ddtlm said:
Yeah it makes more heat than most chipsets, but as the Xserve clearly shows no heat pipes are needed to cool it, just a passive heatsink with some air movement, not unlike other chipsets in 1U rackmounts. The nine fans are for the entire system.
Some air movement? The xServe is nearly constantly blown, active cooling. It was back when there were G4s under the hood, and it's not exactly gotten cooler with the addtion of G5s and the new subsystems. Also, the xServe has no hot GPU, which is getting to be a major factor in many systems.
Unlike the comparison that many people wish to make, the PowerBook is far more cramped and would be using much less available power and airflow. It's not all a proof that you could make a PowerBook when you compare something that's over twice as big, on a wall outlet or other steady power supply, and able to use outside cooling solutions (rack's often have secondary thermal systems).
The chip in PBooks and iMacs need not be clocked as high (slower FSB's, even 1/3 multipliers instead of 1/2), nor does it need to support two FSB's, nor two channels of memory. These "hot" components are therefore half the size and clocked lower, so obviously heat would come down a lot. More than they would like in a laptop probably, but still a whole heck of a lot less expensive than designing a mostly new processor and the system controller to go with it.
And also a whole heck of a lot less performance capable. In case you missed the discussion, I advise you to go look up barefeat's test of the single 1.5 G4 versus the single 1.6 G5 on Final Cut. Here's a hint... It very nearly gets beaten, in a desktop environment with all those things that you're talking about ditching.
So you think they ought to cut performance lower than the current systems, just to have a G5 under the hood with less battery life?
If Apple is footing the bill I find this no more likely, as I've outlined before. Instead of "why would IBM do it", the question I would ask is "why would Apple do it".
Simple. If Freescale doesn't deliver on the e600s or e700s, then Apple has a replacement processor ready to run as soon as IBM can tool a line for them. If they go to tape-out and hold there, with the design ready to go on wafer, they have a backup plan and damage control.
It's been explained by MacPhisto as protection against Moto screwing up, which is about the only justification because obviously a 750vx goes head to head with the 74x7 chips and the upcoming e600. But the 750vx was supposed to show in March, that's what, 6 months behind when Moto delivered? So if Moto slipped more than 6 months from their already slow schedule the 750vx would "save the day". (So... how much did Apple supposedly spend on this?)
Does that really matter (the cost), as long as they're looking out for their customer's interests? People have accused Apple of just taking whatever Motorola hands over, and this looks like a case of their hedging bets against a possible repeat of bad circumstances.
But what about this doomsday Apple was saving themselves from possibly encountering? Consider the case where Moto dropped the ball on the 7457 (more than 6 months late) and where they had no 750vx under development. With no more difficulty that they would have designing new motherboards and chipsets for a 750vx, Apple could have been putting G5's into PBooks and iMacs starting as soon as the 970fx was available, Feb 2004 according to schedule I believe.
Except that it still takes a redesign of logic boards, and a complete redo of their power and heat management scheme. It could even be that the G5 is impossibly at current heat levels and the form factor, and Apple's been known for their sleek laptops. They're not goin to kill that just to wedge in a processor that isn't clearly a better performer in those highly limited circumstances.
Also, it could very well be that the "dropped ball" is what convinced them they needed this backup plan.
They could leave iBooks with either 180nm G4's or with G3's, and eMacs with 180nm G4's. The G5's in some PBooks (like the 12") would be quite low clocked, but hey we're pretending the 7457 never showed so they'd be replacing slow G4's. So, not a terribly bad situation for Apple if they never funded a 750vx and Moto dropped the ball.
Except, you know, the whole G5 not outperforming the G4 thing when you cut the bus and get low enough clock. Even a full-bus, desktop G5 doesn't outrun the 7447A at 1.5ghz by all that much. If Freescale delivers a dual-core 2.0ghz e600 that Apple can use, or the VX debuts at 2.0ghz, and their total heat budget is around 20-30w, that's still far,
far better than the 970fx.
So lets summarize what you're claiming: Apple bankrolled the development of a 750vx that competes as directly as can be with processors Moto was developing, just to make sure that if Moto slipped by more than six months, they could madly scramble together some new chipsets and motherboards and save their hide... from using the 970fx and G3's. Oh and then Apple cut funding, so all that money was wasted. But IBM didn't mind because apparently they didn't have any other customers waiting for this chip, or designing products around its fancy new FSB. Whew, quite a clever plan!
Mind not being quite so insulting?
The obvious point of the VX is to
have the option to produce it if necessary, because Motorola does have a history of making promises they can't back up. Even if it isn't used right away, Apple could sell the rights to the chip or the IP genereated from it later on, or bring it into play if there are problems in the future. Direct competition is not suicide, as IBM has proved with the G5, and which
you have stated already by talking about how the 970 will eventually be some low-power solution that can be used where the G4 is.
Why is the G5 not a stupid investment, then, since it's obviously attacking a market that Motorola has a lock on. Hell, why isn't the PowerPC a stupid investment for desktops? AMD and Intel have that all sewn up, after all!
So you figure that PPC/Linux would be compelling enough to defeat x86/Linux and x86/Windows?
Take a look at today's announcement from IBM, if you would. Aside from some commodity parts, the entire machine is provided by Big Blue. It's not at all beholden to Intel or Microsoft for anything.
As with all things, it will scale down eventually.
The only way to do that is to undercut on price because its pretty damn easy to have a "fast enough" desktop system, and people will default to what they already have laying around.
Incorrect. Undercutting is one way to do things, but offering a superior product is another. Chevy sells a lot of cars, but so do BMW and Porsche. The
only reason I'm using the car analogy is on pricing and features, in this case, not performance, though that's gotten pretty comparable lately.
Ever look at IBM's desktop prices? Last time I checked Dell had them beat, and they would be all over x86/Linux the second Linux started looking like a desktop money maker.
That's buying parts from outside. There's no volume discount like doing your own manufacturing and providing your own processors.
Them and about a zillion other companies, big and small. Your expecting IBM to take on the entire x86-box industry, and defeat them on price, while keeping two processor lines up to date. I'm not seeing the profit.
I'm expecting IBM to start the revolution, with the help of AMD, Apple, and others who have a vested interest in Intel going down. Notice who's working together on HyperTransport, have we? How about the partners in PowerPC and the companies that are buying onto the platform (which IBM owns, incidentally, not Motorola)?
Here's a list for you:
Hypertransport - AMD, Apple, Cisco, Transmeta, Broadcom, Sun, nVidia, ATI, Agilent, VIA, PMC, TexasInstruments, NEC, IBM
PowerPC - Apple, AMD, Sony, Freescale, Nintendo
The PowerPC list isn't immediately as eyedrawing, nor is there an easy-to-find partner list like there is for Hypertransport. However, there is some serious clout behind both movements. Some might say worrying clout, if you're Intel or Microsoft.
Oh but maybe IBM has a clever plan to sell expensive PPC/Linux desktops. Heh.
Why's that so terrible an idea? Linux distributions are increasingly becoming commercial ventures for the companies that provide enterprise-grade support. It could even be argued that OS X is the forerunner of the movement, a graphical *nix that runs on PowerPC hardware and isn't vulnerable to all of the Windows headaches.