HD7970 max safe gpu voltage?

[levelord]

Can anybody tell me what is the maximum, more or less safe, gpu voltage with stock cooling?
Tried to flash my asus 7970 dc2t with 1.263v vddc, but it is still unstable at 1200mhz

 

[erocker]

It isn't really known to be honest. Your card has a completely different layout from say a reference card. It should be able to handle at least the amount of voltage you are putting into it. Have you checked to see if it is indeed getting 1.263v using GPU-Z or another program?

 

[levelord]

Well, it gets it for sure, at least gpu-z and real temp shows it. In fact, even at this pretty high voltage the gpu and the vrm temps aren't really high - 65 both. So i'm wondering, if it's ok to add some more or it'll bunt

 

[erocker]

Just kind of seems like it's not a good clocker. Perhaps try 1.3v? Just make sure that you don't start smelling anything funny, smoke, strange noises, etc.... and watch those temps. It is also quite possible that the VRM temps aren't actually being read correctly.

 

[cadaveca]

Well, it gets it for sure, at least gpu-z and real temp shows it. In fact, even at this pretty high voltage the gpu and the vrm temps aren't really high - 65 both. So i'm wondering, if it's ok to add some more or it'll bunt

my DCUII TOP card shows voltage adjust in software, but in actuality, it doesn't actually get any voltage boosts, and my card runs 1.092V 24/7( I believe it's broken )

THe GPU should be OK up to 1.30 V or so...boost 7970's get 1.25 V at stock.

 

[levelord]

1.3v is pretty high, but as far as i'm aware, msi lightnings can do even higher on air, but not sure if there some magic used for it. Well, got to try it anyway, may be i'll get 1200 at next step.

my DCUII TOP card shows voltage adjust in software, but in actuality, it doesn't actually get any voltage boosts, and my card runs 1.092V 24/7( I believe it's broken )

THe GPU should be OK up to 1.30 V or so...boost 7970's get 1.25 V at stock.

My stock vddc was 1.175, but after i flashed a matrix 280x bios, it raised up to 1.256, but still glitches at 1200.

 

[cadaveca]

My stock vddc was 1.175, but after i flashed a matrix 280x bios, it raised up to 1.256, but still glitches at 1200.

Yeah, mine shows software 1.175V, but it doesn't get that. These cards have nice built-in measure points that I used to check mine; if you have a multi-meter, then you may want to use it.

1170 MHz is the max 24/7 for many of these GPUs, so if you can do 1170, but no more...it's normal. With the GPUs that I have had, to get more requires boosting over 1.35V, kind of like how a PCU needs a big boost in voltage to go further some times.


And yeah, I run my 7970 Matrix @ 1.35V in BIOS< using the onboard buttons to drop that down to just under 1.28V, and haven't had a single issue yet. I've had my card for nearly a year now...perhaps a bit less. The DCUII TOP is such a disappointing card for me in comparison.


BTW, my Matrix card is just the same, software shows one thing, but hardware gets another(but voltage controls and BIOS mods work, unlike my DCUII). There's something about these ASUS 7970's that has them a bit different than other 7970 cards.

 

[levelord]

I pretty sure they are the same, i mean matrix's and dc2t's. Just some extra non-relevant features and marketing magic.

 

[TheoneandonlyMrK]

Yeah, mine shows software 1.175V, but it doesn't get that. These cards have nice built-in measure points that I used to check mine; if you have a multi-meter, then you may want to use it.

1170 MHz is the max 24/7 for many of these GPUs, so if you can do 1170, but no more...it's normal. With the GPUs that I have had, to get more requires boosting over 1.35V, kind of like how a PCU needs a big boost in voltage to go further some times.


And yeah, I run my 7970 Matrix @ 1.35V in BIOS< using the onboard buttons to drop that down to just under 1.28V, and haven't had a single issue yet. I've had my card for nearly a year now...perhaps a bit less. The DCUII TOP is such a disappointing card for me in comparison.


BTW, my Matrix card is just the same, software shows one thing, but hardware gets another(but voltage controls and BIOS mods work, unlike my DCUII). There's something about these ASUS 7970's that has them a bit different than other 7970 cards.

How high have you managed to clock your matrix at that voltage? And thanks for confirming i wasnt going mad as i have been reflashing my matrix just too be able to get a higher voltage for Oc but its defaults to it so its a pain on boot but ya know how these things go mores more.

 

[buildzoid]

Try using Trixx I know that on my Vapor-X nothing but Trixx 4.6.0 can control voltage and set 1.25V to 1.3V

 

[levelord]

Flashed 1.275 vddc, did some tests, now it work just perfect I'll do some BF4 test just to make sure it really works, but Heaven runs great.
But there's one but as always, look at the temps! I dont buy it, Asus just can't produce things that good. Where's the catch?

 

[cadaveca]

I pretty sure they are the same, i mean matrix's and dc2t's. Just some extra non-relevant features and marketing magic.

Same GPU, but the PCBs are definitely quite different. The MATRIX PCB is at least an inch wider, plus has all the buttons and such. Otherwise...yeah, GPU quality is probably about equal.

How high have you managed to clock your matrix at that voltage? And thanks for confirming i wasnt going mad as i have been reflashing my matrix just too be able to get a higher voltage for Oc but its defaults to it so its a pain on boot but ya know how these things go mores more.

1250 seems to work fine, haven't tried to much more yet.

Flashed 1.275 vddc, did some tests, now it work just perfect I'll do some BF4 test just to make sure it really works, but Heaven runs great.
But there's one but as always, look at the temps! I dont buy it, Asus just can't produce things that good. Where's the catch?

LuLz. Not all the DCUII cards are good, that's the catch. Some are great...some not so much. Luck of the draw for how good of a card you get, it seems.

My Matrix card is great, the DCUII not so much, but they both work fine at stock too, so whatever.

 

[The Mac]

for those of you saying software reports different voltages, thats because it uses the values reported by AMDs ADL library.

The only way to get ADL to change what is reported is to change it in bios.

other than that, you can just watch Vcc, which obviously included Vdroop, but it should rise as you increase Vcore.

 

[buildzoid]

Software reads BS for gpu voltage ever since boost modes are a thing. For example both AB and GPU-z read 1.3v but my multi letter tells me that the voltage is 1.284v. And before Trixx 4.6.0 came out I set 1.25v got a reading of 1.25v using AB and GPU-z but only 1.15v when I used a multi meter. CPU-z voltage readouts are even worse because vendors like asrock report fake voltages that are up to 100mv less than what the CPU is getting fed when using high LLC settings.

 

[levelord]

Did some voltage tests for a couple of days, trying to get stability at 1200mHz.
Even 1.35v doesn't help it. Seems just a bad luck with gpu

 

[EarthDog]

Can anybody tell me what is the maximum, more or less safe, gpu voltage with stock cooling?
Tried to flash my asus 7970 dc2t with 1.263v vddc, but it is still unstable at 1200mhz

Ive put 1.3v+ into aftermarket models with no problems. These cards, ALL that I have reviewed in fact, all started artifacting no matter what voltage, around 1.35v. So I would say 1.3v or so is the max you want for 24/7.

Software reads BS for gpu voltage

Fixed. Has nothing to do with boost.