The RX Vega 64 Owners Thread

Shin1234 · 23 Aug 2017 at 20:28

pmc25 said:
Update: reached 850mV. However temperature isn't really dropping any further.

Either the board / chip has aggressive LLC, or it isn't applying voltage lower than a certain number to states 6 & 7.

At a guess id say it simply stops applying, pascal and vega have what can only be called safeguard chips, they have it built into them that specific settings beyond a certain point are not doable in a safe fashion and it simply stops you from doing it. Like how you can throw tons of volts into vega and vega just goes nope, not doing it, the bios says x so you arnt going beyond x.

pmc25 · 23 Aug 2017 at 20:46

Shin1234 said:
At a guess id say it simply stops applying, pascal and vega have what can only be called safeguard chips, they have it built into them that specific settings beyond a certain point are not doable in a safe fashion and it simply stops you from doing it. Like how you can throw tons of volts into vega and vega just goes nope, not doing it, the bios says x so you arnt going beyond x.

Undervolting isn't going to hurt it though. It may crash the driver, that's all.

HWInfo is reporting GPU core voltage as locked at 1.356V and HBM2 voltage at load (it drops at idle) of around 1.05V. I'm guessing they've mislabeled them, and HBM2 Voltage is actually core voltage. My guess is that WattMan either doesn't apply voltages lower than 1050mV or 1000mV. Difficult to tell as I think modern graphics cards have LLC.

Anyway, at load, HWInfo is showing around 210-220W power consumption.

Wattman will (pretend) to apply any core voltage as low as 800mV (and it's stable there), anything below and it will scrub it back to the last valid value. If they aren't applying lower than 1000mV - 1050mV, then why have it set at 800mV??!?!? So silly.

TonyTurbo78 · 23 Aug 2017 at 21:00

you tried WattTool pmc??

pmc25 · 23 Aug 2017 at 21:00

Update, WattMan is a total joke.

AMD really need to pull themselves together.

It appears that core voltage and HBM voltage are the wrong way round in WattMan!

It makes sense. HBM voltage is supposed not to do anything yet. GPU core reads as 1.356V permanently in HWInfo. However when I change HBM voltage in Wattman, GPU Memory Voltage goes up / down the same amount!

So, folks, if you want to use Wattman (don't!), you need to remember to use HBM voltage to undervolt your GPU core.

They shouldn't have released this latest driver if it was this dysfunctional. Better to just not allow undervolting.

pmc25 · 23 Aug 2017 at 21:00

TonyTurbo78 said:
you tried WattTool pmc??

I will do now.

See above. Solved the riddle. It's a joke ...

Sybra · 23 Aug 2017 at 21:06

quick question, looking for new cpu to go with my new Vega build. Would I lose a lot of gaming performance with a Ryzen 1300-1500x instead of the higher tiers models?

JediFragger · 23 Aug 2017 at 21:11

pmc25 said:
Update, WattMan is a total joke.

It was pretty bad in January/February when I last used it, hard to believe it still is :eek:

Acesbomb · 23 Aug 2017 at 21:11

My card under EK block is peaking @ 35c.
Also it can run stock clocks, 1630 @ 1000mv, down from 1200mv stock.
Causes total system draw to drop from peak of 620w to 460w.

HBM can do 1105mhz, hard crash after that.

Shin1234 · 23 Aug 2017 at 21:17

pmc25 said:
Undervolting isn't going to hurt it though. It may crash the driver, that's all.

HWInfo is reporting GPU core voltage as locked at 1.356V and HBM2 voltage at load (it drops at idle) of around 1.05V. I'm guessing they've mislabeled them, and HBM2 Voltage is actually core voltage. My guess is that WattMan either doesn't apply voltages lower than 1050mV or 1000mV. Difficult to tell as I think modern graphics cards have LLC.

Anyway, at load, HWInfo is showing around 210-220W power consumption.

Wattman will (pretend) to apply any core voltage as low as 800mV (and it's stable there), anything below and it will scrub it back to the last valid value. If they aren't applying lower than 1000mV - 1050mV, then why have it set at 800mV??!?!? So silly.

im not so much on about what will damage it, but every man/women and there dog think that overclocking/undervolting is simple cos the ui says slide this. So nvidia and radeon have gone out of there way to make sure the troops out there arnt blowing there stuff up.

edit, every wo/man thing was a bit ott, but ye know what i mean.

TonyTurbo78 · 23 Aug 2017 at 21:18

Acesbomb said:
My card under EK block is peaking @ 35c.
Also it can run stock clocks, 1630 @ 1000mv, down from 1200mv stock.
Causes total system draw to drop from peak of 620w to 460w.

HBM can do 1105mhz, hard crash after that.

