PSU requirements for dual gpu.

[FireGryph]

What sort of PSU wattage would be recomended for running a pair of GPU's? In this case, a 5700xt and an R7 370. Just a ballpark estimate is all Im looking for.

[Bad 💀 Motha]

Just run a single 5700 XT
You can't pair those two together in any way, except seperately, which would be pointless.

[Andrius227]

Publicado originalmente por Bad 💀 Motha:

Just run a single 5700 XT
You can't pair those two together in any way, except seperately, which would be pointless.

He could use it for second monitor. For youtube etc.

[FireGryph]

Publicado originalmente por Andrius227:

Publicado originalmente por Bad 💀 Motha:

Just run a single 5700 XT
You can't pair those two together in any way, except seperately, which would be pointless.

He could use it for second monitor. For youtube etc.

Exactly this.

My reasons for running two arent the topic. The topic is what kind of PSU wattage would be needed or recommended.

[Bad 💀 Motha]

Publicado originalmente por Andrius227:

Publicado originalmente por Bad 💀 Motha:

Just run a single 5700 XT
You can't pair those two together in any way, except seperately, which would be pointless.

He could use it for second monitor. For youtube etc.

Total waste of a gpu when something like a 5700 is more then capable of driving 3 to 4 screens without issues.

[Nabster]

750w would be fine, 850w if you want a bit of headroom

[Bad 💀 Motha]

Yes, a decent quality brand that is gold certified and Modular would be good. 750w or 850w just ensure has all the required PCIE GPU connections (6+2 pin)

[r.linder]

Publicado originalmente por Bad 💀 Motha:

Publicado originalmente por Andrius227:

He could use it for second monitor. For youtube etc.

Total waste of a gpu when something like a 5700 is more then capable of driving 3 to 4 screens without issues.

This.

You don't need to run a second GPU to run dual monitor, I run dual monitor with my 5700 XT and there's no problems or performance loss, and it's a much better idea than running the 5700 XT AND the R7 370 because the latter is just a huge waste of power, and here's why:
The 5700 XT performs 400% better than the R7 370 while being considerably more power efficient; the 5700 XT uses only around 40 to 50 watts more on average while performing 4x better, and the difference while using an extra display is extremely minimal. Take it from me, I run dual monitors with high refresh rates on a 5700 XT. There's nothing to lose by doing that, but you're just wasting power by throwing in the 370, and wasting your money by having to spend a bit more on a PSU when a decent 650W is more than enough for current single GPU configurations.

To answer the topic, though: you're going to want at least a 750W PSU, because AMD's recommendation for a system with a single 5700XT is 600W, and you're adding a GPU that can use an additional 170W, so 750W is the safe bet, but you also need to ensure that the PSU has the required cables for both cards.

[FireGryph]

Thank you all for the quick replies!


The full story is this:
Ive got the 5700xt as my primary, and two displays. One is a 32" 1440p 144hz, and the other is a 27" 1080 144hz. If I run them both on the 5700xt, the memory clocks are stuck at max all the time, never downclock even at idle. This increases temps by 10c and power draw. Also, the 32" is HDR, and HDR wont run properly (in Doom Eternal at least) if i have both monitors connected.

I ended up grabbing a cheap nvidia GT 710 to test a theory i had seen elsewhere, and it works. Mostly. I can run both monitors at 120hz and HDR was working in doom. Not full 144hz, though, but 120 is decent and better than 60.

Ive heard of some people solving the locked mem clocks by using CRU, but I could never get it to work for me.

Now Id rather run just AMD cards and thus just the radeon control panel rather than both. Locally there are a few cheap radeon carss on the used market.


So Im weighing my options. What serves me best in terms of performance, bug squashing, efficiency, temps, power draw. I could just deal with the locked mem clocks and run everything off the 5700xt, yes. But i alao like the card to downclock properly. The lower 5700xt temps and power draw by downclocking may be very well easily offset by the added power draw and heay generation of the secondary card anyways, though.


At the end of the day, i enjoy tinkering and trying sifferent setups, experimenting, so long as i dont break my system entirely or break my bank account. Im just seeking the optimal setup for my personal situation and preferences.

[Lord Flashheart]

Publicado originalmente por FireGryph:

What sort of PSU wattage would be recomended for running a pair of GPU's? In this case, a 5700xt and an R7 370. Just a ballpark estimate is all Im looking for.

I use 850W, specifically this https://www.antec.com/product/power/hcg-gold850.php

My main card is a gtx 1080 ti.
The second one is my old GTX 970 for CUDA based stuff.

[r.linder]

Publicado originalmente por FireGryph:

Thank you all for the quick replies!


