Yousuf, I've also heard that the Xbox360 CPU lacks branch prediction and speculative execution. Is this true? It's obvious Microsoft is deliberately keeping everyone in the dark about the exact specs on this processor. Probably because they don't want anyone to know how feeble it really is.
I don't know, but I would assume that it would actually cost them extra
R&D money to remove the branch prediction stuff, so it's not likely.
Quote:
I beleive I saw benchmarks last year (SpecINT, SpecFP) of various Athlon 64 systems that beat out the G5's.
Might be due to the fact it uses a smaller L2 cache (1MB shared between
the three cores).
On Thu, 21 Sep 2006 20:18:54 GMT, "pigdos" <NA@nowhere.com> wrote:
Quote:
When I read the Xbox 360 official, marketeering garbage it makes their CPUseem like a supercomputer. I know it's based on the PowerPC architecture,but which generation of the PowerPC architecture? How does it compare to thelatest Intel/AMD CPU's?Does each 360 core have all the features of 6th generation (or is it 7thgeneration) CPU's (for example, branch prediction, out-of-order execution,speculative execution)? Does the 360 have a 64-bit data path or 128-bit? Ihave looked for this kind of information, but found nothing but Microsofthype/marketeering.
No matter what it is you'll never be able to use it for anything but
xbox, and that one for nothing else but running whatever is sold for
it. You won't be able to boot Windows on it unless Bill Gates orders
his guys to recompile WinXP/Vista for xbox - the hell will freeze over
sooner. Maybe some hacks will figure out how to boot Linux on it -
but with PC prices plummeting why would anyone need it?
In article <1158929287.741082.143470@h48g2000cwc.googlegroups. com>, yjkhan@gmail.com says...
Quote:
pigdos wrote:
Quote:
Yousuf, I've also heard that the Xbox360 CPU lacks branch prediction and speculative execution. Is this true? It's obvious Microsoft is deliberately keeping everyone in the dark about the exact specs on this processor. Probably because they don't want anyone to know how feeble it really is.
I don't know, but I would assume that it would actually cost them extra R&D money to remove the branch prediction stuff, so it's not likely.
No it wouldn't. A couple of fuses or register bits, a small amount
of logic, and you're all set. These sorts of things are normal (to
disable features during chip bringup).
Quote:
I beleive I saw benchmarks last year (SpecINT, SpecFP) of various Athlon 64 systems that beat out the G5's. Might be due to the fact it uses a smaller L2 cache (1MB shared between the three cores).
Um, the "G5" (PPC-970MP) doesn't have three cores, nor a shared
cache. There are two cores, each with a 1MB L2.
Thanks Tony, this is exactly the kind of information I was looking for and
couldn't find.
--
Doug
"Tony Hill" <hilla_nospam_20@yahoo.ca> wrote in message
news:582eh2t4dkcdh5vk4f2pgn14e9jt5r8t96@4ax.com...
Quote:
In case anyone wants some more info, I came across this IBM page describing the XBox360 CPU: http://www-128.ibm.com/developerwor...nxw09XBoxDesign It's quite a good overview with a reasonable amount of technical details and very little marketing fluff. ------------- Tony Hill hilla <underscore> 20 <at> yahoo <dot> ca
Didn't yhou just say the 360 had two cores? Sigh, I guess you get the booby
prize as well then...
--
Doug
"krw" <krw@att.bizzzz> wrote in message
news:MPG.1f7d178ad22173a59899d1@news.individual.ne t...
Quote:
In article <1158876987.454832.77950@m7g2000cwm.googlegroups.co m>, yjkhan@gmail.com says...
Quote:
pigdos wrote:
Quote:
When I read the Xbox 360 official, marketeering garbage it makes their CPU seem like a supercomputer. I know it's based on the PowerPC architecture, but which generation of the PowerPC architecture? How does it compare to the latest Intel/AMD CPU's?From what I've read about it in the past, it's a version of the core
that they used inside the last generation of PPC Macintoshes, the G5. It has 3 of those cores, but probably a smaller cache than the G5 did. Those are just what I read in the past, and no I don't have any links for it.
Bzzzt! Wrong answer. Here is your consolation prize... -- Keith
Didn't yhou just say the 360 had two cores? Sigh, I guess you get the booby prize as well then...
Try and read what Keith said. He clearly indicated that the latest
MPUs for the G5s are dual core, with 1MB cache each. Notice how this
is different (i.e. not the same as) the MPU in the Xbox360.
Considering that Keith actually works at IBM, there's a pretty good
chance he has just a little bit more insight into the MPU that you
might.
There was a presentation at the Fall Processor Forum on the Xbox360.
Using Google will help, I guarantee. If I can find it, so can you...
Didn't yhou just say the 360 had two cores? Sigh, I guess you get the boobyprize as well then...
Try and read what Keith said. He clearly indicated that the latest MPUs for the G5s are dual core, with 1MB cache each. Notice how this is different (i.e. not the same as) the MPU in the Xbox360. Considering that Keith actually works at IBM, there's a pretty good chance he has just a little bit more insight into the MPU that you might. There was a presentation at the Fall Processor Forum on the Xbox360. Using Google will help, I guarantee. If I can find it, so can you... DK
I also believe there is a process technology difference as well.
--
Del Cecchi
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Xbox 360 CPU: hype or reality?
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