PS4 'isn't quite as powerful as Epic was hoping for,' Digital Foundry reports

[Pemalite]

ethomaz said:

Pemalite said:

Which is enough for 1080P gaming for a year or two before games will be forced back into 720P land again.
GPU's in the PC space already have 288Gb/s at the high end, next generation will boost it to 384Gb/s if the rumours of the hardware are to go by and that's memory bandwidth JUST for the graphics card.

Also, what about the other components? CPU is taking 20Gb/s, what about the optical drive? mechanical drive? I/O processors, they all take some too, so the GPU will still end up less than 154Gb/s of memory bandwidth, making it end up probably with less than a Desktop Radeon 7850's memory bandwidth, ouch.

lol no... 200GB/s, 300GB/s, 400GB/s, etc is more for super high resolutions with super high AA filters... 1080p with 4xAA is fine with less than 170GB/s.

Rubbish.
You think texture's, effects, geometry data doesn't take any bandwidth? The more bandwidth, the more you can dial up those effects, regardless of resolution.
You are also forgetting that the PS4 is fixed hardware, it's not going to magically get any speed increases in it's life time, 170GB/s is fine now, but how amenic isn't it going to look in a few years time?
Hell, the Playstation 2 could in theory do 1080P with 4x Anti-Aliasing, but guess what? The games are going to look horrible as sacrifices to other things will have to be made and the PS2's memory bandwidth isn't anywhere near even a PS4.

ethomaz said:

drkohler said:

ethomaz said:

... the CPU have only 20 GB/s access to the RAM...

where does that number come from?

GDC.

"While the GPU has full access to 176GB/s, one source tells us that the CPU is more constrained at around 20GB/s - still pretty good at around two-thirds the level of bandwidth available to Intel's Ivy Bridge."

http://www.eurogamer.net/articles/digitalfoundry-inside-playstation-4

In any case no CPU have this high access to RAM even in PC... 20GB/s is twice the bandwidth used in the TOP Intel CPU in the market. 

Actually, my processor is hitting almost 70GB/s in memory bandwidth, quad-channel DDR and all.
The memory controller certainly isn't that crap.

ethomaz said:

NYCrysis said:

Doesn't the cell have like 25gb/s of bandwidth from the xdr memory in the ps3?

Yeap... Cell in PS3 have a better bandwidth than the GPU RSX but the Cell do graphics tasks in PS3 at the same time that share RAM with the GPU (the 256MB XDR can be accessed by the RXN using the Cell like a Data Move).

The CPU in PS4 can't do graphcic tasks and it don't need to share RAM with GPU... it is all unifed.

Again, Rubbish.

The Cell is a low-performance cheap processor as it's a chip going into a cost-sensitive device, the "graphics" processing can be done on any modern processor just as good or significantly better than the Cell.
Besides, most of the graphics effects the Cell does is usually frame-buffer effects and even games like Halo 3 on the Xbox 360 had that.

The PS4 can certainly do everything the PS3 can, it's faster and superior in every way. But, I beleive it could have still been better in the CPU, memory bandwidth and memory amount department, it's still slower than a several year old PC.