Xenon or CELL..

[nAo]

..or both?
A couple of new interesting patents show something that may be related to CELL-PPE and Xenon CPU.

Power throttling method and apparatus
Just look at the first picture, we see a blocks diagram that could resemble the PPE.

Multithreading recycle and dispatch mechanism

system and method is provided for improving throughput of an in-order multithreading processor.

[EDIT] Obviously, as it already happened a lot if times, in a few hours these patents will appear on Team Xbox (or some other site) as they found it first without giving credit to anyone nor linking this site

 

[j^aws]

Ah 'cmon...we all know by now that the CELL PPE and one Xenon CPU core are half-brothers!

 

[version]

i think m$ dont use a 2 way,inorder cpu
2 G5 with 8 way,and OOO faster than 4 PPE

 

[pc999]

Anyone have performance numbers for the PPE alone?

 

[j^aws]

i think m$ dont use a 2 way,inorder cpu
2 G5 with 8 way,and OOO faster than 4 PPE

Not for vector ops per cycle...

2 G5s ~ 2*VMX ~ 16 Flops per cycle

4 beafed up Xe PPE's ~ 4*VMX ~ 32 Flops per cycle.

 

[version]

i think m$ dont use a 2 way,inorder cpu
2 G5 with 8 way,and OOO faster than 4 PPE

Not for vector ops per cycle...

2 G5s ~ 2*VMX ~ 16 Flops per cycle

4 beafed up Xe PPE's ~ 4*VMX ~ 32 Flops per cycle.

peak performance not equal real performace,
g5 can to run 8 instructions/cycle with MT , PPe only 2 instructions/cycle

 

[j^aws]

i think m$ dont use a 2 way,inorder cpu
2 G5 with 8 way,and OOO faster than 4 PPE

Not for vector ops per cycle...

2 G5s ~ 2*VMX ~ 16 Flops per cycle

4 beafed up Xe PPE's ~ 4*VMX ~ 32 Flops per cycle.

peak performance not equal real performace,
g5 can to run 8 instructions/cycle with MT , PPe only 2 instructions/cycle

Yes but now you're not being consistent...

2*G5~ 16 instructions per cycle

4*PPE~ 8 instructions per cycle

Obviously they have their pros and cons but I was comparing vector Flops per cycle...and this is why CELL kicks ass with it's vector performace.

 

[one]

i think m$ dont use a 2 way,inorder cpu
2 G5 with 8 way,and OOO faster than 4 PPE

Not for vector ops per cycle...

2 G5s ~ 2*VMX ~ 16 Flops per cycle

4 beafed up Xe PPE's ~ 4*VMX ~ 32 Flops per cycle.

peak performance not equal real performace,
g5 can to run 8 instructions/cycle with MT , PPe only 2 instructions/cycle

Doesn't the leaked Xenon document say its CPU is 2-issue?

 

[j^aws]

i think m$ dont use a 2 way,inorder cpu
2 G5 with 8 way,and OOO faster than 4 PPE

Not for vector ops per cycle...

2 G5s ~ 2*VMX ~ 16 Flops per cycle

4 beafed up Xe PPE's ~ 4*VMX ~ 32 Flops per cycle.

peak performance not equal real performace,
g5 can to run 8 instructions/cycle with MT , PPe only 2 instructions/cycle

Doesn't the leaked Xenon document say its CPU is 2-issue?

It's says dual-issue,

...
The Xenon CPU is a custom processor based on PowerPC technology. The CPU includes three independent processors (cores) on a single die. Each core runs at 3.5+ GHz. The Xenon CPU can issue two instructions per clock cycle per core. At peak performance, Xenon can issue 21 billion instructions per second.
...

http://www.beyond3d.com/forum/viewtopic.php?t=13470

 

[j^aws]

Anyone have performance numbers for the PPE alone?

