8-year-old Xeon with SLI Titans XPs is faster than 1-year-old 64core SLI 3090s

[NeoXanthus]

My power supply is about 1 year old. I bought the biggest best one I could find at the time. It is a 2000watt EVGA supernova it is connected to NEMA L6-30 to IEC C19 cable.

Here is a picture of my PS.

https://i.imgur.com/g0YIRsM.jpg

Here is a picture of 3dspy w/ HWinfo.

https://i.imgur.com/0jQQaCi.png

Here is the 3dmark link.

https://www.3dmark.com/3dm/65920838

Also here the exact cards they are ASUS EKWB 3090's they use dual 8pins so they should be good for 350 watts of power.

https://www.asus.com/us/Motherboards...RTX3090-24G-EK

[Braegnok]

OK,..
Your system info during the Time Spy run is on the right, mine is on the left running default settings.



Compairing power consumption during the run,.. seems your cards are drawing much lower power than mine.

Not shure if that is the issue, as your power supply, cables seem fine,.. perhaps your cards run at 100%, under load on lower voltage.

Sorry I still do not see anything to confirm reason for the performance loss.

[RedSector73]

OP, can you run Userbench and then provide link your end results, I'll take a look.
https://www.userbenchmark.com/

something is not right.

[NeoXanthus]

OK,..
Your system info during the Time Spy run is on the right, mine is on the left running default settings.



Compairing power consumption during the run,.. seems your cards are drawing much lower power than mine.

Not shure if that is the issue, as your power supply, cables seem fine,.. perhaps your cards run at 100%, under load on lower voltage.

Sorry I still do not see anything to confirm reason for the performance loss.

You are correct; your card is precisely at the TDP power of 350 watts recommended by Nvidia.

I ran HWiNFO64 and looked at my Asus 3090 EKWB the sensors under the GPU Performance Limits section. “GPU Performance Limits� states that “GPU performance is reduced from maximum due to SLI GPU Boost Sync.� Is there any way to change this behavior? It seems the cards are auto throttling power because there are two cards in the system?

https://i.imgur.com/4BmHoA6.png

How do I fix this issue short of selling my cards and find replacements from a different vendor? The problem follows these Asus cards, not the computer. When I put the cards in my second workstation, the scores were very similar, just slightly slower due to the CPUs. Conversely, when I put TitanXPs cards back in my main AMD workstation, my scores were around 16k

[Grimpak]

The memory is 3200mhz, which is the correct speed for the 3990x Threadripper. I have already tested this via the SPD overclock to 3600mhz. However, it does not make much difference in performance as the latency is also increased in the profile

you can supertune it (fiddle with the primary and secondary timings). However that is a very time-consuming effort, I must tell you. Considering zen2 specs, there is benefit to bring the memory up to speed of the infinity fabric (Fclk). To note that since ram runs at double data rate, that actually means half of the ddr speed too. Fclck on zen2 usually sits on the 1800mhz, so pulling speed up to 3600mhz and then finetune timings can bring extra performance to the table.

Now for the issue at hand, maybe there's a bios setting we're ignoring?

[Grimpak]

How do I fix this issue short of selling my cards and find replacements from a different vendor? The problem follows these Asus cards, not the computer. When I put the cards in my second workstation, the scores were very similar, just slightly slower due to the CPUs. Conversely, when I put TitanXPs cards back in my main AMD workstation, my scores were around 16k

go to the drivers, raise power limit? or use afterburner to raise power limit?

[NeoXanthus]

OP, can you run Userbench and then provide link your end results, I'll take a look.
https://www.userbenchmark.com/

something is not right.

https://www.userbenchmark.com/UserRun/46181797

I don't think that is the right test as it only test a single card.

[NeoXanthus]

go to the drivers, raise power limit? or use afterburner to raise power limit?

I tried, does not change the outcome like it is locked by the bios.

[Braegnok]

You are correct; your card is precisely at the TDP power of 350 watts recommended by Nvidia.

I ran HWiNFO64 and looked at my Asus 3090 EKWB the sensors under the GPU Performance Limits section. “GPU Performance Limits� states that “GPU performance is reduced from maximum due to SLI GPU Boost Sync.� Is there any way to change this behavior? It seems the cards are auto throttling power because there are two cards in the system?

https://i.imgur.com/4BmHoA6.png

How do I fix this issue short of selling my cards and find replacements from a different vendor? The problem follows these Asus cards, not the computer. When I put the cards in my second workstation, the scores were very similar, just slightly slower due to the CPUs. Conversely, when I put TitanXPs cards back in my main AMD workstation, my scores were around 16k

I would try Afterburner, see if you can remove performance limits, and adjust power limit.

You will need the newest Afterburner 4.6.4 Beta 3 Version. And turn the power selection on in the settings.

[NeoXanthus]

I would try Afterburner, see if you can remove performance limits, and adjust power limit.

You will need the newest Afterburner 4.6.4 Beta 3 Version. And turn the power selection on in the settings. https://youtu.be/KLB8TyCuK4w

Thank you for the suggestion, but I already use the newest MSI afterburner. Setting the power is not changing anything. The result still never throttles up all the way.

I just tried an OpenGL program Luxmark (which I believe does not use the SLI bridge), I can get the cards to go 100% power TDP power.

https://i.imgur.com/kWJgpjk.png

I believe there is something on these 3090 ASUS EKEB cards to kneecap their performance via power if using the SLI bridged. How can I fix this?