https://www.reddit.com/r/hardware/comments/izmi1k/ampere_poscapmlcc_counts/
글을 실수로 등록했습니다 일단 링크만 올려두고 내용 가져오겠습니다
제가 컴 용어를 정확히 모르기 때문에 잘못 이해하거나 적는부분이 있을지도 모르니 참고바랍니다.
Igor labs라는 곳에서 3080 카드들이 POSCAP MLCC 선택에 따른 문제가 있다고하네요
MLCC POSCAP 이 정확히 뭔지 설명해주실건 고수분들이 해주실꺼고
저는 Palit Gaming Pro OC 입니다
베개에 눈물자국 묻히러 갑니다 ㅠㅜ
============================================= 수정 09 27
레딧 댓글에 전기 엔지니어이자 PCB 디자이너가 작성한 댓글이 있네요
긴 영어내용이지만 요약하면 MLCC good Poscap Bad를 하기보다
GPU마다 다른 디자인을 가지고 있고
MLCC POSCAP 이 장단점을 가지고 있다하네요
부정확한 정보를 가지고 아직 판단하지 말라고하네요
I posted this in the original post but i think its valid here as well:
So, as an Electronics Engineer and PCB Designer i feel i have to react here.
The point that Igor makes about improper power desing causing instability is a very plausible one. Especially with first production runs where it indeed could be the case that they did not have the time/equipment/driver etc to do proper design verification.
However, concluding from this that a POSCAP = bad and MLCC = good is waaay to harsh and a conclusion you cannot make.
Both POSCAPS (or any other 'solid polymer caps' and MLCC's have there own characteristics and use cases.
Some (not all) are ('+' = pos, '-' = neg):
MLCC:
+ cheap
+ small
+ high voltage rating in small package
+ high current rating
+ high temperature rating
+ high capacitance in small package
+ good at high frequencies
- prone to cracking
- prone to piezo effect
- bad temperature characteristics
- DC bias (capacitance changes a lot under different voltages)
POSCAP:
- cheap more expensive
- bigger
- lower voltage rating
+ high current rating
+ high temperature rating
- less good at high frequencies
+ mechanically very strong (no MLCC cracking)
+ not prone to piezo effect
+ very stable over temperature
+ no DC bias (capacitance very stable at different voltages)
As you can see, both have there strengths and weaknesses and one is not particularly better or worse then the other. It all depends.
In this case, most of these 3080 and 3090 boards may use the same GPU (with its requirements) but they also have very different power circuits driving the chips on the cards.
Each power solution has its own characteristics and behavior and thus its own requirements in terms of capacitors used.
Thus, you cannot simply say: I want the card with only MLCC's because that is a good design.
It is far more likely they just could/would not have enough time and/or resources to properly verify their designs and thus where not able to do proper adjustments to their initial component choices.
This will very likely work itself out in time. For now, just buy the card that you like and if it fails, simply claim warranty. Let them fix the problem and down draw to many conclusions based on incomplete information and (educated) guess work.
(비밀상점)
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