VULKAN DUAL GPU support planned??

[Gunslinger52]

Hi ED,

Just wondered if this was something planned for the future.  Might be a nice way of letting people reuse older tech for longer. 

Cheers

'52

[SkateZilla]

Vulkan Dual GPU is not the same as Crossfire or SLi.

[MAXsenna]

Vulkan Dual GPU is not the same as Crossfire or SLi.

Care to elaborate? Serious question because I know you know your stuff. Do you think it's possible that we could potentially benefit from multi GPU support in DCS with Vulkan? I'm thinking primarily for multi screens.
Cheers!

Sent from my SM-A536B using Tapatalk

[Hiob]

Yes that would interest me too. I still have my „old“ GPU here, if there was a way to profit from it (even if it’s just theoretical right now), I‘d love to hear about.

[SkateZilla]

Trying to use Explicit MGPU in Vulkan w/ an older GPU will not yield the benefits you think it will.

- The Driver for that GPU Needs to Still Support the Version of Vulkan you are running on, I don't know about you, but my "old" GPUs are in long term support, and their last set of drivers still haven't added any recent Vulkan capability, AMD's Legacy Drivers for anything Pre RX 5xxx would not work correctly, if at all.

- Mixed Explicit MGPU also does not directly share data, So if you run a AMD RX6900XT and a RTX 3080, then Vulkan MGPU will not put them in the same group, and thus, for every function requires a trip through the CPU to process and convert data, which causes latency and performance issues. Same for if you are Running a RX6900XT and a RX6800XT, if the GPUs do not Explicitly match, don't bother trying.

[Hiob]

7 minutes ago, SkateZilla said:

Trying to use Explicit MGPU in Vulkan w/ an older GPU will not yield the benefits you think it will.

- The Driver for that GPU Needs to Still Support the Version of Vulkan you are running on, I don't know about you, but my "old" GPUs are in long term support, and their last set of drivers still haven't added any recent Vulkan capability, AMD's Legacy Drivers for anything Pre RX 5xxx would not work correctly, if at all.

- Mixed Explicit MGPU also does not directly share data, So if you run a AMD RX6900XT and a RTX 3080, then Vulkan MGPU will not put them in the same group, and thus, for every function requires a trip through the CPU to process and convert data, which causes latency and performance issues. Same for if you are Running a RX6900XT and a RX6800XT, if the GPUs do not Explicitly match, don't bother trying.

what about a 3080 with a 4090?

[TKhaos]

4 minutes ago, Hiob said:

what about a 3080 with a 4090?

Would need a 3080 +3080 or a 4090 + 4090 as matched pairs.

[SharpeXB]

2 hours ago, TKhaos said:

4090 + 4090 as matched pairs.

[SkateZilla]

8 hours ago, TKhaos said:

Would need a 3080 +3080 or a 4090 + 4090 as matched pairs.

and a nuclear reactor for power and a contained section of vacuum sub space to extract the heat to.

[Hiob]

9 minutes ago, SkateZilla said:

and a nuclear reactor for power and a contained section of vacuum sub space to extract the heat to.

Actually it's a misconception that the 4090 is very energy hungry. Sure there are freak versions that apply 600W to get 3% more fps (which is insane and far beyond the peak of the efficieny curve). But in reality my 4090 (in DCS that is ) uses the exact same 300-330W my previous 3080 did, except it delivers roughly two times the performance.
 

(strictly talking "relative" here. Absolutely, the energy consumption of a high-end gaming PC nowadays is ridicoulous!)

[draconus]

Also how many of you have double PCIex16 slots on your mobo?

[Hiob]

Just now, draconus said:

Also how many of you have double PCIex16 slots on your mobo?

True, even though a X8 slot doesn't limit performance as much as you might expect. (Especially for a card that is only meant to supplement the load)
But to be perfectly clear - I have no idea how this "Vulcan-SLI" is supposed to work..... 

[TKhaos]

4 hours ago, SkateZilla said:

and a nuclear reactor for power and a contained section of vacuum sub space to extract the heat to.

