AMD Ryzen Threadripper sTRX4 & TR4 Socket Pin Layouts Detailed – Vastly Different Config on 3rd Gen TRX40 Platform

Nov 15
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The pin layout of AMD's Ryzen Threadripper sTRX4 and TR4 sockets has been detailed by Hwbattle who have compiled a full pin configuration map for the two sockets. It looks like with the updated pin map, we shouldn't expect any kind of compatibility with the older TR4 socket-based CPUs even if the sockets look visually identical.

AMD Ryzen Threadripper sTRX4 & TR4 Socket Pin Configuration Detailed - Different Electrical Changes Equal Zero Compatibility With Older Ryzen Threadripper CPUs

Since the start of the 3rd Gen Ryzen Threadripper processor rumors, we have been hearing that the new TRX40 platform won't support older processors. This was confirmed a few days ago with the announcement of 3rd Generation Ryzen Threadripper processors and the respective TRX40 series motherboards. Motherboard manufacturers clearly mentioned that their TRX40 series are compatible only with the 3rd Gen Threadripper series and not the older lineup.

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Today, HwBattle has released the first pin layout of both the sTRX4 and the TR4 socket which shows just how much of a difference there is between the two sockets. Right from the start, we could not that on sTRX4, lots of pins that were previously unused by the TR4 socket have been enabled. The pin count is still 4094 for the socket itself for the SP3 socket but the revised naming should be considered here. The sTRX4 SP3 socket has more pins enabled than the TR4 SP3 socket.

The following are high-res photos of the sTRX4 and TR4 socket pin layout. (Image Credits: HwBattle).

AMD sTRX4 SP3 Socket For 3rd Gen Threadripper:

AMD TR4 SP3 Socket For 1st/2nd Gen Threadripper:

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AMD Ryzen Threadripper Generation Comparison:

Family NameAMD 1st Gen Ryzen ThreadripperAMD 2nd Gen Ryzen ThreadripperAMD 3rd Gen Ryzen Threadripper
CPU ArchitectureZen 1Zen+Zen 2
Process Node14nm12nm7nm
Max CPU Cores163232
(64 Expected In 2020)
Max CPU Threads326464
(128 Expected In 2020)
PCIe SupportPCIe Gen 3.0PCIe Gen 3.0PCIe Gen 4.0
Max PCIe Lanes646472
Max L2 Cache8 MB16 MB32 MB
Max L3 Cache32 MB64 MB256 MB
SocketTR4TR4sTRX4
ChipsetX399X399TRX40, TRX80, WRX80
Launch201720182019

It is mentioned that AMD has implemented ID pin recognition to match compatible CPUs with their socket and in this case, the sTRX4 socket would only support 3rd Gen Threadrippers. The socket will prevent boot on any older processor by recognizing the pin configuration. This is similar to what Intel did with their LGA 1151 socket, enabling a different pin configuration on Coffee Lake processors compared to Kaby Lake. And while the socket was visually the same, the electrical changes meant that you can't boot any 7th Gen LGA 1151 chips on the new 300-series LGA 1151 motherboards. For those who want the full roundup of sTRX4 socket-based TRX40 motherboards, head over to this link.

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