VRM temps

[Jodomcfrodo]

Hey LTT,

I remember making a thread about this a while ago, but can't seem to find it in my history, so I've assumed that I posted it somewhere else, or no where at all. If I have posted this before, I apologize. Since I still don't know the answer and I think I posted the question somewhere else, I'm hoping you guys can help. (I couldn't find a better way to word that, sorry.)

But now to my question. When adding voltage to a GPU, is there anything to worry about besides VRM and GPU temperature? Also what temperature is safe for GPU VRMs? I'm asking this because I want to go farther on my overclock but am worried about putting more than 1.3v through my GPU. When I have 1.3v going through my GPU, the VRMs reach about 50c and the GPU reaches about 40c. This is also with a 130% power limit. Would there be any chance of breaking my GPU if I went to 1.4 or even 1.5v?

Thanks!

[TheRagingGamer]

don worry it can handle 50 no problem even 60 70 80 

[Jodomcfrodo]

don worry it can handle 50 no problem even 60 70 80 mine goes over 95

Should I be worried about anything else besides temperatures while overvolting? Could anything break from too much voltage even if it is adequately cooled?

[Raudi_]

Hey LTT,

I remember making a thread about this a while ago, but can't seem to find it in my history, so I've assumed that I posted it somewhere else, or no where at all. If I have posted this before, I apologize. Since I still don't know the answer and I think I posted the question somewhere else, I'm hoping you guys can help. (I couldn't find a better way to word that, sorry.)

But now to my question. When adding voltage to a GPU, is there anything to worry about besides VRM and GPU temperature? Also what temperature is safe for GPU VRMs? I'm asking this because I want to go farther on my overclock but am worried about putting more than 1.3v through my GPU. When I have 1.3v going through my GPU, the VRMs reach about 50c and the GPU reaches about 40c. This is also with a 130% power limit. Would there be any chance of breaking my GPU if I went to 1.4 or even 1.5v?

Thanks!

Your GPU can only handle a Voltage to a certain point with it starting to damage the card permanently.I mean I have 1.35V and 450W going through my GTX 770 and its on air but I max out around 77-80C in games or benching. But I suggest you hope over to the 780ti owners club on overclock.net to get some more help on the issue.

[Jodomcfrodo]

Your GPU can only handle a Voltage to a certain point with it starting to damage the card permanently.I mean I have 1.35V and 450W going through my GTX 770 and its on air but I max out around 77-80C in games or benching. But I suggest you hope over to the 780ti owners club on overclock.net to get some more help on the issue.

1.35v on air and 80c? Wow that's impressive. Would you happen to know why it would do damage if temperature is fine? The bios I have allows 1.5v.

I'll be sure to hop over there and ask. Maybe that's where I asked before. I'll check.

Thanks!

[Raudi_]

1.35v on air and 80c? Wow that's impressive. Would you happen to know why it would do damage if temperature is fine? The bios I have allows 1.5v.

I'll be sure to hop over there and ask. Maybe that's where I asked before. I'll check.

Thanks!

Because the voltage regulator will actually start burning out at such a high voltage, and it starts to degrade quicker (just like mining does to AMD gpu's).

Thank you my GTX 770 is my best overclocking card I have owned to date.

[Jodomcfrodo]

Because the voltage regulator will actually start burning out at such a high voltage, and it starts to degrade quicker (just like mining does to AMD gpu's).

Thank you my GTX 770 is my best overclocking card I have owned to date.

My card hit 82c at stock and 1150mhz. What clock do you boost to on stock?

[Raudi_]

My card hit 82c at stock and 1150mhz. What clock do you boost to on stock?

My GTX 770 stock speeds boost to 1245mhz but overclocked I boost to 1780mhz and hit 78C (Average) (Note I have 2 Noctua NF-P12's running fresh cold air to it also)

[Face2Face]

 I have 1.35V and 450W going through my GTX 770 and its on air 

?? 450w... how did you come up with that?

[Raudi_]

?? 450w... how did you come up with that?

Modded my GPU's Bios and changed the TDP (Kepler BIOS Tweaker)

[Face2Face]

My GTX 770 stock speeds boost to 1245mhz but overclocked I boost to 1780mhz and hit 78C (Average) (Note I have 2 Noctua NF-P12's running fresh cold air to it also)

1780Mhz??  World record on air over here?  How do you measure your power draw and boost core clock..

