Xbox2 cpu performance?

[bbot]

Does anyone know what the computational power of Xbox2 cpu is, based on the leaked specs?

 

[version]

Does anyone know what the computational power of Xbox2 cpu is, based on the leaked specs?

168 GIPS
84 GFlops

 

[Nightz]

Does anyone know what the computational power of Xbox2 cpu is, based on the leaked specs?

168 GIPS
84 GFlops

Compared to Athlon 64?

 

[version]

about 30 Gflops(?)

 

[bbot]

How did you calculate that figure of 84Gflops? Doesn't sound that great, only 84Gflops, not 100's of Gflops.

 

[Megadrive1988]

Xenon CPU is not likely to have massive performance like PS3 CPU.


Xenon CPU is estimated in the dozens of Gflops.

PS3 CPU is expected to be in the hundreds of Gflops.

 

[jvd]

Is it only in the dozens of flops ? I thought they were saying it was in the low 100 gflops ?

Anyway its best to see what both can actually sustain .

 

[akira888]

3.5 Billion clock cycles per second (or 3.5Ghz)
3 cores
1 Altivec unit (or whatever IBM calls it) per core
4 way SIMD on the Altivec unit
2 operations per FPU (FMADD)
-------
84 GFLOPs

 

[Megadrive1988]

Is it only in the dozens of flops ? I thought they were saying it was in the low 100 gflops ?

Anyway its best to see what both can actually sustain .

the Xbox 2 CPU, the only thing Ive ever read is that it'll be in the 84 to 90 Gflop range. not low hundreds of Gflops. and true, it's all about what a CPU can sustain,

 

[swaaye]

That Xbox2 CPU sounds like an absolute beast. I'll be shocked if the PS3's Cell CPU just totally outguns it. Cell is completely unproven, PowerPC sure is proven and pretty refined I'd imagine.

 

[bbot]

Expectation, PS3 cell processor: four Gigaflops (Based on slide which shows "home server" with 4 cells, "home server"= apparently the deluxe version of PS3)

Which is probably why Sony turned to Nvidia to design a powerful gpu.

 

[rabidrabbit]

Four Gigaflops??? Isn't that less than PS2 (isn't PS2 6.4 Gigaflops??) and xbox!!! !! SONY Suxxas!!!

 

[jvd]

Is it only in the dozens of flops ? I thought they were saying it was in the low 100 gflops ?

Anyway its best to see what both can actually sustain .

the Xbox 2 CPU, the only thing Ive ever read is that it'll be in the 84 to 90 Gflop range. not low hundreds of Gflops. and true, it's all about what a CPU can sustain,

When i said low hundreds of g flop range i didn't mean 200gflops or something . I mean like 120gflops

 

[j^aws]

Expectation, PS3 cell processor: four Gigaflops (Based on slide which shows "home server" with 4 cells, "home server"= apparently the deluxe version of PS3)

Which is probably why Sony turned to Nvidia to design a powerful gpu.

I hope your not wasting anyone's time with that 4Gflops crap. You do know that the current EE in the PS2 ~ 6Gflops, right?

I did some estimates here,

http://www.beyond3d.com/forum/viewtopic.php?p=430908#430908

In Gflops for 1 Cell and tri-core Xe CPU,

PS3 (CPU = 294 + GPU= 480) 2.4x > Xe (CPU = 84 + GPU = 240)

Anyway what does it matter right? It's all about the games? If your're a graphics whore then why don't you wait for all the consoles to be released then by the most powerful!

 

[jvd]

Well, with the scaling calcs I did earlier with leaked specs etc,

Xe CPU(tri-core) = 84 GFlops @ 3.5GHz, 65nm (IBM)
Xe GPU = 240 GFlops @ 500Mhz, 90nm (TSMC)

PS3 CPU(1 CELL) = 294 GFlops @ 4.6GHz, 65nm (STI)
PS3 GPU = 480 GFlops @ 500MHz, 65nm (STI)

Where did u get gpu leaked specs from ?

