this post was submitted on 13 Nov 2023
1 points (100.0% liked)

LocalLLaMA

3 readers
1 users here now

Community to discuss about Llama, the family of large language models created by Meta AI.

founded 1 year ago
MODERATORS
communick@poweruser.forum
1
AMD vs Inel (alien.top)
submitted 1 year ago by _kinad@alien.top to c/localllama@poweruser.forum
8 comments fedilink hide all child comments
 

I'm looking to build a new PC(which I've never done, other than upgrade my current one) for running and fine tuning 7b models. I know I'll be getting dual 3090 or 4090 GPU, but I'm not sure which CPU would be best for this.

I'm wanting to take advantage of the bundle deals at my local micro center and down to these two options:

  1. AMD Ryzen 9 7900x 4.5ghz 12 core, Asus B650E-F motherboard and 65GB DDR5 for $600
  2. Intel i9 14900k 3.2ghz 24 core, MSI Z790 MAG Tomahawk motherboard and 65gb DDR5 for $800

Anyone know which would be best for my use case? I don't mind spending the extra $200, I only want the best option of the two

Thanks in advance

you are viewing a single comment's thread
view the rest of the comments
[–] Asleep_Comfortable39@alien.top 1 points 1 year ago (2 children)

Hmm. Im not a fan of the 7900x. It has two CCUs like the 7950x, but only 6 cores per. It ends up being pretty awkward in practice on my 7950x3d. I’d recommend going all in on a 7950x, or do a 7800x3d. Im not educated on if the extra cache benefits LLM, but it’s a fantastic value for the money.

[–] llama_in_sunglasses@alien.top 1 points 11 months ago (1 children)

The lopsided CCUs in X3D parts are not the same as the ones on 7900X/7950X. The cache ensures that you need a scheduler that can put loads that need it on the cache-enabled portion and that's asking a lot from a scheduler. The AMD parts without extra cache don't suffer from this issue... it's why I got a 7950X, but the 7900X is also fine and all three of these CPUs will be entirely limited by memory bandwidth if used for CPU inference.

[–] Asleep_Comfortable39@alien.top 1 points 11 months ago

Information moving between CCU’s is troublesome with certain workloads. I’m not referring to the lopsided cache, but rather the limitations of what is basically two CPUs merged together and the complications that adds to their shared I/O.

I don’t recommend the 7900x because it is a failed 7950x. I recommend the 7800x3D and the 7950X as long as the prices are within stretching for. The 7950x3D fits a very niche role as well.