PS4 GPU is HD7870 confirmed

[freedquaker]

HD7850: 1.76 TFLOPS, Engine Clock 860Mhz, 16 Compute Units (1024 Stream Processors), 64 Texture Units , 2/4GB GDDR5 with 153.6GB/s memory bandwidth

PS4 GPU: 1.84 TFLOPS, Engine Clock 800Mhz, 18 Compute Units (1152 Stream Processors), 72 Texture Units , 8GB GDDR5 with 176.0GB/s memory bandwidth (shared with CPU)

HD7870: 2.56 TFLOPS, Engine Clock 1000Mhz, 20 Compute Units (1280 Stream Processors) , 80 Texture Units , 2/4GB GDDR5 with 153.6GB/s memory bandwidth

 

http://www.extremetech.com/extreme/171375-reverse-engineered-ps4-apu-reveals-the-consoles-real-cpu-and-gpu-specs

As confirmed in the link above PS4 is a HD7870, not HD7850. What's really is going here is

They disabled 10% of the compute units for improving yields, and downclocked the GPU to avoid overheating and noise in a compact form factor. Let's do the math:

10% reduction in compute units give you

20*0.9 = 18 CUs

1280* 0.9 = 1152 Stream processors,

80*0.9 = 72 Texture Units,

In addition to that 20% decrease in operating frequency gives you

2.56 * 0.8 * 0.9 = 1.84 TFLOPS

So this is exactly an downclocked HD7870 with 10% disabled CUs BUT it has more bandwidth and a lot more fast RAM in addition to low level API excess, and standardized hardware. You cannot instantly expect miracles but this results in

a) Much lower CPU utilization (50-70% reduction)

b) More raw power (50-100% better performance)

c) Better optimization (more juice from the same hardware)

d) More stable performance

e) Better utilization of hardware due more and guaranteed bandwidth

f) More standardized future technologies

etc...