Awesome that, I wont be putting my EK stuff on until the weekend, but 35c under load

Acesbomb · 23 Aug 2017 at 21:25

TonyTurbo78 said:
Awesome that, I wont be putting my EK stuff on until the weekend, but 35c under load

We actually have similar setups, would be interested to see some results from yours, got a 3770k myself.

pmc25 · 23 Aug 2017 at 21:26

I'm now fairly sure that at least via WattMan (and in my case having to use HBM voltage to set GPU voltage) that it is not actually applying GPU core voltages lower than 1000mV. At least certainly not lower than around 970-980mV. It will 'apply' 800mV, but doesn't make any difference to the readings in HWInfo.

Will have to see if WattTool will apply lower voltages. It's rock solid around 1000mV.

Acesbomb · 23 Aug 2017 at 21:29

pmc25 said:
I'm now fairly sure that at least via WattMan (and in my case having to use HBM voltage to set GPU voltage) that it is not actually applying GPU core voltages lower than 1000mV. At least certainly not lower than around 970-980mV. It will 'apply' 800mV, but doesn't make any difference to the readings in HWInfo.

Will have to see if WattTool will apply lower voltages. It's rock solid around 1000mV.

No it does. I had downclocking @ 950mv, less downclocking @ 975mv, no downclocking at 1000mv

pmc25 · 23 Aug 2017 at 21:49

Acesbomb said:
No it does. I had downclocking @ 950mv, less downclocking @ 975mv, no downclocking at 1000mv

The voltage readings don't change after 1000mV though.

Dave2150 · 23 Aug 2017 at 21:53

So, my Sapphire Vega64 Liquid Edition arrived today, ordered on launch day for £638. Missed out on initial stock, though more arrived yesterday and one of them had my name on it

Picture for the roll of honour:

Installed and running:

Firestrike: https://www.3dmark.com/3dm/21739425?

Played a few hours of prey, looped 3dmark a few times, blasted through some GTA5, all running smoothly with no crashes, on Turbo settings in wattman. Very impressed with the performance, is a major step up from my RX580, all silky smooth at 1440P 144Hz freesync :cool:

Noise wise, very happy. The pump is very quiet, can hardly hear it if I stop the radiator fan. Much quieter than the usual pumps in corsair AIO's etc. I may end up replacing the radiator fan with a Noctua though, to match the rest of my case. It's not loud, though is noticeable over the rest of my (very) quiet case fans. Luckily no warranty void stickers on the aluminium shroud, so I can simply disconnect the current fan and install a new one if needed.

The only negative so far is that I feel pressured to replace my Noctua UH12S heatsink with an AIO, so have a better view of the gorgeous backplate

LtMatt · 23 Aug 2017 at 21:57

Dave2150 said:
So, my Sapphire Vega64 Liquid Edition arrived today, ordered on launch day for £638. Missed out on initial stock, though more arrived yesterday and one of them had my name on it

Picture for the roll of honour:

Installed and running:

Firestrike: https://www.3dmark.com/3dm/21739425?

Played a few hours of prey, looped 3dmark a few times, blasted through some GTA5, all running smoothly with no crashes, on Turbo settings in wattman. Very impressed with the performance, is a major step up from my RX580, all silky smooth at 1440P 144Hz freesync

Noise wise, very happy. The pump is very quiet, can hardly hear it if I stop the radiator fan. Much quieter than the usual pumps in corsair AIO's etc. I may end up replacing the radiator fan with a Noctua though, to match the rest of my case. It's not loud, though is noticeable over the rest of my (very) quiet case fans. Luckily no warranty void stickers on the aluminium shroud, so I can simply disconnect the current fan and install a new one if needed.

The only negative so far is that I feel pressured to replace my Noctua UH12S heatsink with an AIO, so have a better view of the gorgeous backplate

Nice!

LoadsaMoney · 23 Aug 2017 at 22:05

Man those AIOs look sexy

Acesbomb · 23 Aug 2017 at 22:11

pmc25 said:
The voltage readings don't change after 1000mV though.

Sorry misread, dont use hwinfo.

Btw live stream on undervolting https://www.youtube.com/watch?v=0fc1wti2EG8

Wattman seems to be working with new drivers.

Acesbomb · 23 Aug 2017 at 22:27

Anyone else notice hugely diminishing returns past core of 5%+ or 1712mhz?

AmateurExpert · 23 Aug 2017 at 22:35

TonyTurbo78 said:
Awesome that, I wont be putting my EK stuff on until the weekend, but 35c under load

Seems rather low - watching GN's livestream at the moment, and they're seeing similarly optimistic load temps; they get below ambient readings at idle, so not sure if the raw sensor value is having the right formula applied.