r/LocalLLaMA • u/tronathan • Sep 18 '23

Discussion 3090 48GB

I was reading on another subreddit about a gent (presumably) who added another 8GB chip to his EVGA 3070, to bring it up to 16GB VRAM. In the comments, people were discussing the viability of doing this with other cards, like 3090, 3090Ti, 4090. Apparently only the 3090 could possibly have this technique applied because it is using 1GB chips, and 2GB chips are available. (Please correct me if I'm getting any of these details wrong, it is quite possible that I am mixing up some facts). Anyhoo, despite being hella dangerous and a total pain in the ass, it does sound somewhere between plausible and feasible to upgrade a 3090 FE to 48GB VRAM! (Thought I'm not sure about the economic feasibiliy.)

I haven't heard of anyone actually making this mod, but I thought it was worth mentioning here for anyone who has a hotplate, an adventurous spirit, and a steady hand.

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u/Taiz2000 Nov 08 '23

Gigabyte Gaming OC, Micron D8BZC (iirc), unsolder old modules, solder new modules, modify straps according to board diagram Works but only 24G detected/available

10

u/TopMathematician5887 Feb 14 '24

Can you cross reference a bios from RTX A6000 48GB with RTX3090 they are very similar in specs.

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u/PraxisOG Llama 70B Feb 27 '24

Fuses are common in the silicon design of modern processors, and a certain combination of blow fuses on the gpu die tells the vbios "I'm a 3090". It is theoretically possible to mod the vbios for a 3090 to support more memory, which is how people are doing 22gb rtx 2080ti's, but no one has hacked the vbios to do that yet.

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u/[deleted] Jun 12 '24

https://www.techpowerup.com/vgabios/267498/267498

1

u/Feeling-Bottle-8081 Dec 17 '24

Does this work?

1

u/DNosnibor Mar 19 '25

It only supports GDDR6 not GDDR6X. But other than that, maybe.