> I dunno about this new chip but the G4 benefits > from having a short (seven stage) pipeline. With > this redesign for higher clock rates, how deep is > the pipeline, and how will that hurt performance?
If the core is taken unchanges from the Power4 one, then it has 17 pipeline stages. Observe further that the P4 has indeed 28 stages, but at the second iteration of the same code from the instruction cache, the first 8 are skipped.
> It is unlikely (IMHO) that you'll be able to get
> OSX to boot on these... probably Darwin
Then you can also run the upper layers. THese
talk to the Darwin kernel. It's the idea behind
having OSX on unsupported machines
> OSX is pretty tied to the
> hardware. IIRC it used to check to make sure you
> didn't have bogus RAM (ie non-Apple approved) > installed.
oh no, that was an OpenFirmware Update, not OSX,
and - according to some sources - with a reason.
OS X is not guilty of that...
>I believe the comparison you are talking about is here: www.compaq.com/hpc/ref/ref_alpha_ia64.pdf [compaq.com]
>
>Better get it quick before it mysterisouly disappears like all other pro-Alpha/anti-IA64 material...
They mention also SMT, simultaneous multithreading, an alpha feature which will be part of future P4s. So Intel is already chewing parts of Alpha and using them to patch their architectures... them cannibals...
Roberto
Slashdot Mirror
> I dunno about this new chip but the G4 benefits
> from having a short (seven stage) pipeline. With
> this redesign for higher clock rates, how deep is
> the pipeline, and how will that hurt performance?
If the core is taken unchanges from the Power4 one,
then it has 17 pipeline stages. Observe further that
the P4 has indeed 28 stages, but at the
second iteration of the same code from the
instruction cache, the first 8 are skipped.
> Did you consider the P4 has dual processor cores per chip,
No, it doesn't. It has hyperthreading, which is completely different stuff.
"68K architecture may have 16 registers, but they are 16-bit"
Wrong! They *are* 32-bit wide registers.
Well, he could not know if he had to ASK or not until he posted...
If they can run Darwin, also the upper layer will probably run. It wasn't OSX that disabled "bogus RAM", but an OPen Firmware update.
> It is unlikely (IMHO) that you'll be able to get > OSX to boot on these... probably Darwin Then you can also run the upper layers. THese talk to the Darwin kernel. It's the idea behind having OSX on unsupported machines > OSX is pretty tied to the > hardware. IIRC it used to check to make sure you > didn't have bogus RAM (ie non-Apple approved) > installed. oh no, that was an OpenFirmware Update, not OSX, and - according to some sources - with a reason. OS X is not guilty of that...
>I believe the comparison you are talking about is here: www.compaq.com/hpc/ref/ref_alpha_ia64.pdf [compaq.com] > >Better get it quick before it mysterisouly disappears like all other pro-Alpha/anti-IA64 material... They mention also SMT, simultaneous multithreading, an alpha feature which will be part of future P4s. So Intel is already chewing parts of Alpha and using them to patch their architectures... them cannibals... Roberto