AMD’s AM4 Platform Details Leaked: µOPGA Based Socket with 1331 Pins, 140W Max TDP [Updated]


Update 24th March 2016, 1:05 PM: Looks like this particular leak was spot on. We have received confirmation from multiple sources about the µOPGA 1331 pin socket from AMD (aka AM4). The socket itself has also been spotted on a Zauba shipping manifest offering independent confirmation by itself along with the Bristol Ridge code name, indicating that AMD's upcoming Excavator based platform is well on track for release this year:

[Original Article] Details of AMD's upcoming AM4 socket have leaked out courtesy of folks over at Bitsandchips.it. According to the report, AMD will be shifting to a µOPGA socket as opposed to the OPGA one that has been used before. The change would allow the chip maker to house processors with TDP of up to 140 Watts while utilizing a total of 1331 pins (which is approximately 391 more pins than what AMD has used in previous AM/FM sockets). This particular socket is designed to house all of AMD's upcoming platforms: including the mainstream Zen CPUs and APUs.

AMD Desktop Platform Evolution AM4AMD's AM4 desktop road map featuring the Zen based CPU and APU platforms

AMD's upcoming AM4 socket will be based on a µOPGA design with 1331 pins

AMD has been a devout supporter of Pin Grid Array socket types and it looks like the AM4 will be no different. OPGA stands for Organic Pin Grid Array (the 'organic' in the term stands for the plastic attached to the silicon die, out of which the pins protrude), and according to this report, the company is deploying a new standard called the µOPGA socket. The micro in the term indicates that AMD will be using pins with less diameter, which will presumable be weaker than OPGA based pins. Going up from 940 pins to 1331 is an increase of approximately 40% and it is implied that AMD will be decreasing the distance between the pins.

This means that while the µOPGA AM4 socket size will remain approximately the same, it will be much more fragile than previous OPGA based iterations. AMD hopes to use this particular socket for all its mainstream and enthusiast platforms - including APUs. AMD's AM4 will combine the best points of AM1+, AM3+ and FM2 sockets. These will be deployed in everything from a budget AIO motherboard to the integrated PCH schematics of  Bristol Ridge. In fact, we have seen patents being filed of multiple new sockets from AMD including a switchable, LGA design (which could also be for a new server class platform):

US Patent number "US20140043768 A1", filed in 2012 and published in 2014, describes a brand new socket (which is switchable from PGA to LGA) from  AMD:

The present invention provides embodiments of a package retention frame. One embodiment of the package retention frame is configured for deployment adjacent a top surface of an integrated circuit package. A grid of contacts is on a bottom surface of the integrated circuit package. The package retention frame when deployed substantially maintains alignment of the grid of contacts with a grid of pins in a socket. An outer boundary of the package retention frame is substantially encompassed by an outer boundary of the socket.

The AM4 socket will initially support two of AMD's mainstream platforms. The first one, is Summit Ridge which is the mainstream desktop CPU platform from AMD that will utilize the x86 Zen micro-architecture. The process will be 14nm FinFET (according to footnotes in AMD’s older slides) and will be based on the Promontory Chipset. The TDP is stated to be around 95W – although this remains to be seen. The processor will scale upto 8 cores, have SMT based multi-threading, around 40% IPC gains over Excavator and will be fully compatible with DDR4 memory. The socket, is of course the AM4.

Similarly, AMD's Bristol Ridge platform is the APU platform that will be landing sometime this year. It is expected to arrive before any Zen based platform such as Summit Ridge. This platform will not utilize the Zen uarch and instead use Excavator. The APUs will be fabricated on the 28nm process and will have a maximum of 4 CPU cores and “Next-Gen GCN” based GPU cores. They are going to come in both AM4 and FP4 packaging and will support both DDR3 and DDR4 (depending on the chip). The TDP is once again thought to be around 95W and the socket AM4. Bristol Ridge should be succeeded by Raven Ridge later on, which will be the APU family to feature Zen based z86 cores, Raven Ridge will be on the same node as Summit Ridge. AMD AM4 motherboards are rumored to launch by Q2 2016.

AMD Bristol Ridge Desktop AM4 SKUs:

SKUCoresBase/Boost ClockGPU CUsGPU SPsGPU Clock Memory TDP
AMD A12-980043.8/4.2 GHz8 CUs512 SPs1108 MHzDDR4-240065W
AMD A12-9800E43.1/3.8 GHz8 CUs512 SPs900 MHzDDR4-240035W
AMD A10-970043.5/3.8 GHz6 CUs384 SPs1029 MHzDDR4-240065W
AMD A10-9700E43.0/3.5 GHz6 CUs384 SPs847 MHzDDR4-240035W
AMD A8-960043.1/3.4 GHz6 CUs384 SPs900 MHzDDR4-240065W
AMD Athlon X4 95043.5/3.8 GHzN/AN/AN/ADDR4-240065W
AMD A6-950023.5/3.8 GHz6 CUs384 SPs1029 MHzDDR4-240065W
AMD A6-9500E23.0/3.4 GHz4 CUs256 SPs800 MHzDDR4-240035W
Athlon X4 97043.5+/3.8 GHz+N/AN/AN/ADDR4-240065W
Athlon X4 95043.5/3.8 GHzN/AN/AN/ADDR4-240065W
Athlon X4 94023.2/3.5 GHzN/AN/AN/ADDR4-240035W