C at 3,81Ghz fsb 272 and still standard voltage So why shouldnt 3,0c go to boost to 4Ghz =)

This is meant to be sarcastic, right?

 

[eno]

So why is that? A 2.4 can overclock higher because it is not close to the chips line threashold? Well if I would have paid full price I would of just got the 2.4 then overclocked it. That sucks because i wanted some high ghz goals like 4ghz, its odd that the slower CPU can overclock 1ghz and the faster only 500mhz.

 

[Jumpem]

Originally posted by: eno
So why is that? A 2.4 can overclock higher because it is not close to the chips line threashold? Well if I would have paid full price I would of just got the 2.4 then overclocked it. That sucks because i wanted some high ghz goals like 4ghz, its odd that the slower CPU can overclock 1ghz and the faster only 500mhz.

How is it odd?.. lol

My dad's 3.0C is stable to about 3.5-3.6.

 

[fredtam]

They are the same chip. They are tested and binned according to the speed they will reliably run at. If a chip won't run 2.6 its tossed in the 2.4 bin. This is how they get 2.4s (and other speeds slower than 3.2). Since there is such a demand for 2.4s Intel has to supply them and since they don't have enough slow chips (2.4s) they throw higher rated chips in the 2.4 bin. Since intel is pretty good at this whole chip making thing the odds of you getting a 2.4 that will only run 2.4 are slim. However if you buy a 2.4 it may in fact only run 2.4.
The fact that your 3.0 will only run 3.5 (on air) is a design limitation. This is why you will see the intro of the Prescott. They cannot get the P4s to run reliably (at production levels) over 3.2.

 

[Mad2Gamer]

just read my article.

it works just fine at even higher speeds...

 

[eno]

Awww OK, and sense the overclocking of it is slightly different than my XP chips I can't just get faster memory and lower the multipler to allow high FSB and keep the CPU at its limit right.

 

[fredtam]

Originally posted by: Mad2Gamer
just read my article.

it works just fine at even higher speeds...

Umm thats with Prometeia not "good" air cooling He won't be able to get anywhere near that on air. If everybody had Prometeia Intel could probably continue with the P4. The fact is that most people don't and the large majority of P4 chips become unstable around (or well before) 3.5 when air cooled.

 

[Mad2Gamer]

I've got it running now on 3.5 Ghz (1.55 vcore, ram 1/1) with stock cooler (prometeia died, fixed now).

got the chip on 04/05/03.
it overclocks verry good, even on low vcore.
a friend got one @ the same time, it does 3.6 with SP-94.
that's "only" 233 fsb.

250 is indeed to high with Aircooling.

didn't read the whole topic sorry about that.

 

[MotoFast]

No.. i can run som test programs and linke here so you can see for your self.. i almopst cant belive it my self.. but now i have some trouble with the memory.. get some errors in mem86 test had to lower it to fsb 266 now... nee better memory.. only have Twinmos PC3200.