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Old 08-04-08, 05:42 PM   #1
particleman
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Default 780a Hybrid SLi 280 GTX heat problem in power save mode

So I dumped my 4870 Crossfire setup in hopes that with a nForce 780a (Asus M3N-HT Deluxe) and 2 x 280 GTXs, I could turn off my cards to save power and more importantly generate less heat when just web browsing. The problem problem that I am having is that when I switch the Hybrid SLi setup to save power it should completely shutoff my 2 280 GTXes. When I switch it to save power the fans on my 280s shutoff completely (which I would expect if the card is going to completely shutoff), but the cards continue to heat up in save power mode. It gets to the point where they get almost too hot to touch (I turn it back to performance mode before I let it get any hotter). Why do the cards continue to generate so much heat if they are supposed to be completely shuttoff? This is a pretty serious issue because if you leave your Hybrid SLi setup on save power you could fry your cards!

Anyone else have a Hybrid SLi setup, and have you noticed the same thing.
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Old 08-04-08, 05:56 PM   #2
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Default Re: 780a Hybrid SLi 280 GTX heat problem in power save mode

Wow, that's about as nasty of a bug as Hybrid Power could have.

Hopefully its a quick fix. I thought Hybrid Power was a pretty awesome idea.
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Old 08-05-08, 12:44 AM   #3
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Default Re: 780a Hybrid SLi 280 GTX heat problem in power save mode

After running some benchmarks I can also say that Hybrid SLi does not work very well with 2 280 GTX's. When running two 280 GTXs through the onboard HDMI the performance is similar to that of a single 280 GTX.

Hybrid SLi has been a major letdown, none of it's features work as advertised for the high end user. Maybe it works in performance boost for something like a 8500 discreet GPU. But for those looking to save power/reduce heat on a high end configuration, it just plain doesn't work.
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Old 08-05-08, 01:09 AM   #4
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Default Re: 780a Hybrid SLi 280 GTX heat problem in power save mode

Isn't there a setting for "hybrid power"?

I thought Hybrid SLI and Hybrid Power were actually two separate things you had to enable. Hybrid SLI can give a performance boost on slower cards but I don't think it was ever intended to make a high end system faster.

Hybrid Power is used to save power, and I swear more than one review I've read has said that it is a separate option to enable and isn't a part of Hybrid SLI.
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Old 08-05-08, 08:04 AM   #5
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Default Re: 780a Hybrid SLi 280 GTX heat problem in power save mode

Yep, there are 3 modes "save power" = hybrid power, "boost performance" which on high end cards should basically be passthru, and "additional displays". The "save power" (hybrid power mode) is supposed to turn off the cards. I've run GPUZ coming out of "save power" mode and the temperature is definitely much higher than idling in "boost performance" mode, I've seen the temperatures in the 80's coming out of hybrid power. It is probably even higher but it takes a few seconds to start up GPUZ after turning it back to "boost performance" and you can't run GPUZ on the cards when they are in hybrid power. So I suspect if I let the cards stay in Hybrid power longer the temperatures would go into the 100's.

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Originally Posted by CaptNKILL View Post
Isn't there a setting for "hybrid power"?

I thought Hybrid SLI and Hybrid Power were actually two separate things you had to enable. Hybrid SLI can give a performance boost on slower cards but I don't think it was ever intended to make a high end system faster.

Hybrid Power is used to save power, and I swear more than one review I've read has said that it is a separate option to enable and isn't a part of Hybrid SLI.
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Old 08-05-08, 10:00 AM   #6
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Default Re: 780a Hybrid SLi 280 GTX heat problem in power save mode

I just noticed that nVidia has a list of certified power supplies for Hybrid SLi.
http://www.nvidia.com/object/geforce...wr_supply.html
I have a PC Power and Cooling 750W Quad SLi power supply but it doesn't show up on the list. I wonder those PSUs have something special required for Hybrid Power to function properly. But a Power Supply is a Power Supply isn't it? If there was something to stop it from feeding power, some signal would have to come thru to the PS, but the 780A has no extra connectors than a standard motherboard and the 280GTX only has the standard 6 and 8 pin connectors.
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Old 08-23-08, 02:03 PM   #7
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Default Re: 780a Hybrid SLi 280 GTX heat problem in power save mode

After looking around the web it looks like I am not the only one getting next to no power savings with Hybrid Power and the 2XX series GPUs. In Silent PC's review of the Asus M3N78 Pro they tested Hybrid Power and saved only 5W when idle. With one 260 GTX they achieved 75W idle when in save power mode. With just the onboard graphics they achieved 38W idle.

"Unfortunately, HybridPower doesn't come even close to shutting down the card's power demand entirely. In the Save Power mode, power consumption decreased the most during video playback, 11-17W, but only 5W idle, and only 3W when the CPU was put on load. We did notice the card's cooling fan turning off when Save Power mode was activated, but the card remained fairly warm. It's evident that the card was still drawing a fair amount of power, but not so much that the card would overheat without the fan spinning."

http://www.silentpcreview.com/article853-page6.html

It's like Hybrid Power is completely broken with the 2XX series GPUs, I think most of those measly 5W saved is from the fan being shutoff.
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Old 08-23-08, 03:51 PM   #8
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Default Re: 780a Hybrid SLi 280 GTX heat problem in power save mode

You want to save power?

Get an Abacus.
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Old 08-23-08, 04:24 PM   #9
particleman
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Default Re: 780a Hybrid SLi 280 GTX heat problem in power save mode

I'm more concerned about heat, and not turning my computer into a furnace, but yes I do find it stupid the amount of energy wasted just needlessly wasted when just web browsing or idling on the desktop.

And given that nVidia has advertised this feature they obviously think that a lot of other people out there see it as desirable as well.
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