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NSAM's built the AI from hell with some Nvidia GPUs, go ahead and doubt it
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Date: February 26th, 2026 11:52 PM Author: Jared Baumeister (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698772) |
Date: February 27th, 2026 12:20 AM Author: wangfei specs and config (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698808) |
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Date: February 27th, 2026 12:21 AM Author: Jared Baumeister 2x 3090s, a 5090, and a 5060 ti + i5-14400 with 128gb DDR5. llama.cpp in a Debian 12 container (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698810) |
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Date: February 27th, 2026 12:22 AM Author: wangfei what mb. how so many pcie lanes? (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698811) |
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Date: February 27th, 2026 12:27 AM Author: Jared Baumeister Gigabyte z790 with PCIe bifurcation on the top PCIe 5.0 slot, plus two x16-size PCIe 4.0x4 slots on the mobo. I think all the Gigabyte z790 motherboards give you lanes out the ass on the slots, even the budget series (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698814) |
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Date: February 27th, 2026 12:32 AM Author: wangfei damn. what is total gpu vram? does llama see it all? how many parameter u can run?
edit, wait u run 5090 in 4.0 pcie slot? |
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Date: February 27th, 2026 12:43 AM Author: Jared Baumeister The PCIe 5.0 slot is split into x8x8, and the 5090 only uses 5.0x8. But it doesn't matter because you're never going to be limited by bandwidth until you drop below PCIe 3.0. It's just not an issue because the GPUs aren't sending/receiving that much data to begin with. I rarely see any GPU spike over 900 MiB/s in nvtop.
By far the biggest difference is Blackwell vs non-Blackwell, but it doesn't matter to me because I have multiple Debian containers with different GPU passthrough configs. So if I want to load big 70b models on the 3090s, and I just need another 8-12gb of VRAM, I can put the 5060ti in that container and give it the extra 16gb. Right now that's what I'm doing because the 5090 runs so well by itself. But I can also move the 5060 ti to that container if I need more than 32gb and I want to keep Blackwell features. And of course I can put all four in one container for 96gb, though I've seen no need to do that so far. Deepseek 4 is a wildcard, I have no idea what to expect |
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Date: February 27th, 2026 12:50 AM Author: wangfei so 5090 and 5060 split 5.0 8x8? and the 3090s running on 4.0 lanes? does llama see aggregate vram or you running containers that can only see portion of total vram? i am confused.
edit, saw your last 2 sentences got it. damn just slam everything into one container and see what you can do. |
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Date: February 27th, 2026 1:07 AM Author: Jared Baumeister The way Blackwell does KV offloading is black magic. The 5090 by itself will run 48gb models no problem. It just populates the VRAM and then it only populates <1gb of system RAM. I have no idea how to account for the missing 16gb. How can a 48gb model only use 32gb of VRAM and no system RAM?
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Date: February 27th, 2026 1:13 AM Author: wangfei ok fuck it. im buying a 5090 tmr. only running 4090 right now.
edit, ive been trying to snipe a 5090 FE, no luck. i will just get whatever like an asus. |
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Date: February 27th, 2026 1:28 AM Author: Jared Baumeister the MSIs are really good. I have the Gaming X Trio, which is in between the Ventus and the Suprim. The FEs are considered inferior and more likely to overheat or malfunction. Some Asus cards have fit issues with the power connectors too, need to research that (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698855) |
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Date: February 27th, 2026 1:47 AM Author: wangfei (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698869) |
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Date: February 27th, 2026 1:33 AM Author: Jared Baumeister also this magic KV offloading requires llama.cpp, and only works with gguf files. vLLM and SGLang won't do it. Ollama will do it but it's literally 1/10 the speed of llama.cpp with Blackwell (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698862) |
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Date: February 27th, 2026 10:11 AM Author: Taylor Swift is not a hobby she is a lifestyle (πΊπΈ π΅π±) Buy an RTX Pro 6000. It's far better than dual 5090s. (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49699206) |
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Date: February 27th, 2026 2:54 AM Author: Lab Diamond Dallas Trump how important are the extra GPUs? am i gonna be happy with the performance of a local model if i set up a 5090? (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49698903) |
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Date: February 27th, 2026 7:31 AM Author: Jared Baumeister No idea. I also haven't probed the limits of the 5090 yet. All I will say that I was initially disappointed with its performance in Ollama, and I didn't see big gains until I started using llama.cpp. You HAVE to compile llama.cpp and let it build whatever features it thinks it needs into the binaries (http://www.autoadmit.com/thread.php?thread_id=5838844&forum_id=2most#49699009) |
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Date: February 27th, 2026 9:28 AM Author: Jared Baumeister PS if you're using llama.cpp you can ask Claude how to tune the parameters to your particular situation.
You should also phave all drivers installed before you compile llama.cpp, so that it detects and installs the right modules
Also, if you have a mix of GPUs with different amounts of VRAM, you have tell llama.cpp how many layers to offload to each one and how many layers (if any) go to the CPU. It's such a grind that I'm making a spreadsheet of scripts for launching different models in different configurations
This is the PCIe bifurcation card I use. Even though it says it's only 4.0, it shows up as 5.0x8 in nvtop
Finally, all of these GPUs can be drastically power limited so that they run off one PSU. The 3080s can be run at 200W (400Wx combined), the 5060 uses 170W so you're only at 370W, then power limit the 5090 to 380W. So total draw is only 750W (and my CPU can only pull 65W, so it's not a problem to run them on one PSU. I'm using a 1600W PSU but I could probably get by with 1000W. Performance isn't an issue unless you're gaming, and cooler temps extend longevity |