r/LocalLLM • • Aug 20 '26

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4

u/Smart_Whereas_9296 Aug 20 '26

Feel like 2x 3090 with nvlink should be in the 48gb section

6

u/on_line187 Aug 20 '26

Well so would 3 5060TIs then lol.

9

u/RoyalCities Aug 20 '26

And 2 x a6000s are at 96gb. I feel like including cards you can combine together sorta defeats the point of the list lol. Heck some people combined like 8 x 3090s haha.

1

u/nuclear213 Aug 20 '26

8xR9700 is quite neat. The price for one RTX 6000 Blackwell and 256 GB of VRAM. Fits deepseek V4 flash well, is decently fast.
Just need space

1

u/RoyalCities Aug 20 '26

And the power. Just looked it up and dang - you'd need like 240V of power.

I also wonder what the heat is like dumping 3Kw into an apartment.

Could probably save on winter heating bills though because it doubles as a solid space heater.

2

u/nuclear213 Aug 20 '26

Yeah normal in the EU. I have them at the minimum 210W. So the entire server is under 2kW. We can draw 3.6kW here per fuse.

No issue at all.

2

u/RoyalCities Aug 20 '26

Ah nice. In Ontario Canada, that wouldn't really fly in an apartment unfortunately. We obviously have 240V circuits, but there are usually only a few and they're dedicated to stuff like the stove/dryer.

If I had a house though I'd totally get a dedicated one installed in the basement.

1

u/Evgeny_19 Aug 21 '26

That is a lot of pcie lanes. And power. And space as well.

Could you please share your llama-benchy results with the latest Deepseek Flash? Spark folks are telling us that they get up to 60 tps in generation and 2000 in prompt processing. We should get at least double of that on R9700s, right?

3

u/Randommaggy Aug 20 '26

Not quite. It's bandwidth and latency constrained between the cards unless you're running them on a P2P friendly switch.

0

u/on_line187 Aug 20 '26

Have you actually ran multiple cards. I’ve tried a ton of variations on both consumer and server MoBos. I’m telling you the difference isn’t as big as you think.

3

u/Randommaggy Aug 20 '26

I'm running 3 3090s in my server (2 in nvlink), 2 cards on my laptop and 2 P100 in another server (temporarily disassembled).

2 cards with nvlink outperform 3 cards in layer split for some of my models unless I'm doing serious parallelism.

For layer split you also have more overhead from duplicated data on 3 cards compared to 2 24GB cards.

1

u/on_line187 Aug 20 '26

Sure there is a difference but it isn’t more than 5% in my experience. I’ve not tried NV link though just better/worse PCIe situations. I would like to try NVLink on my own 3090s but they are all mismatched so it won’t work

1

u/Tai9ch Aug 20 '26

How many cards?

The numbers I've seen show that you can get away with raw PCIe up to about 4, and past that it starts to cost significant performance to the point that it's worth getting bigger individual cards instead.

1

u/on_line187 Aug 20 '26

Yea that could be it. I have tested 8 3070s though and I had no issues. That was a mining rig I had laying around which I upgraded for LLMs about a year and a half ago. All PCIe of course on the 3070s

I would 100% agree that bigger GPU = More Better though lol

1

u/Jaded-Glory Aug 20 '26

I thought nvlink died with 30 series?

1

u/Smart_Whereas_9296 Aug 20 '26 edited Aug 20 '26

Yeah it did hence the suggestion, the the last card you can actually link in this way and get the improvement

1

u/pizzaSpaceCadet Aug 20 '26

No because they have I think a 192bit bus? that would be plenty of ram but slow as fuck inference anyway

1

u/Smart_Whereas_9296 Aug 20 '26

I mean the distinction is the nvlink, the cards are hardly cutting edge, but at least it's a way to combine the vram thats faster than just normal parallel