northwood for prescott

[VT]

Archived from groups: alt.comp.hardware.overclocking (More info?)

I've decided that the heat issues associated with my 3E Prescott is not
worth the hassle. I can't run the Prescott in my case without the damn cpu
freezing my system up after 10 minutes of use...never mind overclocked. So,
I found a 3C (used) and I'm trading down...up? Whatever...
What kind of temps does the 3C run on average and how much overclock are
they capable of...without water cooling?

 

[Guest]

Archived from groups: alt.comp.hardware.overclocking (More info?)

"VT" <here@now.com> wrote in message...
> I've decided that the heat issues associated with my 3E Prescott
> is not worth the hassle. I can't run the Prescott in my case without
> the damn cpu freezing my system up after 10 minutes of use...never
> mind overclocked.

Prescott is too hot, no question about that, but if you can't get one to run
stable, chances are that there is a backward criticism of your case
ventilation or CPU thermal solution there, or possibly an underlying cause
of problems elsewhere in your system.

> So, I found a 3C (used) and I'm trading down...up?

Up. At the same clock speed, the Northwood will do around 10-15% more
instructions.

> What kind of temps does the 3C run on average

Difficult to give any sort of prediction as to what you'll find as mileage
obviously varies from case to case and board to board. However, it probably
wouldn't be too unrealistic to suggest that a 10 degree celsius reduction in
idle temps, and a full load reduction of anything between 10C and 25C would
be a possibility.

> and how much overclock are they capable of...without water
> cooling?

Again mileage varies, but with a 3.0C, you could reasonably expect anything
between 3.4 and 3.6GHz, plus/minus a little more at either end of the scale,
depending on whether you get a relative dud or a peach. Either way, you
should find the Northwood far easier to cool at whatever speed it eventually
ends up going to, while the lower clock for clock power consumption should
also give your motherboard and power supply a significantly easier time.
--


Richard Hopkins
Cardiff, Wales, United Kingdom
(replace .nospam with .com in reply address)

The UK's leading technology reseller www.dabs.com

 

[VT]

Archived from groups: alt.comp.hardware.overclocking (More info?)

"Richard Hopkins" <richh@dsl.nospam.com> wrote in message
news:41e7c474$0$19162$cc9e4d1f@news-text.dial.pipex.com...
> "VT" <here@now.com> wrote in message...
>> I've decided that the heat issues associated with my 3E Prescott
>> is not worth the hassle. I can't run the Prescott in my case without
>> the damn cpu freezing my system up after 10 minutes of use...never
>> mind overclocked.
>
> Prescott is too hot, no question about that, but if you can't get one to
> run stable, chances are that there is a backward criticism of your case
> ventilation or CPU thermal solution there, or possibly an underlying cause
> of problems elsewhere in your system.
>
>> So, I found a 3C (used) and I'm trading down...up?
>
> Up. At the same clock speed, the Northwood will do around 10-15% more
> instructions.
>
>> What kind of temps does the 3C run on average
>
> Difficult to give any sort of prediction as to what you'll find as mileage
> obviously varies from case to case and board to board. However, it
> probably wouldn't be too unrealistic to suggest that a 10 degree celsius
> reduction in idle temps, and a full load reduction of anything between 10C
> and 25C would be a possibility.
>
>> and how much overclock are they capable of...without water
>> cooling?
>
> Again mileage varies, but with a 3.0C, you could reasonably expect
> anything between 3.4 and 3.6GHz, plus/minus a little more at either end of
> the scale, depending on whether you get a relative dud or a peach. Either
> way, you should find the Northwood far easier to cool at whatever speed it
> eventually ends up going to, while the lower clock for clock power
> consumption should also give your motherboard and power supply a
> significantly easier time.
> --
>
>
> Richard Hopkins
> Cardiff, Wales, United Kingdom
> (replace .nospam with .com in reply address)

OK I sold my Prescott 3E and used the cash to buy the used Northwood 3C.
System is stable at 3.5GHz and still only 24C+/- stock idle and 33C+/- under
load!
When I had the Prescott in I had to run higher DIMM voltage (0.1+) and even
higher agp voltage (0.1+)
Temps ranged with my case closed idle at 45C...and if under load it was much
higher 50C - 55C+.
The Northwood runs stable and cool at stock settings with my case closed...I
don't even have to boost the core cpu voltage!
Northwood is a much more friendlier cpu than the Prescott.

