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Why do we need pins on the CPU or in the socket? Why not have pads on both?
- Thread starter Quartz
- Start date
So how does having a bed of pins (LGA) make it easier?
Soldato
I don't have an actual answer, but presumably it is easier to have pins that can bend to accommodate variances in flatness/mounting pressure etc. That way you make the socket/pcb as flat as is easy to make, the pins then assure good contact by being able to bend differently across the area to take up and slack in tolerances? Just a guess though.
I think you probably mean convex, but the same issue would apply, if any of them protruded a little more/less than the others then the chip would sit on those longer bumps and the shorter ones wouldn't make contact.
I guess a non chip analogy would be when the legs on a chair aren't quite the same length and only 3 of the 4 are in contact with the ground causing it to rock
Maybe make them springy to ensure good contact?
And that's back to pads and springy contacts again.
Ah, that actually clarifies it immensely.
The pins in lga at least intel ones are a sort of cantilever spring they will all be at a minimum height when the cpu goes in it slightly bends all the pins ensuring good contact
Associate
- Joined
- 22 Oct 2012
- Posts
- 1,089
Soldato
We could always go back to cartridge CPUs.
https://en.wikipedia.org/wiki/Slot_1
https://en.wikipedia.org/wiki/Slot_1
Don
Because the "pins" in an LGA socket are actually slightly sprung - if you've ever had to straighten any, they aren't the same as the straight pins on a processor - they are more like small shaped wedges, that emerge at an angle
Yep. My Pii 450 was £600 nearly a quarter of a century ago but at least it felt like you were getting a proper piece of kit
This
My Celeron 300A clocked past 450mhz (this is "overclockers" afterall!) was £63.64 iirc nearly a quarter of a century ago and still felt like you were getting a proper piece of kitYep. My Pii 450 was £600 nearly a quarter of a century ago but at least it felt like you were getting a proper piece of kit
Notice how the pins are really long? That ensures some part of the pin will make contact.
Its the exact same thing with graphics cards, the connection is a long piece of copper.
Ensuring a good connection between two flat surfaces is extremely difficult to achieve on a mass production due to the tight tolerances
These days that would be a PCI-E CPU.
My Celeron 300A clocked past 450mhz (this is "overclockers" afterall!) was £63.64 iirc nearly a quarter of a century ago and still felt like you were getting a proper piece of kit
Yes I was a pretty clueless 20ish year old at the time. Glad I didn’t find this out for about another 10 years
https://youtu.be/vzKcrwlmREE
This video goes into a bit of details on LGA vs PGA. LGA pins are springs which give you proper contact with CPU.
LGA pin damage means RMA motherboard. So best to keep your receipt available if you have a habit of dropping cpu or stuff onto the socket
This video goes into a bit of details on LGA vs PGA. LGA pins are springs which give you proper contact with CPU.
LGA pin damage means RMA motherboard. So best to keep your receipt available if you have a habit of dropping cpu or stuff onto the socket