52
What is the deal with mobile GPUs vs PC GPUs?
(lemmy.world)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 02 Apr 2024
52 points (90.6% liked)
Asklemmy
43822 readers
906 users here now
A loosely moderated place to ask open-ended questions
If your post meets the following criteria, it's welcome here!
- Open-ended question
- Not offensive: at this point, we do not have the bandwidth to moderate overtly political discussions. Assume best intent and be excellent to each other.
- Not regarding using or support for Lemmy: context, see the list of support communities and tools for finding communities below
- Not ad nauseam inducing: please make sure it is a question that would be new to most members
- An actual topic of discussion
Looking for support?
Looking for a community?
- Lemmyverse: community search
- sub.rehab: maps old subreddits to fediverse options, marks official as such
- !lemmy411@lemmy.ca: a community for finding communities
~Icon~ ~by~ ~@Double_A@discuss.tchncs.de~
founded 5 years ago
MODERATORS
because its based on a curve. laptops have maybe 85% of the performance their desktop counterpart has, becauae that last 15% of performance is not power efficient.
you are also disregarding one MAJOR factor when comparing desktop and laptop gpus, noise.
laptop gpus, especially high end ones can sound like jet engines. large desktop gpus are large to minimalize noise it makes.
e. g my 7700S in my framework 16 can sound like a jet engine, the desktop equivalent of that, which is a 7600, is ridiculously power efficient and barely will make a noise because of the heatsink/die size ratio.
Also the laptop gpus tend to have less or “worse” memory for a variety of reasons (lower resolution screens means less need for VRAM or processing powe, lower power GDDR, lower RAM clocks, etc. That 85% number works in more than just straight rendering throughput
i wouldnt necessarily say that, there are times oems double ram capacity compared to their typical value on laptop, its just less common today than it used to because nvidia tax.
take for example back over a decade ago with maxwell, desktop 750tis on desktop were usually 2gb vram cards, even 1gb. on mobile, 860m/960m(the laptop equivalent) often had 4 gb vram varients. Laptop ram though will be clocked more conservatively.
Also, AMD APUs use your main RAM, and some systems even allow you to change the allocation - so you could allocate say 16GB for VRAM, if you've got 32GB RAM. There are also tools which allow you can run to change the allocation, in case your BIOS does have the option.
This means you can run even LLMs that require a large amount of VRAM, which is crazy if you think about it.
Problem is, system RAM does not have anywhere near the bandwidth that dedicated VRAM does. You can run an AI model, but the performance will be 10x worse due to the bandwidth limits.