P4C800-e Dlx Running HOT

[Noozer]

Now a final test. I took a 14" fan and on high ran it right into the case.
Getting TONS of air through there. Case temp dropped to 26, cpu temp BARELY
moved, down to 52. Fan = 26/52.

At this point I'd be pulling off the CPU heatsink and cleaning the CPU/Sink
off and ensuring that they are flat. Apply fresh compound and be extra
careful reinstalling.

I don't know what the temps for a Prescott should be, but I doubt that it's
that high. It sounds like the CPU is not cooling properly or it's defective
(at least reporting the wrong temp). Could also be a voltage out of whack,
overpowering the CPU.

Might be worthwhile swapping CPUs with the shop of friend to see if there
aren any differences.

 

[Jeff Givens]

At this point I'd be pulling off the CPU heatsink and cleaning the CPU/Sink
off and ensuring that they are flat. Apply fresh compound and be extra
careful reinstalling.

One would think it a heat sink/interface matter but the high startup temp
of 45 after 20 seconds is giving me great pause.

However, this evening I will attempt to check the heat sink, although I did
clean it thoroughly when installing the Zalman.

I don't know what the temps for a Prescott should be, but I doubt that it's
that high. It sounds like the CPU is not cooling properly or it's defective
(at least reporting the wrong temp). Could also be a voltage out of whack,
overpowering the CPU.

Intel tells me that for the 3.0E max on-die temp is 69. From what I gather
the thermal cutout/throttling starts at 20 over Tc, Tc being max case
temperature, which at 89W they list as I think in the low 70's.

Might be worthwhile swapping CPUs with the shop of friend to see if there
aren any differences.

Always a good diagnostic however I know no one that has a PC for this
processor.

_________________________________________________________________
JG... Jeff Givens
mailto:jgivensXX@comcastXX.netXX

"My hovercraft is full of eels."

 

[Silvertip]

I'm running a 2.6@3.24 (250fsb) with 1gb OCZ PC4200@3-4-4-8, 1:1 (250).
Is your mem set to run at SPD? If so, try relaxing the timings a little and
I bet you will get to 250fsb. I am running at default voltage on both cpu
and memory. Been too busy trying a couple of flight sims to bother much
with taking it higher.
Silvertip

 

[Ken]

This is the second heat sink. First one was the stock Intel one and I've
since added a Zalman. When I removed the Intel one the thermal compound
appeared to be evenly distributed with no apparent visual problems.

The thermal compound must be very, very thin layer.

 

[Jeff Givens]

Following up on the hot Prescott thread, some findings of mine.

First, Intel email support was useless. All they could tell me was
essentially 'if under 68 C then all is ok', despite my specific questions
about temperature ramp up times (I was wondering about why a cold system
was reading almost 50 in 20 seconds - thinking there may be a problem with
the winbond or Asus temp adc).

Asus has been totally non-responsive. Only 1 email received, telling me to
be sure I had the latest BIOS, even though my initial contact with them
plainly indicated that I had 1017 in place. No response to the reply that
pointed this fact out to them.

I was playing with some video and did some rendering and boy did it get
hot. I reached 75 C and this is with the case all opened up. I've been
watching eBay for some dead socket 478 boards so I could at least try to
get into the BIOS and see what temps were being reported (trying to see if
the motherboard temp reporting was correct) but no luck there.

Being tired of running this thing at 70+ I tried something. I made a
cylinder of paper that fits over the Zalman, forcing all the incoming air
to come from about 12 inches above the case. I then did some heavy video
rendering and the temps were 20+ *lower* than the 'unducted' ones. I was
running at 52-55 whereas the night before with just the opened case I had
hit 75.

This is so bizarre. The case temps are reporting moderately low - low 30's
(closed up - am all opened up at the moment and case is reporting 44 - go
figure on that one). I am getting an almost 40 C delta between case and die
temps.

I can't explain it - even blowing a big floor fan, while keeping me in the
low 50's (light load), did not get it down into the temperatures that most
are reporting.

The ducting sure is significant. At least I know now that I can run
(assuming the temps reported are correct) within Intel specs, albeit still
higher than what others are reporting.

All I have to do now is fabricate some ducting to sit on the Zalman and
mating with a hole in the cover, yet that allows the cover to be slid on
and off.
_________________________________________________________________
JG... Jeff Givens
mailto:jgivensXX@comcastXX.netXX

"My hovercraft is full of eels."

 

[Paul]

Following up on the hot Prescott thread, some findings of mine.

First, Intel email support was useless. All they could tell me was
essentially 'if under 68 C then all is ok', despite my specific questions
about temperature ramp up times (I was wondering about why a cold system
was reading almost 50 in 20 seconds - thinking there may be a problem with
the winbond or Asus temp adc).

