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(01-11-2013, 12:23 PM)
jeff_rigby's Avatar

Originally Posted by thuway

A source has recently come out and said the latest devkit with PS4 has 4 GB GDDR5. He also mentions there will be no APU + GPU, but it will be APU only. The rest of the specs match up almost exactly with the VGleaks. I could say something to get people fired, but the VGleaks page has the majority of things correct. Things can change from now til launch.

http://www.************/world-exclusi...p-first-specs/ Really old spec before Jaguar was announced. APU only and GDDR5 both have issues. AMD recommends APU + GPU until 2014 GPUs and GDDR5 is too expensive and hot.


4 core (2 core pairs) 3.2 GHz AMD x86 (Steamroller) moved on to 2 Jaguar packages (Sweetvar26 and Kabini (Jaguar) is the first SoC that can add third party IP)
aggregate, 10x PS3 PPU performance
512 KByte L2 per core pair with Jaguar L2 is 2 meg/package
64 bit pointers


AMD R10x series GPU @ 800 MHz (Tahiti) moved on from 7000 series GPU to 8000 series GPU
aggregate 10x RSX performance, 1.84 TFlops aggregate is APU GPU + second GPU
DX”11.5″ Current Microsoft DX spec is 11.1 this must include some future features. At the time this was posted OpenGL was catching up with DX
cheap branching
18 compute units, focus on fine grained compute & tessellation 2 CUs + 16 CUs (Temesh APU has a 8280 2 CUs)


2 GByte UMA, pushing for 4 GByte 4GB UMA likely wide IO
192 GByte/ sec non-coherent access for e.g. GPU Yole speculation 102 Gbyte/sec apx equal to wide IO memory (512 bit) Could be 1024 bit and apx 200 GB/sec
12 GByte/ sec coherent access for CPU both explained by this link to a AMD developer slide show.
>50% longer memory latency for CPU/ GPU compared to PC!!!
DXT is lowest bpp texture compression format


50 GByte BD drive likely upgraded to 4 layer which will allow 4K blu-ray using HEVC
PCAV, between 3.3 and 8x BD, most likely clamped to 6x
automatic background caching to HDD
HDD SKU with at least 380 GByte
downloadable games


video encoder/ decoder (Decoder in all AMD APUs) Encoder may be also for Chat
audio processing unit, ~200 concurrent MP3 streams
HW zlib decompressor already in all AMD APUs part of the W3C specs
Missing here is the DSP for the depth camera
FPGA speculation based on CTO programmable arrays and SemiAccurate FPGA. Small FPGA for Ray intersection-database calculations 100X faster than CPU(May be the DX 11.5 feature).
16 gig Flash memory for fast loads of OS and memory swaps

Yole attended the Sony VP Technology Platform lecture and speculated 512 bit wide IO for PS4. In the lecture Yutaka was comparing the PS3 1 S3D to what would be needed by the PS4 to support 5 S3D views. 5 X PS3 bandwidth is about 102 Gbytes/sec and equal to or less than 512 bit wide IO bandwidth. The cost for TSVs and Transposer are fixed, 3D stacked DDR memory should be much cheaper and cooler than GDDR5. AMD GPUs would still be memory bandwidth starved at 100 GB/sec so some internal cache for GPU will be needed. Since AMD has plans to use Wide IO memory in 2014 there should be some near future AMD GPU design including a eDRAM or eSRAM cache that will be used.

The specs above were taken from a developer platform and are close to final target. outed the Thebe and Kryptos AMD designs in their Oct 8 2012 update.

AMD Southern Islands: Radeon HD 7950 (TAHITI PRO), Radeon HD 7970 (TAHITI XT), Radeon HD 7990 (NEW ZEALAND), IBIZA, COZUMEL, KAUAI.
AMD Sea Islands: Oland, Bonaire, Hainan, Curacao, Aruba.
AMD Solar Systems: Mars, Sun, Neptune, Venus.
AMD Kabini, Samara, Kaveri, Pennar.

Pennar/Samara (2014 Jaguar APU) ported from 20nm TSMC database to Global Foundries. It has 2 128 bit LPDDR3 memory interfaces and a New GNB. It fits in the same product lineup as Kabini. My guess is that Pennar is the near future AMD APU design being used by the PS4.

links indicating PS4 is using a Interposer and stacked (likely DDR3) memory.

Professional papers predicting the PS4 will use an interposer and stacked RAM

Low power XTV mode needed and stacked wide IO memory needed

PS4 includes encoder to serve to handhelds

Amkor now assembling multiple interposer and stacked RAM projects