ASUS GTX780Ti DC2OC _ VRM are Very Very HoT!

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1stcowgirl

Junior Member
Oct 13, 2012
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im trying to look around and find an answer about the card VRM, they get 90c up to 100c on load.

iv seen users with the same temps on VRM but could not find any reasonable Answer.
so, anyone know whats with those crazy temps?
is it safe?
 
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blackened23

Diamond Member
Jul 26, 2011
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How are you measuring VRM temps since GPU-z and no other utility does it with the 780ti. Interesting. In any case, 100C is well within specs for the VRM area, the tjmax is around 120-125C on most cards from what I've read.
 
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Silverforce11

Lifer
Feb 19, 2009
10,457
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Guru3d does thermal imaging, which is generally less than the direct temps. From reading their reviews, 780ti from various brands have a range of 80-90C in gaming load. If your case is poorly ventilated or you live in a hotter climate with higher ambients, sure, it could hit 100C. Sadly, most NV cards lack VRM sensors so users wont know about it.

But the fact is, most users (especially for AMD) cards see 80+ VRM temps and go "Hmmm, that's a bit high!!" but mosfets work fine to up to 115C (the limit is 125C for most types) and some special high quality mosfets can handle 150C.

Edit: Have to add, while they can work at 115C its not recommended because they lose a lot of efficiency over 90C and at 115C their conversion efficiency is horrible.
 
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blackened23

Diamond Member
Jul 26, 2011
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1stcowgirl said:
sorry im from my phone, but please take a look:

https://forums.geforce.com/default/topic/719526/asus-gtx780ti-oc-strange-vrm-spikes-/
Click to expand...

If that's you, you stated that GPU-Z picks up VRM spikes. That's impossible from what I remember, unless GPU-Z suddenly gained the ability to check VRM temps on the 780ti cards. Perhaps the Asus card has sensors. I don't know.

In any case, it isn't a problem, if it were, you'd get artifacts and crashes in game. So the obvious question here is, do your games work. If you don't know, then do your normal thing, if everything works - then you are good to go. You are within temperature limits, well within them even at 100C. But if you're OCD about VRM temps for whatever reason and the card works, you always have the option to exercise the 30 day return window. So do that if you're OCD about it. Or increase chassis air flow. The most important thing is whether your games crash or work, that's how you tell if VRM temps are an issue.
 
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1stcowgirl

Junior Member
Oct 13, 2012
18
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Silverforce11 said:
Guru3d does thermal imaging, which is generally less than the direct temps. From reading their reviews, 780ti from various brands have a range of 80-90C in gaming load. If your case is poorly ventilated or you live in a hotter climate with higher ambients, sure, it could hit 100C. Sadly, most NV cards lack VRM sensors so users wont know about it.

But the fact is, most users (especially for AMD) cards see 80+ VRM temps and go "Hmmm, that's a bit high!!" but mosfets work fine to up to 115C (the limit is 125C for most types) and some special high quality mosfets can handle 150C.
Click to expand...

Thank you.
i do have a desert climate.
so it may be that the card was built with a special design to endure such temps?
 
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1stcowgirl

Junior Member
Oct 13, 2012
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if any of you would had to choose between Asus GTX780TI-DC2OC or MSI GTX 780Ti GAMING
Which one would you go for?
 
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blackened23

Diamond Member
Jul 26, 2011
8,548
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I'd go with the one on sale at the time. I've seen the gamer on sale at various points and time, and the asus at others. They're both fast and they're both quiet. Overclocking wise? On paper the asus has an edge but that isn't a guarantee. Noise wise MSI has an edge but they're both quiet anyway so.

I'd get the cheaper one with the better warranty situation in your country. There's a lot of hubub about asus RMA's and I haven't really had an issue, and i'm a big fan of asus stuff. But the MSI is a good card as well, certainly.
 
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Ed1

Senior member
Jan 8, 2001
453
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1stcowgirl said:
if any of you would had to choose between Asus GTX780TI-DC2OC or MSI GTX 780Ti GAMING
Which one would you go for?
Click to expand...

They both use a dual fan HS and improved VRM's . I don't think there be much difference for same clocks speeds .

What I would do is not focus on BM temps, as they will go generally higher than real games, app .
See what temps you get with in games, real usage .

Also what I would do regardless is install MSI AB and set up a fan profile , this should lower your temps at least 5 -10c maybe more as long as your case airflow is good .

http://www.guru3d.com/articles_pages/asus_directcu_geforce_gtx_780_ti_oc_review,9.html

http://www.guru3d.com/articles_pages/msi_geforce_gtx_780_ti_gaming_review,9.html

You can see here the VRM are like 9c hotter than the MSI , I wonder if backing plate is hurting here a little .
again I would test with modified fan profile , I am sure it will bring temps down w/o making it to loud .
 