[Face2Face]

Modded my GPU's Bios and changed the TDP (Kepler BIOS Tweaker)

Just because you used Kepler bios tweaker and change the TDP threshold doesn't mean your card is using 450watts...

[Lays]

@VSG can help with this hopefully. He can explain better than I do, also about the 450w gtx 770 thing, your air cooler can't keep up with 450w of tdp, thats waterblock+ln2 territory. 

 

My 780's at 1.325v barely managed to hit around the 350w range per card.

[Raudi_]

GPU-Z and you can't really measure Power-draw straight from the GPU itself but my total system Power draw is 650W+ and that is due to my GPU, (Plus its not a world record if its a Boost speed, in my book)

[Face2Face]

GPU-Z and you can't really measure Power-draw straight from the GPU itself but my total system Power draw is 650W+ and that is due to my GPU, (Plus its not a world record if its a Boost speed, in my book)

 

How are you measuring your power draw? 650 Watts from an air cooled GTX 770 and a overclocked 4770K ... I'm not buying it.   Also, you must have messed up your bios, because you are not hitting a boost clock of 1700Mhz. Not trying to be a dick.

[Lays]

How are you measuring your power draw? 650 Watts from an air cooled GTX 770 and a overclocked 4770K ... I'm not buying it.   Also, you must have messed up your bios, because you are not hitting a boost clock of 1700Mhz. Not trying to be a dick.

 

 

If he hit 450w on his 770 at 1.35v, that must of meant my 1.325v on my 780's pulling 350 was actually 700 watts per card! lel.

[Face2Face]

 

 

My 780's at 1.325v barely managed to hit around the 350w range per card.

 

Exactly. I have pulled around 500 watts from my Lightning alone @ 1.5v @ 1529Mhz on the core. That was measured from my entire system consumption with a Killawatt meter from the wall and then applied PSU efficiency. The power draw would have been lower if I could have kept my card colder, but I would only image 50-65 watts at the most.

[Lays]

Exactly. I have pulled around 500 watts from my Lightning alone @ 1.5v @ 1529Mhz on the core. That was measured with a Killawatt meter from the wall and then applied PSU efficiency. The power draw would have been lower if I could have kept my card colder, but I would only image 50-65 watts at the most.

 

 

I didn't measure mine with a kill-a-watt, I went around checking all the bios mod threads on OCN and other places, and looked at what others kill-a-watt readings were for their titans/780's, and did my best to guesstimate. 

 

I also figured that since my PSU fan actually turned on for once when I was benching them with a 5ghz 3930k that my calculations were pretty dam close lol (my PSU is 100% passive until it hits 45c, regardless of load)

First time I've ever actually seen it turn on lol

[Jodomcfrodo]

My GTX 770 stock speeds boost to 1245mhz but overclocked I boost to 1780mhz and hit 78C (Average) (Note I have 2 Noctua NF-P12's running fresh cold air to it also)

1780 MHz... Could you post some screenshots of that working please? No way your card only hits 78c with 1.35v while running at 1780 on air. I can't believe that for a second.

[VSG]

lol what's going on in here?

 

OP: You will be fine till 1.4V when benching with the 780 Ti Classified under water. I would stick to 1.35V max for 24/7. Also note that the set voltage will actually be lower than applied voltage due to LLC and the board's power distribution. So you need to have a DMM to be sure of the volts applied.

[Face2Face]

I think you'll find that most places on the web state that 120c is the limit for your VRM temp. I think this all came to be with the 5970 VRM temp debacle when GPU editor Ryan Smith @ AnandTech had found out his 5970 was throttling while overclocking due the VRMs temps reaching in upwards of 120c. Most GK110 cards do not have a way to measure VRM temps via software. The Classified, Lighting, HOF and couple of Asus cards can to my knowledge. On cards like the Classified and Lightning, it's take quite a bit of GPU voltage for the VRM to get hot. Each GPU has 14 or 16 power phases to utilize and having that many really helps to dissipate heat from the mosfets/drivers.There may be a voltage hump you might need to hurdle, so increasing your voltage past 1.35v to 1.4v-1.45v for 35-75Mhz on the core is not worth the 1-2 FPS difference in games. For quick benching, I have been up to 1.5v monitored by software, which is never accurate.  I don't even want to know what a multi-meter might say.... 1.55-1.6v probably.