Asus has been totally non-responsive. Only 1 email received, telling me to
be sure I had the latest BIOS, even though my initial contact with them
plainly indicated that I had 1017 in place. No response to the reply that
pointed this fact out to them.

I was playing with some video and did some rendering and boy did it get
hot. I reached 75 C and this is with the case all opened up. I've been
watching eBay for some dead socket 478 boards so I could at least try to
get into the BIOS and see what temps were being reported (trying to see if
the motherboard temp reporting was correct) but no luck there.

Being tired of running this thing at 70+ I tried something. I made a
cylinder of paper that fits over the Zalman, forcing all the incoming air
to come from about 12 inches above the case. I then did some heavy video
rendering and the temps were 20+ *lower* than the 'unducted' ones. I was
running at 52-55 whereas the night before with just the opened case I had
hit 75.

This is so bizarre. The case temps are reporting moderately low - low 30's
(closed up - am all opened up at the moment and case is reporting 44 - go
figure on that one). I am getting an almost 40 C delta between case and die
temps.

I can't explain it - even blowing a big floor fan, while keeping me in the
low 50's (light load), did not get it down into the temperatures that most
are reporting.

The ducting sure is significant. At least I know now that I can run
(assuming the temps reported are correct) within Intel specs, albeit still
higher than what others are reporting.

All I have to do now is fabricate some ducting to sit on the Zalman and
mating with a hole in the cover, yet that allows the cover to be slid on
and off.
_________________________________________________________________
JG... Jeff Givens
mailto:jgivensXX@comcastXX.netXX

"My hovercraft is full of eels."

That is an excellent observation. I noticed when I installed my
7000A-AlCu, that there is a "warm cloud" of air around the fins
of the heatsink. I figured that means there would be a premium
placed on moving more air through the case than is normal. The
Zalman seems to work by fan blade turbulence, rather than true
air circulation. The fan blades stir the air locally, so that heat
is transferred from the heatsink fins into the local air. Obviously
this process stops, unless something can get that air away from the
area of the heatsink. If you hold your hand around the outside
of the Zalman, you won't feel a current of air blowing on your
fingers. Your duct is an excellent way to redefine the airflow
pattern, so the local recirculation is interrupted.

Patent your idea first, and then license it to Zalman

Paul

 

[oparr]

Does your case have rear exhaust fans in the vicinity of the CPU?

 

[Jeff Givens]

area of the heatsink. If you hold your hand around the outside
of the Zalman, you won't feel a current of air blowing on your

There is a fair amount of air flow - it is just distributed about the
circumference of the fins as well as coming down from the top. Wet a finger
and hold it next to the fins. The side away from the HS will get nice and
cool. The problem is that, even with the case top removed, it seems that
the locally heated air is what is being drawn back down into the HS. This
air can be previously used air from the Zalman fan or air coming from
around the graphics card, northbridge or drive bay. Ducting it at least
gives some cooler air.

Ideally I would like to craft some ducting that makes use of an opened slot
cover but I don't think this is feasible for air flow reasons. The Zalman
fan is moving a fair amount of air mass. If I even partially obstruct my
paper ducting at the top the pressure drop causes the sides to slightly
collapse inwards.

_________________________________________________________________
JG... Jeff Givens
mailto:jgivensXX@comcastXX.netXX

"My hovercraft is full of eels."

 

[Jeff Givens]

Does your case have rear exhaust fans in the vicinity of the CPU?

Yes, it's an Antec Overture. There is one in the back, air passing through
two hard drives, and one on the side as well.

With everything removed from the case but mobo and PS, all opened up, I was
still getting very high temps.
_________________________________________________________________
JG... Jeff Givens
mailto:jgivensXX@comcastXX.netXX

"My hovercraft is full of eels."

 

[OldBoy]

That is an excellent observation. I noticed when I installed my
7000A-AlCu, that there is a "warm cloud" of air around the fins
of the heatsink. I figured that means there would be a premium
placed on moving more air through the case than is normal. The
Zalman seems to work by fan blade turbulence, rather than true
air circulation. The fan blades stir the air locally, so that heat
is transferred from the heatsink fins into the local air. Obviously
this process stops, unless something can get that air away from the
area of the heatsink. If you hold your hand around the outside
of the Zalman, you won't feel a current of air blowing on your
fingers. Your duct is an excellent way to redefine the airflow
pattern, so the local recirculation is interrupted.

Patent your idea first, and then license it to Zalman

Aopen case (600 series) comes withe a duct!

Gr. Jan

 

[Fishhead]

Yes, it's an Antec Overture. There is one in the back, air passing through
two hard drives, and one on the side as well.

With everything removed from the case but mobo and PS, all opened up, I
was
still getting very high temps.

With your case opened up you will naturally get higher temps as the air is
not being ncirculated properly over the cpu etc...