Handy in the winter, heavy gaming I can heat my room up by 2c, has hit 3c sometimes and cheaper than having the heating on and that's with a single AMD card

10 hours ago, SharpeXB said:

Yeah wouldn't see me spending that kind of money on GPU's, could buy a decent secondhand card for that

[Hiob]

Just now, TKhaos said:

Handy in the winter, heavy gaming I can heat my room up by 2c, has hit 3c sometimes and cheaper than having the heating on and that's with a single AMD card

My system produces about 500W of waste heat. That is indeed a quarter of an electric heating oven..... Unfortunately it also does this in the summer...... 

[TKhaos]

7 minutes ago, Hiob said:

My system produces about 500W of waste heat. That is indeed a quarter of an electric heating oven..... Unfortunately it also does this in the summer...... 

There is that down side and have felt it at times in the past, even this week it's been fairly warm in the UK so pushed room temperatures up. Plus in the summer I run different fan curves to keep things cool so that pushes power output up having 7 fans in the system, plus CPU and GPU  

Edited September 20, 2024 by TKhaos

[Hiob]

1 minute ago, TKhaos said:

There is that down side and have felt it at times in the past, even this week it's been fairly warm in the UK so pushed room temperatures up. Plus in the summer I run different fan curves to keep things cool so that pushes power requirements up having 7 fans in the system, plus CPU and GPU  

make that 12 fans and 3 pumps......  Peanuts compared to the CPU/GPU 

[SharpeXB]

Last I had SLI it was with two Pascal series Titans. They spewed out 85c air and indeed could heat up the room. The 4090 I have is actually quite cool. 

[Hiob]

2 minutes ago, SharpeXB said:

Last I had SLI it was with two Pascal series Titans. They spewed out 85c air and indeed could heat up the room. The 4090 I have is actually quite cool. 

The GPU temp is irrelevant for the room temp - only the amount of watts it draws. Lower GPU temp only means the power is transferred to the room more efficiently.

[SharpeXB]

4 minutes ago, Hiob said:

The GPU temp is irrelevant for the room temp - only the amount of watts it draws. Lower GPU temp only means the power is transferred to the room more efficiently.

Sure but looking at the GPU temp can be as well. Not just the system wattage but the actual hot air blowing from the case was a thing. Actually that 85c was within the normal range but still… 

I don’t think the 4090 gets above 50c. Those Titans were the hottest cards I’ve had. 

Edited September 20, 2024 by SharpeXB

[Hiob]

7 minutes ago, SharpeXB said:

I don’t think the 4090 gets above 50c.

 

As I said above. The efficiency has doubled since the 3000er generation. They certainly are "cool" cards! 

[SharpeXB]

3 minutes ago, Hiob said:

As I said above. The efficiency has doubled since the 3000er generation. They certainly are "cool" cards! 

Yes this hasn’t gone unnoticed

I went and put custom fan backplates on those. Looking back I can’t believe two things.
A noob like me took apart two $1,000 graphics cards.
And that they only cost $1,000

[SkateZilla]

In the Summer, My PC's Exhaust is vented outside :-). Keeps the AC from constantly kicking on,

In the Winter, My PC's Exhaust is vented into the room, and keeps it warmer in the fall/spring so I rarely run the heater. ( I grew up in Niagara Falls, 40-50 Degrees we get here in the winter is tank top weather for me.)

[SharpeXB]

Now add to this the drenched in sweat death grip stress of aerial refueling and combat! It’s embarrassing to admit you hurt yourself playing video games... Hey it’s not a game it’s a sim!

[SkateZilla]

22 hours ago, SharpeXB said:

Sure but looking at the GPU temp can be as well. Not just the system wattage but the actual hot air blowing from the case was a thing. Actually that 85c was within the normal range but still… 

I don’t think the 4090 gets above 50c. Those Titans were the hottest cards I’ve had. 

 

Current temps of the GPU hotspot doesnt change the outcome. Lower temps just mean they fixed the TIM and Concaved Die issue causing the heat to not transfer to the heatsink.

They still pull 300-400+ watts depending on the OC, the lower temps just mean that it is transferred to the Heatsink and blown into the system air or exhausted out the back more efficiently.

I've seen users that run 2 gaming PC's in the same room w/ 4090s, when gaming, if the door is closed, room temp rises by 4-7° in the spring/fall, more in the summer when the air is already warm, and fighting the outside heat.

There's also the issue of the 12VHPWR failures still.