The full story is this:
Ive got the 5700xt as my primary, and two displays. One is a 32" 1440p 144hz, and the other is a 27" 1080 144hz. If I run them both on the 5700xt, the memory clocks are stuck at max all the time, never downclock even at idle. This increases temps by 10c and power draw. Also, the 32" is HDR, and HDR wont run properly (in Doom Eternal at least) if i have both monitors connected.

I ended up grabbing a cheap nvidia GT 710 to test a theory i had seen elsewhere, and it works. Mostly. I can run both monitors at 120hz and HDR was working in doom. Not full 144hz, though, but 120 is decent and better than 60.

Ive heard of some people solving the locked mem clocks by using CRU, but I could never get it to work for me.

Now Id rather run just AMD cards and thus just the radeon control panel rather than both. Locally there are a few cheap radeon carss on the used market.


So Im weighing my options. What serves me best in terms of performance, bug squashing, efficiency, temps, power draw. I could just deal with the locked mem clocks and run everything off the 5700xt, yes. But i alao like the card to downclock properly. The lower 5700xt temps and power draw by downclocking may be very well easily offset by the added power draw and heay generation of the secondary card anyways, though.


At the end of the day, i enjoy tinkering and trying sifferent setups, experimenting, so long as i dont break my system entirely or break my bank account. Im just seeking the optimal setup for my personal situation and preferences.

10 degrees is really nothing unless you're using a garbage model like the original XFX THICC or reference style model. My AORUS model always stays below 100 C on the hotspot, so there's no problem. Fan curve is locked to never go above 75% fan speed, but 75% only triggers when the hotspot reaches 100.

Power draw is also moot, because the R7 370 uses 170 watts at full load easily. That's considerably more wasteful.

[Missing Spartan]

Publicado originalmente por Bad 💀 Motha:

Just run a single 5700 XT
You can't pair those two together in any way, except seperately, which would be pointless.

you could pair them together in Ashs of the Singularity.

[FireGryph]

Publicado originalmente por Escorve:

10 degrees is really nothing unless you're using a garbage model like the original XFX THICC or reference style model. My AORUS model always stays below 100 C on the hotspot, so there's no problem. Fan curve is locked to never go above 75% fan speed, but 75% only triggers when the hotspot reaches 100.

Power draw is also moot, because the R7 370 uses 170 watts at full load easily. That's considerably more wasteful.

Im using the reference AMD card, the blower one. The only tuning ive done is to raise max fan speed from 40% to 60%, and this keeps the temps at hotspot below 100C during load.

But its idle temps that bother me. The extra 10C is put into my room, which is great in the winter but not so great during the summer months.
However, as I mentioned, I dont know how the extra card in the system affects this situation. Im no expert on thermodynamics and power, and I dont know if the room temperature is higher or lower based on these cards or the temps of the cards.
None of this speaks to the issue I have with Doom Eternals HDR, either. Works with dual cards, doesnt work with a single.

I would love to just get a cheap low power, low profile AMD card, but they aren't exactly easy to come by or cheap. The only reason Im considering the R7 is because it is available for cheap, and runs on the same driver package as the 5700xt, unlike my spare HD 7570.

[Cave Yeti Supreme]

I sort of understand why you'd maybe want to do that, but honestly this issue is OS/driver support stupidity that shouldn't be an issue. There's multi-monitor weirdness on Linux too, this stuff shouldn't be a problem when you're buying $400+ products.

The solution should be AMD cutting off a fat slice of dat Ryzen cash and investing it in their software division and getting this kind of crap under control. Short-term there may be people stupid enough to buy two cards to run two monitors for twice the price without any tangible benefit, but long-term this ♥♥♥♥ just feeds into the "AMD licks windows, nvidia just works" trope

Edit: Most discrete GPU's, even in laptops, idle somewhere above 5 watts, if not north of 15. You're gonna have additional heat production either way, the question is how much, and how much is money worth to you?

[Washell]

Publicado originalmente por FireGryph:

The extra 10C is put into my room

It's not 10°C. It's, say, an extra hundred Watt(*) that's being put into your room when it doesn't downclock. An old school lightbulb. If you bought a 100 Watt spaceheater, you'd feel scammed.

* Massive overestimate.

[FireGryph]

Publicado originalmente por Washell:

Publicado originalmente por FireGryph:

The extra 10C is put into my room

It's not 10°C. It's, say, an extra hundred Watt(*) that's being put into your room when it doesn't downclock. An old school lightbulb. If you bought a 100 Watt spaceheater, you'd feel scammed.

* Massive overestimate.

Fair point. Its not simply raising my room 10C, though it is still generating heat. It certainly feels noticable, but that could entirely be in my head.