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1stcowgirl

Junior Member
Oct 13, 2012
18
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1428747651.png
 
bleucharm28

bleucharm28

Senior member
Sep 27, 2008
494
1
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not really related to your topic. But with the heat coming out of these cards nowadays. I really like open bench tables instead of formal ATX PC case. But...that's just me.
 
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Headfoot

Diamond Member
Feb 28, 2008
4,444
641
126
I'd get the MSI because ASUS's customer service has been absolute garbage on every occasion I've had the displeasure of dealing with it
 
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lavaheadache

Diamond Member
Jan 28, 2005
6,893
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The problem with the Asus DCu II cards is that there is no heatsink on one set of the vrms. The 290x's are the same way. It is very easy to remedy the problem though if you have a low profile memory heatsink laying around and some thermal pads. I did it to mine and temps dropped on the culprit vrms by over 20c. Idiotic move on Asus' part if you ask me.






hmm, after closer inspection of the 780 cards it appears that all the vrms are under that lone heatsink. Maybe they are just putting off too much heat for the little thing
 
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Fastx

Fastx

Senior member
Dec 18, 2008
780
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Silverforce11 said:
o_O
Stock clocks and its that hot, terrible card or crap case?
Click to expand...


I was surprised at stock clock could be a little of both case/cooler. But imo the MSI cooler on a 290 is not one of the better coolers/ for overclocking imo.

Stock
http://forums.overclockers.co.uk/showpost.php?p=25673051&postcount=285

Stock
http://forums.overclockers.co.uk/showpost.php?p=25764746&postcount=404

Stock
http://forums.overclockers.co.uk/showpost.php?p=25766213&postcount=405

Overclocked - 1200
http://www.overclock.net/t/1453703/vr-zone-msi-launches-r9-290-and-r9-290x-gaming-4g-video-cards/30
 
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Ed1

Senior member
Jan 8, 2001
453
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81
bononos said:
It appears that the vrm temp is actually lower according to Asus in a thread the OP opened on the Asus forum.
http://rog.asus.com/forum/showthread.php?46389-ASUS-GTX780Ti-DC2OC-_-VRM-are-Very-Very-HoT!
"So I found out it's actually not running that hot, it's a wrong sensor reading that will be fixed in an upcoming GPU Tweak release."
Click to expand...

That's were IR temp guns come in handy as long as you can see, get straight shot you get good results .Even if you can't you can get rough idea from back of card .
 
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Face2Face

Diamond Member
Jun 6, 2001
4,100
215
106
lavaheadache said:
The problem with the Asus DCu II cards is that there is no heatsink on one set of the vrms. The 290x's are the same way. It is very easy to remedy the problem though if you have a low profile memory heatsink laying around and some thermal pads. I did it to mine and temps dropped on the culprit vrms by over 20c. Idiotic move on Asus' part if you ask me.

hmm, after closer inspection of the 780 cards it appears that all the vrms are under that lone heatsink. Maybe they are just putting off too much heat for the little thing
Click to expand...

The GTX 780 Ti appears to only have a vrm on the right side of the card.
8 GPU phases and 2 VRAM phases. Looks like they use three drivers/mosfets for each phase, I would think it would do a better job at dissipating the heat because of increased surface area?

ASUS-GTX780TI-DC2OC-3GD5-DirectCU-II-OC-GeForce-GTX-780-Ti-3GB-GDDR5-(90YV05A0-M0NA00)-PCB.jpg



06_asus_gtx780ti-dc2oc-3gd5.jpg


The VRM heatsink also looks pretty stout. Maybe the screws that hold it down need to be tightened :\ At a loss... Fans spin to slow to effective cool the vrm?

Fastx said:
The Asus 780ti has vrm temp sensors.
Click to expand...

Nice to know. I didn't realizee that Asus Ti's have vrm temp sensors. I wonder if the Asus GTX 780's do? My card has them and I think the Evga Classified too? Maybe Gus could chime in and let us know.
 
Fastx

Fastx

Senior member
Dec 18, 2008
780
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0
bononos said:
It appears that the vrm temp is actually lower according to Asus in a thread the OP opened on the Asus forum.
http://rog.asus.com/forum/showthread.php?46389-ASUS-GTX780Ti-DC2OC-_-VRM-are-Very-Very-HoT!
"So I found out it's actually not running that hot, it's a wrong sensor reading that will be fixed in an upcoming GPU Tweak release."
Click to expand...

At M1 the VRM area can be spotted, it runs almost 100 Degrees C, this is a fairly high temperature. Make sure you have plenty airflow inside your chassis as that will definitely help.
Click to expand...

http://www.guru3d.com/articles_pages/asus_directcu_geforce_gtx_780_ti_oc_review,9.html
 
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