Asus Strix X299-E very low SLI scaling after going from X99 to X299

[xarot]

I posted this question on NVIDIA forums too but perhaps there's a chance someone else might have the same issue. I cannot tell if this a UEFI or driver problem?

I have a strange problem with Strix X299-E motherboard and SLI with the latest NVIDIA driver 384.76 (actually, with any driver but the X299 platform is brand new and hit retail around week ago so I guess this is the correct to use).

The thing is, SLI scaling is only around 45 % to 75 %, usually sits around 60 to 66 % per card only. The 1080TI cards and PSU have been working perfectly fine on old X99 before I swapped the motherboard and CPU. Everything else is the same. I have tried Windows 8.1 and Windows 10 to no avail, changed all UEFI settings, checked PCIe lane speeds, tried HB and single SLI bridges, disabled G-Sync, disabled V-sync, changed game settings, disabled antialiasing, updated UEFI, changed motherboard voltages and what else. Nothing else to try I guess.

Only some titles like Metro 2033 seem to work somewhat normal, the rest don't. Even Fire Strike 1.1 doesn't but then again Fire Strike Ultra does? In Fire Strike 1.1 combined test the scaling is around 35 % per card and the scores are way off. 😞

Setup:
i9-7900X
Asus Strix X299-E motherboard
64 GB DDR4-3200 MHz (yeah, a single kit, CMD64GX4M8B3200C16)
Asus Strix 1080 TI OC SLI
Asus motherboard bundled HB bridge
Corsair AX1500i
Asus PG279Q G-Sync

[Zurvv]

I know for a fact that they are working on it. That said, god knows how long it will take. But the more people that put requests in does move it up in priority. (I assume their are fewer people with x299 than with HDR TVs connected to their PCs and that isn't fixed yet.)

[Blackleo]

SLI certification? X299 motherboard haven't finished SLI certification?
give us more details about that

[Raja]

Blackleo wrote:

SLI certification? X299 motherboard haven't finished SLI certification?
give us more details about that

NVidia perform their own certification, not us.

[valzero]

Raja@ASUS wrote:
NVidia perform their own certification, not us.

That was not very detailed was it.

[Raja]

valzero wrote:
That was not very detailed was it.

Doesn't need to be. They do their own certification work, not us. What's certification other than checking sli works when a board supports it? You should ask them. Yep a novel idea there; asking the people that actually perform the certification what it entails that isn't related to the drivers. 😉

[Silent_Scone]

valzero wrote:
That was not very detailed was it.

It's pretty obvious what this entails, to be frank. Which is why the whole song and dance being made here is fruitless and always has been. Support will come in a driver, as was said many days ago.

[Korth]

I fully understand NVIDIA's reluctance to rush formal certification - they need to develop their drivers/patches/etc ... and then comprehensively test, debug, and deploy in a manner which they can confidently expect will work (almost) 100% perfectly on (almost) 100% of the affected platforms in the wild. They sell high-end GPU cards for $1000~$1500+ so I'm fairly certain they'd make proper certification/compliance/compatibility a priority issue (unless they don't want to continue selling high-end GPU cards in these price brackets, lol?).

What I don't understand is NVIDIA's reluctance to release a beta version of some sort. Give the people something tangible, makes the people happier, makes NVIDIA happier. And get some potentially valuable feedback and bug reports/fixes under the hood to accelerate and improve the certification release versions.

"I am trying to get it into our next driver" and "we need to make sure ... it won't introduce stability issues for the user" seem like reasonable and detailed enough explanations to me, lol, no need to pester ASUS for more.

[xarot]

https://forums.geforce.com/default/topic/1017324/sli/x299-low-sli-scaling-and-bugs/post/5200475/#520...


"Sorry we do not do BETA driver testing but I did get confirmation that our next driver will indeed include the changes that restores optimal SLI performance on X299 motherboards."

Problem solved, hopefully.

[Zurvv]

Looks like they fixed it and it will be in the next drive release. i'm guessing next week.. but that is me just guessing because Agents of Mayhem is out next week. (and maybe new drivers for that.)

[valzero]

Zurvv wrote:
Looks like they fixed it and it will be in the next drive release. i'm guessing next week.. but that is me just guessing because Agents of Mayhem is out next week. (and maybe new drivers for that.)

I can hardly wait to stop googling this EVERY DAY. 😕