1 PPE being 2 way SMT, dual-issue ~ VMX + FPU ~ 8+2 ~ 10 Flops per cycle

The VMX can do FMADD but I'm assuming the FPU can do an FMADD also, i.e. FMADD ~ 2 Flops per cycle.

 

[version]

Anyone have performance numbers for the PPE alone?

1 PPE being 2 way SMT, dual-issue ~ VMX + FPU ~ 8+2 ~ 10 Flops per cycle

The VMX can do FMADD but I'm assuming the FPU can do an FMADD also, i.e. FMADD ~ 2 Flops per cycle.

read it
http://www.powermax.com/pdf/G5_WP.pdf

 

[j^aws]

Anyone have performance numbers for the PPE alone?

1 PPE being 2 way SMT, dual-issue ~ VMX + FPU ~ 8+2 ~ 10 Flops per cycle

The VMX can do FMADD but I'm assuming the FPU can do an FMADD also, i.e. FMADD ~ 2 Flops per cycle.

read it
http://www.powermax.com/pdf/G5_WP.pdf

Uhg...15 pages...I'm lazy!

Quick questions,

G5 = 1*VMX + 2*FPU ?

PPE = 1*VMX + 1*FPU ?

Can FPUs in both G5 and PPE do FMADD?

 

[version]

G5= 2 VMX+2FPU
PPE=1VMX+1FPU

 

[j^aws]

G5= 2 VMX+2FPU
PPE=1VMX+1FPU

G5 has 2 VMX units!

This is a single G5 core, right? Now I have to read that! <shakes fist>

 

[version]

G5= 2 VMX+2FPU
PPE=1VMX+1FPU

G5 has 2 VMX units!

This is a single G5 core, right? Now I have to read that! <shakes fist>

"PowerPC G5 uses a dual-pipelined Velocity Engine optimized with two independent queues"

 

[j^aws]

G5= 2 VMX+2FPU
PPE=1VMX+1FPU

G5 has 2 VMX units!

This is a single G5 core, right? Now I have to read that! <shakes fist>

<shakes fist even harder>

That's BS!

Check the diagram on page 8, it clearly shows 1 VMX unit! So,

G5 = 1*VMX + 2*FPU

 

[version]

G5= 2 VMX+2FPU
PPE=1VMX+1FPU

G5 has 2 VMX units!

This is a single G5 core, right? Now I have to read that! <shakes fist>

<shakes fist even harder>

That's BS!

Check the diagram on page 8, it clearly shows 1 VMX unit! So,

G5 = 1*VMX + 2*FPU

1 VMX unit but with dualpipeline

 

[j^aws]

G5= 2 VMX+2FPU
PPE=1VMX+1FPU

G5 has 2 VMX units!

This is a single G5 core, right? Now I have to read that! <shakes fist>

<shakes fist even harder>

That's BS!

Check the diagram on page 8, it clearly shows 1 VMX unit! So,

G5 = 1*VMX + 2*FPU

1 VMX unit but with dualpipeline

That's still 1 VMX unit and NOT 2 VMX units.

How do you know that VMX unit in the G5 is different to the VMX unit in the PPE? And the VMX unit is still ~ 8 Flops per cycle right?

 

[Lazy8s]

While you're busy deciding between Xenon or CELL, it'll end up being Revolution.

 

[version]

G5= 2 VMX+2FPU
PPE=1VMX+1FPU

G5 has 2 VMX units!

This is a single G5 core, right? Now I have to read that! <shakes fist>

<shakes fist even harder>

That's BS!

Check the diagram on page 8, it clearly shows 1 VMX unit! So,

G5 = 1*VMX + 2*FPU

1 VMX unit but with dualpipeline

That's still 1 VMX unit and NOT 2 VMX units.

How do you know that VMX unit in the G5 is different to the VMX unit in the PPE? And the VMX unit is still ~ 8 Flops per cycle right?

i dont know , G5 too complicated, i mean G5's VMX up to 12 or 16 flops/cycle