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Helpful ReplyRunning two 3080's.

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comrade
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2020/09/29 07:14:13 (permalink)
Just out of curiosity, since Nvidia seems intent on ending SLI, would running two 3080's, both in PCIE-16 slots, provide a boost in performance over a single card, even though there is no NVLink connector between them?
 
If two cards were used, would there be any increase in performance by connecting my two monitors, one to each card?
 
I'm not talking about gaming so much as other workloads.  Video editing and rendering and very large spreadsheets and CAD work.  Running multiple programs, one on each monitor.  Tasks like that.  Would the SLI option even show up on the Nvidia control panel if two cards were detected in the system?
 
If there is any increase in performance, when the 20 Gb memory cards are introduced, would there be a larger boost?

Gigabyte TRX40 Aorus Pro WiFi Amd sTRX4 ATX MB, AMD Ryzen 9 Threadripper 3960x, Twin EVGA GTX 1080ti FE's in SLI,  twin , 28" 3840 x 2160 Monitors, Samsung 970 Evo 1T, M2 NVME SSD for OS, 3x2 TB Toshiba SATA3 HD's for storage, Samsung SH-203 SATA DVD Drive, Coolermaster 1000 Watt PSU, Win 10 Pro 64 bit, Coolermaster HAF 932 Advanced case. Logitech G910 Mechanical Gaming Keyboard, Razer Orochi 2013 Mouse.
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leezon
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Re: Running two 3080's. 2020/09/29 07:24:50 (permalink) ☄ Helpfulby comrade 2020/09/29 19:54:16
Nope, the SLI option isn't available in the Nvidia control panel unless NVLink is used. You COULD use 2 cards, but it would have to be apps that allow you to choose which GPU to use for workloads, but unfortunately it's not many and even then it would only be 1 card's power, they wouldn't work together on the same tasks.
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Huntercyril
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Re: Running two 3080's. 2020/09/29 07:26:47 (permalink) ☄ Helpfulby comrade 2020/09/29 19:54:12
3080 don't have SLI slots so you can't bridge SLI 3080. Also SLI DX11 is disabled for 3090 so even for Gaming it wouldn't work. I'm not familiar with how multi GPU would work in professional softwares so can't say for that.
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I_R0M_I
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Re: Running two 3080's. 2020/09/29 07:45:40 (permalink) ☄ Helpfulby comrade 2020/09/29 19:53:57
Ive never been impressed with dual cards. Ive ran Crossfire, and SLi, performance wasnt great on either.
 
It doesnt seem like many games really make the most of it? I think it was either BF3 or 4, i got more FPS with a single 1070, than 2 in SLi!
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comrade
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Re: Running two 3080's. 2020/09/29 20:11:44 (permalink)
I've been running two cards since the old 8800 GTX's.  At one time, I had quad SLI with two GTX 290's.
I think I hit every Nvidia card since then, always with two cards.  They did increase performance for the tasks I was doing.  Some games, but not many and it's been quite a few years.  Retired now and doing some consulting work for my old company and some of their customers.
 
I was just curious if it would work.  I guess I'll wait a while until I can get a 3090.  Not sure how much of an upgrade it will be replacing my twin GTX 1080ti's FE cards.
 
Just wondering.
 
Thanks for the info!

Gigabyte TRX40 Aorus Pro WiFi Amd sTRX4 ATX MB, AMD Ryzen 9 Threadripper 3960x, Twin EVGA GTX 1080ti FE's in SLI,  twin , 28" 3840 x 2160 Monitors, Samsung 970 Evo 1T, M2 NVME SSD for OS, 3x2 TB Toshiba SATA3 HD's for storage, Samsung SH-203 SATA DVD Drive, Coolermaster 1000 Watt PSU, Win 10 Pro 64 bit, Coolermaster HAF 932 Advanced case. Logitech G910 Mechanical Gaming Keyboard, Razer Orochi 2013 Mouse.
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EnderElement
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Re: Running two 3080's. 2020/09/29 21:28:16 (permalink)
I'm planning on getting two 3080s mainly for rendering. GPUs tend to scale very well in that since on Octanebench, x1 3080 has a score of 563 and x2 3080s have 1115 which is more than the x1 3090 with a score of 662. The main issues would then be the thermals and VRAM. Having one or two cards seems to still be fine but anything more could pose a problem. Not quite sure on what will happen if you connect a monitor to one card and another to the other. However with VRAM, two 10GB 3080s will only give you a total of 10GB. This is why I'm not a fan of Nvidia deciding what I can and can't do with my card, sure NVlink might not be popular anymore but I would like to have 20GB of total VRAM. I can kind of settle with 10GB knowing that out-of-core memory exists, which allows you to use your system RAM for storing texture data at the cost of some rendering time. With the 20GB 3080 cards, the only difference seems to be the VRAM and likely the higher cost as it has the same number of cuda cores as the 10GB 3080 so personally I wouldn't wait for them.
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