Is there a new G4 that supports DDR SDRAM?

Is there a new G4 that supports DDR SDRAM?

[Conn Clark]

Hello All,

	Apple just released there new Macs with DDR SDRAM support. Does that
mean there is a new G4 that supports DDR SDRAM ? Apple has to be using a new
G4 because they claim a 1.25GHz clock speed and a 166MHz FSB clock rate.
Any body heard anything about this?

Just currious,

	Conn
--

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Conn Clark
Engineering Stooge				clark@esteem.com
Electronic Systems Technology Inc.		www.esteem.com


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Re: Is there a new G4 that supports DDR SDRAM?

[Roland Dreier]

>>>>> "Conn" == Conn Clark <clark@esteem.com> writes:

    Conn> Apple just released there new Macs with DDR SDRAM
    Conn> support. Does that mean there is a new G4 that supports DDR
    Conn> SDRAM ? Apple has to be using a new G4 because they claim a
    Conn> 1.25GHz clock speed and a 166MHz FSB clock rate.  Any body
    Conn> heard anything about this?

For "G4" PPC chips (really Motorola 74xx) the RAM controller is on a
separate companion chip.  For example Marvell's Discovery 2 companion
chip supports DDR and works with Mororola 74xx and IBM 750 chips.

However, the fastest Motorola 7455 chips I've heard of are 1 GHz with
a 133 MHz bus.  Perhaps the new Macs are using CPUs available only to
Apple?

 - Roland

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Re: Is there a new G4 that supports DDR SDRAM?

[Tom Rini]

On Fri, Aug 16, 2002 at 10:02:40AM -0700, Roland Dreier wrote:

> However, the fastest Motorola 7455 chips I've heard of are 1 GHz with
> a 133 MHz bus.  Perhaps the new Macs are using CPUs available only to
> Apple?

Well, once someone gets one, we might find out what the PVR is.  I
suppose it's possible there's new 7455's that are just a tad faster, or
maybe it's a new rev (7456? with all the previously known errata
fixed..)

--
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

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