Do you believe nvidia has the advantage in flops ? I highly doubt this is the case .

IN the pc sector the newly designed nv40 is trading blows with a modified r3x0 chip (the r420)

Not only that but u assume that the xe gpu is going to be on 90nm ? Why do you believe this to be the case ?

 

[j^aws]

Well, with the scaling calcs I did earlier with leaked specs etc,

Xe CPU(tri-core) = 84 GFlops @ 3.5GHz, 65nm (IBM)
Xe GPU = 240 GFlops @ 500Mhz, 90nm (TSMC)

PS3 CPU(1 CELL) = 294 GFlops @ 4.6GHz, 65nm (STI)
PS3 GPU = 480 GFlops @ 500MHz, 65nm (STI)

Where did u get gpu leaked specs from ?

Do you believe nvidia has the advantage in flops ? I highly doubt this is the case .

IN the pc sector the newly designed nv40 is trading blows with a modified r3x0 chip (the r420)

Not only that but u assume that the xe gpu is going to be on 90nm ? Why do you believe this to be the case ?

All my assumptions are in that linked thread so I do not want to rehash them. If you follow the link back, you'll find more info.

As for the Xe GPU, it's from the original leaked diagram.

IIRC, there are 48 ALUs and each ALU can do 8 vector ops and 2 scalar ops simultaneously per clock cycle.

1 ALU = 10 flops per clock cycle.
48 ALUs = 480 flops per clock cycle.

Xe GPU @ 500Mhz = 0.5x480 = 240 GFlops.

 

[jvd]

I will have to look in that thread for the info i guess.


But anyway why do u assume that ati is going to decrease its clock speed ?

If the rumoured R500 Xenon GPU will have 48 unified ALUs from the leaked specs and is suspected to be manufactured on 90nm process, then I would expect the nVidia GPU to have 64 ALUs on a 65nm process and with a good dose of eDRAM. ...And possibly 2x32 pipeline configurations...though I couldn't tell you the benefits of 1x64, 2x32, 4x16 for what they would want to achieve with CELL, any guesses?

Your basicly just playing pocket pool

 

[j^aws]

I will have to look in that thread for the info i guess.


But anyway why do u assume that ati is going to decrease its clock speed ?

If the rumoured R500 Xenon GPU will have 48 unified ALUs from the leaked specs and is suspected to be manufactured on 90nm process, then I would expect the nVidia GPU to have 64 ALUs on a 65nm process and with a good dose of eDRAM. ...And possibly 2x32 pipeline configurations...though I couldn't tell you the benefits of 1x64, 2x32, 4x16 for what they would want to achieve with CELL, any guesses?

Your basicly just playing pocket pool

Huh, I never said anything about ATI reducing clockspeed! :? Like I said, my assumptions are in that thread.

 

[jvd]

I will have to look in that thread for the info i guess.


But anyway why do u assume that ati is going to decrease its clock speed ?

If the rumoured R500 Xenon GPU will have 48 unified ALUs from the leaked specs and is suspected to be manufactured on 90nm process, then I would expect the nVidia GPU to have 64 ALUs on a 65nm process and with a good dose of eDRAM. ...And possibly 2x32 pipeline configurations...though I couldn't tell you the benefits of 1x64, 2x32, 4x16 for what they would want to achieve with CELL, any guesses?

Your basicly just playing pocket pool

Huh, I never said anything about ATI reducing clockspeed! :? Like I said, my assumptions are in that thread.

YOu have the xenon gpu listed at 500mhz that is a decrease in clock speeds .

X800xt pe is 520 . The x850 is what 560 ? Why would they go down ?

 

[Guden Oden]

Isn't this topic rather redundant? We're just regurgitating things we already know. No, actually, we're regurgitating things we've already SPECULATED!

We don't really KNOW anything, including if nextbox CPU will be 3.5GHz or Cell 4.6GHz, how many altivec units or PUs there will be, etc. And we definitely don't know how fast the GPUs will be clocked or how their internals will be arranged!