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Jan 30 2013
By: JonathanCarabalo Lombax Warrior 220 posts
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Playstation 4 architecture

8 replies 338 views Edited Jan 30, 2013

We've got many different possible paths to take.  We've definitely got an AMD "Jaguar"-based CPU, which is in fact, a slightly modified version of the Bobcat, which has the following features:

 

8 cores

1.6 ghz per core

512 Kbytes per core

.25 nm process, soon to be .20 nm

2 128-bit SIMD units per core

2 ALU units per core

2 Load-store Units per core

440 million transistors total

4 MB L2 cache

2.8 mm^2 per core, without cache

 

 

It is a multi-core, dual-issue, super-scalar, out-of-order processor.  Which can issue out-of-order load-store instructions as well.  It has a directly addressable L2 cache, 1/0th of which can be locked and programmer controlled.  A Least Recently Used L2 cache program.  Don't let its slow speed and size fool you!  It can issue and retire 2 instructions per clock.  It features 90% of the performance of AMD's K8 architecture (at similar clockspeed), despite its being 1/2 the size.  Pretty remarkable.  The Bobcat is the same - 90% of AMD's K8 (Athlon 64, Athlon 64 x2), although about 5/7ths the size in transistors.  AMD classes it as an ultra-portable CPU - but it offers performance which is better then Athlon 64 and Athlon 64 x2.  Which are larger. 

 

It's extremely small - 2.8 mm^2 per core - the Jaguar core.  How that tiny processor can even compete is remarkable.  Virtually no heat dissiptation.  Thus - the Playstation 4 will be small.  It has 8 times the transistors that the Playstation 3's CPU does, and 4 times the transistors of Xbox 360's CPU - both of which are in-order and vastly simpler.  I estimate that this CPU will be 15 times faster then the Playstation 3's and 5 times fasater then the Xbox 360's CPU.  Not bad considering it runs at half the clockspeed, is very cheap, and is ultra portable.

 

As for the rest of the GPU - we're talking a built-in frame and z-buffer, via SRAM.  That's excellent.  A free 109 GB/s of memory bandwidth - cheap too.  That's memory with non-destructive reads and writes, with no refresh.  A free 109 GB/s of memory bandwidth, with free anti-aliasing.  

 

What are some other possibilities?  We can make the on-chip Vector Co-Processor for the Playstation 4 take many different forms.  A massive SIMD array with little cache.  Fully pipelined with no individual memory bus, or with a memory bus.  I say we give it its own 8 MB L2 cache, connect it to the main CPU, and give it 10 128-bit SIMD FMADD pipelines.  A write-gather pipe.  That'd be something.     

 

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Treasure Hunter
Registered: 04/05/2009
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Re: Playstation 4 architecture

Jan 30, 2013
I honestly think you are a copy-paste spambot.

Smiley Indifferent
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Ghost of Sparta
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Re: Playstation 4 architecture

Jan 30, 2013

He's posting with intent on spreading disinformation for the sole purpose of leaving us underwhlemed when it arrives.

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Fabulous!
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Splicer
Registered: 12/14/2010
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Re: Playstation 4 architecture

Jan 30, 2013
You people are so incorrect.

Sony WILL NEVER USE x86.

Not in a MILLION YEARS! It's all about the revolution of Cell BE.
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Lombax Warrior
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Re: Playstation 4 architecture

Jan 31, 2013

Thus we've got an extremely efficient, yet extremely powerful, CPU.  It's almost like a star.  I'll nickname its CPU - "The Sun".

 

Playstation 4 CPU - "The Sun"

 

Physical parameters:

600 million transistors

25 NM process

1.6 ghz

4 MB L2 cache total

8 cores

 

Instruction execution:

Out-of-Order Execution

An Out-of-order Load/Store unit (a world's first)

Micro-Op support - an enhanced x86 feature, load, execute, and stores with just 1 instruction

Super-scalar, multi-core, multi-processor design

2 Execution engines per core, Two instructions issued per clock

2 64-bit FP execution units - doubled for Playstation 4

 

Branch prediction:

Accurate branch predictor

Two branches predicted per clock

A limited number of branches within branches taken

 

L2 cache:

Last Recently Used L2 cache scheme, with 10% of it directly addressable and lockable (techncially a world's 2nd, but actually 1st)

 

What's the result of all these optimizations you ask?  At 1/3 the transistor count of the AMD 64 architecture, K8, it performs at 90% of its performance.  How on earth did they achieve such extreme optimization?  

 

Like I said - extremely efficient, extremely streamlined, yet extremely powerful. 

 

 

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Sackboy
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Re: Playstation 4 architecture

Jan 31, 2013

if they wait two months it'll be outdated...lolz.Smiley Wink i spent $3000 on my gaming computer w/ top of the market products in 2011...it's now obviously a dinosaur.Smiley LOL

/)/)
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Fender Bender
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Re: Playstation 4 architecture

Feb 1, 2013

Actually top of the line products in 2011 still perform quite nicely; and obviously aren't dinosaur parts.

In 2011 a recommended GPU for monster computers ($3000), would be a card like the 6990.

That part still edges out many GPU's these days.  

 

Old CPU's are also very capable in games, especially if you are spending a lot of money at the time.  

There is a reason Phenom's and Athlons are still being tossed in budget gaming rigs.  

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Treasure Hunter
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Re: Playstation 4 architecture

Feb 1, 2013
I can't justify spending 3 grand on a Desktop or Laptop PC. Or even 1 grand. Even 500.

I'm happy with my desktop made out of scavenged parts (two of the hard disks were from my inventory of scrap) and an old laptop that I got for free. Smiley Tongue They're good enough for the stuff I use PCs for.
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Sackboy
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Re: Playstation 4 architecture

Feb 1, 2013

I play Ultra-HD Flight Simulater, i also have heavy duty film and video editing software (final cut pro HD studio's- it's outdated- because in 2012 apple introduced Final Cut X "a new package") I also have a few other big $$$ software on my computer... i love my NVIDIA graphics card. i also had to have an expensive processor for 3D graphics generation in Blender, and i use autocad for engineering purposes. i've filled up a Lacie 1TB external HDD with "raw" video footage and 3D movies i created in Blender. I need all the best of the best products to keep up w/ what all i do.

 

 

/)/)
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