TLDR SPECS
CPU
4 core (2 core pairs) 3.2 GHz AMD x86 (Steamroller)
aggregate, 10x PS3 PPU performance
512 KByte L2 per core pair
64 bit pointers
GPU
AMD R10x series GPU @ 800 MHz (Tahiti)
aggregate 10x RSX performance, 1.84 TFlops
DX”11.5″
cheap branching
18 compute units, focus on fine grained compute & tessellation
MEMORY:
2 GByte UMA, pushing for 4 GByte
192 GByte/ sec non-coherent access for e.g. GPU
12 GByte/ sec coherent access for CPU
>50% longer memory latency for CPU/ GPU compared to PC!!!
DXT is lowest bpp texture compression format
MEDIA:
50 GByte BD drive
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
EXTRA HARDWARE:
video encoder/ decoder
audio processing unit, ~200 concurrent MP3 streams
HW zlib decompressor
Our source claims that the final specs should be 10x powerful than PS3, due to this info has got 10 months.
http://www.vgleaks.com/world-exclusive-ps4-in-deep-first-specs/