here is a little article ( a bit old maybe but still true) on heat and CPU
life span...it includes info on CPU Delta T

http://www.overclockers.com/tips30/

Once upon a time I did a small power test...I had been running my systems
24/7 so for one month I turned them on only when they were in use ...I saved
just under 3.00 per month in power cost....That is for 2 computers.
I believe in the cooler the better...and a small fan.or 3 small 120mm fans
in my case do not amount to a huge amount of power consumption.
These are the fans that I use....note the power
http://www.scythe-usa.com/product/ac...ex_detail.html


peter

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"Craig Fink" wrote in message
...
peter wrote:

The first thing I do when I buy a new chip.........is also buy a new and
Better heatsink one that's capable of 120mm Fan.
Then I buy the fan that pushes the most air at the least noise...and turn
off all Fan Control and let that sucker blow.
Scythe S-FLEX SFF21F 120MM Cooling Fan 1600RPM 28.0DBA 63.7CFM FDB
Thermalright HR-01 Plus 6 Heatpipe Cooler LGA775 AM2 CPU Heatsink *Fan
Not
Included*

Now that the Cooling and noise level is under control.......its time to
over clock.
And as I sit here 2 feet from my OC'd Intel core 2 duo..from 2.3 to 3.2
I
can barely hear the thing.

Based on the info you gave your fan settings are fine
peter



A long time ago, I was into overclocking, still fun, but no longer feel
the
need to be on the bleeding edge. But, still fun to talk about. On article
on Tom's Hardware on overclocking, he mentions cost of running for a year.
Several hundred for eight hours a day.

Yes, any old fan settings are probably fine as long as it's spinning the
fastest it can when the cpu is the hottest. But, the green part of me like
lower recurring costs, the power bill.

I've been thinking about it a little bit more and what criteria is best
for
something other than spinning the fan full speed. I didn't like the
default
fan setting on my cheap motherboard. The default was disabled, no variable
fan.

Start PMM value was 50 with a range of 0-128
PMM value of 0 gave half speed on the fan.
CPU Fan Full Limit Temp was 69 degrees, only one degree below 70 (my
shutdown temp) and way to close for me.

Current Fan settings on my new Q6600 with ECS G31T-M...
AMT bios
Smart Fan Start PMM value... 0
Smart Fan Start Temp. (C)... 37
CPU DeltaT... +5
Smart Fan Slope PWM Value... +15 (PWM/C)
CPU Fan Full Limit Temp 45C

I was rethinking these settings I came up with, and think I'll modify them
again with different criteria that is the greenest I can think of, and the
safest in terms of temperature, not running at the bleeding edge.


Smart Fan Start PMM value... 0 ----------- Fan is spinning the slowest
Smart Fan Start Temp. (C)... 37 ----------- Adjustment for CPU Fan
Full...
CPU DeltaT... +5 ---------I have no idea what this does
Smart Fan Slope PWM Value... +15(PWM/C) - Maximum rate of change of
FanSpeed
CPU Fan Full Limit Temp ??C ------- Temp at 100% CPU w 100% FanSpeed
in the Summer.

My adjustments are Start PMM value, Start Temp, DeltaT and Slope.

CPU Fan Full Limit Temp is the outcome of these settings.

This will give me full fan speed at max temperature for my heatsink and
fan,
and will give me the lowest power usage at idle, and will give me the
smallest temperature change of the CPU/Motherboard from idle to full speed
(reduces thermal cycling).

Anybody know what CPU DeltaT does? Should i reduce it to zero?
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Craig Fink
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