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Sgt. D. Pilla

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#1 9 years ago

Stupid question, but for some weird reason I can't reduce the fan speed on the 9400GT with either nVidia's CP add-in or EVGA Precision, it just defaults back to 100%. If I disconnect the fan will it effect it much to the point of instability? All the 9400GT is used for is dedicated PhysX and HDMI Output (Aka rendering of BluRay HD movies to 46" Plasma @ 1080p) I"m talking heat wise here.




*Daedalus

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18th April 2006

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#2 9 years ago

Well you know as well as anyone here. My guess would be yeah, it'd be too unstable, but you could always give it a go and see what happens. What's this 9400 in anyway? An Ion or something?




Sgt. D. Pilla

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#3 9 years ago

Yeah I guessed it would, just wasn't 100% sure on how demanding BluRay and PhysX would be on it. It's the GB version so has a nice sized heatsink.

How do you mean, what's it in?




Mr. Pedantic

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8th October 2006

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#4 9 years ago

I'm not so sure. I didn't think PhysX was that demanding on a GPU, IIRC most GPUs clock themselves down to somewhere close to 2D mode and still manage to keep up. As for Blu-Ray, even IGPs can handle that fine. So I don't think that would be too much trouble. But for comparison, with my GPU fan at 20%, my 4870 idles at about 38-40. With no fan, I would estimate about 50-60. If it couldn't handle it you could always just rig a 120mm fan to blow over it instead.

How do you mean, what's it in?

As in, is it in an HTPC or some other cramped form factor where there's little good airflow? Or is it in a full tower with hundreds of cubic feet of air going past per minute?




Sgt. D. Pilla

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#5 9 years ago

It's in my beast - of which I'm swapping all fans over to reduce night time noise. Still keeping my 120CFM huge ass mofos, but swapping the stock case fans for Noctua's which are vastly more quiet and more efficient. The only fan left I can hear is that of the 9400GT (Can't even hear my 275s fan!).

So its in a full sized case with 11 fans - all exhaust bar a 140MM intake and a 230MM intake

I'll unplug the fan and crank with running Crysis haha, that'll show how unstable it maybe!




Sgt. D. Pilla

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#6 9 years ago

70*C for the 9400GT with no fan. Thats idle, doing nothing, not even outputting display lol.




*Daedalus

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#7 9 years ago

My 9400 in my laptop doesn't even hit 70*C on full load. Jesus...

Can you do it in such a way that there's a 120mm intake on your door, to blow air at it or something?




Mr. Pedantic

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#8 9 years ago
My 9400 in my laptop doesn't even hit 70*C on full load. Jesus...

But you'll probably have a fan. Without a fan temperatures can rise very high, because there's absolutely no airflow; the spaces in between the fins of a heatsink aren't wide enough to allow convection currents to flow, so air stagnates there and gets hotter and hotter, and since air is such a poor conductor, even less heat is lost.

It's probably best just to rig up a case fan or something else to blow straight over it, that should make the temps come down a bit.




Bs|Archaon

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#9 9 years ago

Aye I'd say either replace the cooler, or if it's a decent sized sink then bodge a different fan onto/near it.




*The.Doctor

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#10 9 years ago

I would just take off the stock fan, and strap a low speed 120mm fan to it with zip ties or something.

My 4870 runs hot as fuck without a fan even with my HR-03GT on it. I tried it without a fan and it was sitting at 70C+ at idle, compared to the 35C it sitting at now with just a low speed 120mm on it.




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