 

[Guest]

Archived from groups: alt.comp.hardware.overclocking (More info?)

Prescott CPUs are high wattage CPU, but not unreasonably:
o Thermal dissipation from the CPU is high
---- and additionally from the CPU VRM supplying current to it
o So chassis temperature is important on 2 fronts
---- CPU intake temperature + Chassis temperature

Essentially case-temperature (case-ambient) is key:
o Intel specify the CPU cooler fan intake should be <38oC
o Intel specify a temp controlled CPU cooler solution see
---- >38oC cooler intake = run at high speed
---- <32oC cooler intake = run at low speed

So the ideal is case temperature <32oC, ie, near room-ambient.

CPU-coolers cool just the CPU - once heated is removed from
the CPU-Heatsink it must be exhausted by the case fans.

Airflow through a case is limited by:
o Fan grills - on intake & exhaust
---- punched round wire can flow just 45-55% free air
---- round wire grills by comparison flow 89-91% free air
o Front intake plastic fascia cut-out
---- a case breathes through the lowest common denominator
---- often through a cutout of 3"x1" - 1/2 the area of 1x 80mm fan
o Fan airflow capability
---- intake fans are not directly additive in cfm to exhaust fans
---- intake fans are additive in static pressure, so *assist* exhaust fans
o Fan airflow path
---- front lower bottom should be intake
---- rear upper top should be exhaust
---- short-circuits to the airflow path will affect temperatures directly
---- eg, a missing drive bay cover, open rear exhaust fan port etc

An indicator of a case having insufficient air changes per hour:
o Case-ambient is far above room-ambient
---- so the CPU, Graphics card, RAM/CPU-VRMs will run hot
o HD temperature is "the wrong side" of 45-48oC
---- HD makers recommend temperature limits, find temp via S.M.A.R.T. tools
o Operating a PC with the side off lowers temperatures
---- thus the CPU cooler was recirculating a lot of its own heated air
---- thus the case fans were not exhausting that air fast enough

Airflow & Case Temps can be improved by simply changing grills.
Around 84% of the airflow resistance in a case can be the case grills.

Sometimes adding a plain grill in the lower-side-front can ease the airflow
resistance of a case and allow the exhaust fans to do their job better. If
an exhaust fan port exists behind the CPU, use it - it will directly remove
heated air from the CPU cooler before it can be recirculated.

Typical CPU coolers recirculate 40-70% of their own airflow, thus the
fan on the cooler has to spin correspondingly faster to compensate. By
removing this recirculation you gain benefits in both noise & temperature.

The Northwood is arguably a better processor than the Prescott from a
thermal perspective - performance is as good, if not better in some cases,
and it dissipates quite a lot less power both at full load & at idle. Prescott
dissipates some 50W sitting there doing nothing due to leakage current.
--
Dorothy Bradbury
www.dorothybradbury.co.uk for quiet Panaflo fans

 

[Guest]

Archived from groups: alt.comp.hardware.overclocking (More info?)

"VT" <here@now.com> ¦b¶l¥ó news😀UbGd.83632$nN6.18738@edtnps84 ¤¤¼¶¼g...
>
>
> OK I sold my Prescott 3E and used the cash to buy the used Northwood 3C.
> System is stable at 3.5GHz and still only 24C+/- stock idle and 33C+/-
under
> load!
> When I had the Prescott in I had to run higher DIMM voltage (0.1+) and
even
> higher agp voltage (0.1+)
> Temps ranged with my case closed idle at 45C...and if under load it was
much
> higher 50C - 55C+.
> The Northwood runs stable and cool at stock settings with my case
closed...I
> don't even have to boost the core cpu voltage!
> Northwood is a much more friendlier cpu than the Prescott.
>

Nice to hear bro. I almost got a prescott myself a few month ago cuz of the
1MB cache But picked a northwood instead from reading posts. I was
afraid there're other issues with your ventilation but seems you're fine.