Re: cooling 8800 GT OC .. some good, some bad ..

On Mon, 28 Jan 2008 16:31:49 GMT, john.dsl@xxxxxxxxxxx (John Lewis)
wrote:

Tim,

What was your 8800GT fan speed at 75degrees C? If you have the old
BIOS it will be 29%, and the old BIOS fan-speed auto-control sticks at
29% until the GPU core temp reaches > 90 degrees C, at which point the
fan speed increases rapidly. My (eVGA) 8800GT vents to the rear.
With the old BIOS, I experimented using a slot-mounted extractor fan
right next to the exhaust end of the 8800GT - no noticeable change in
the maximum recorded core temperature.The 8800GT fan speed
auto-control was totally dominant. My case has excellent inlet
(ambient-temp) air-flow to the video card area. Effective cooling of
the 8800GT with the manufacturer-supplied heat-sink assembly seems to
be more critically dependent on the 8800GT fan speed than anything
else.

With the new BIOS, the 8800GT fan speed starts increasing rapidly
around 75 degrees C . . With the new BIOS in my (well-ventilated)
case, the 8800GT core-temp now does not exceed 81 degrees C
worst-case. Previously it reached 96 degrees in my trials.. I quit
before any worst-case long-duration exercises..

In my particular setup with the new BIOS,the 8800GT fan speed is ~ 55%
@ 81 degrees C core-temp.

If you are using nTune to make the fan speed and temperature
measurements, beware there seems to be a bug that results in a stale
fan-speed measurement unless you fully re-enter the
"overclock/fan-temp" screen. Also, please note that to record the
temperature accurately, you need to be very, very nimble with your
typing fingers. The core temperature can fall at over 2 degree/second
after an ALT-TAB out of Crysis back to the desktop (with nTune or
Rivatuner already open and 'ready to go' on the desktop).

I think by adding a better heatsink and fan, you're treating an
underlying symptom like poor case ventilation which is making your
card run hot.

Tim (Yes, the real one. :) )


Welcome back.

John Lewis

Thanks... :)

I did flash the BIOS of the card. I'll take a look after a decent
length game session. I've just been net surfing and my card shows 50
degree's with the fan at 29%.

When I got the original numbers for my temps for Johns, I did exit
Crysis and immediatlely vie the GPU temp... My fan speed seems to
always show 675RPM in the monitor, so I'll try what you said when I
look at the temps after playing a game.

I think a contributing factor to my low temps is the case. I have an
Antec 900 and I was really careful to maintain an open layout. I'm
curious to see if Johns heat issues subside w/this case. The upper fan
on it has a tube that directs air right across the video card.

Tim

.

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