Difference between TR4 & SP3

[drajitsh]

Does anybody know the difference between socket Sp3 for epyc & TR4 for threadripper. I can think of 3 possibilities
1. The Sockets are the same but the motherboards are different. Eg. Epyc in a threadripper will only have access to 4 memory channels and 60 +/- 4 PCIe lanes.
2. The pin outs are different, maybe pounds 100-200 are for PCIe in TR4 but carry power in SP3.
3. The chipset makes the difference, 4094 pins + x399 is required for threadripper, but x399 boards are barred by firmware from using EPYC.


But these are all suppositions of my part. Can anyone confirm exactly what's up?

 

[Pick2]

Curiosity killed the cat , you've killed hundreds in the last week 🙂

They both have 4094 pins but Epyc and Threadripper are not interchangeable.

 

[drajitsh]

Yep and I want to kill more cats,
I already said that they are not interchangeable. usually, this is a trick pulled off by intel, and they usually increase or decrease the pin like, socket 1150, 1151, 1156, or change the tabs. what's going on here?

 

[Pick2]

The Plus side is you can use the same cooling solution on either platform , probably economies of scale using the same socket - basic PCB layout etc
They are targeted at different markets ; Server and consumer/workstation. ( both support ECC ram )

"Each EPYC processor is equipped with eight memory channels, which supports up to 16 DIMMs of DDR4 DRAM of speeds up to 2,666 MHz. So each socket can access up to 2 TB. On a dual-socket system, that doubles to 4 TB.

• All Threadripper chips pack a whopping 64 PCI-E lanes ( single CPU only platform )

• Memory: Quad-channel DDR4

• Ryzen Threadripper CPUs will support up to 1TB of RAM when 128GB LR-DIMMs are used