The PowerPC G4 was a lie?!

Bob Bobeck

macrumors newbie
Original poster
May 20, 2012
3
0
Just read this, says that the G4 was just a pumped-up 603.

I'm still runnin a dual 1.42 Power Mac G4 FW 800 with Leopard 10.5.8.

Wtf??? Is Apple screwin our eyes out???
 

adcx64

macrumors 65816
Nov 17, 2008
1,227
42
Philadelphia
That site is blatantly false. You can even see someone commented at the bottom making corrections. The G4 is built on a completely different architecture, the 7xxx series, not the 60x.
 

Intell

macrumors P6
Jan 24, 2010
18,883
373
Inside
I love how he calls AltiVec questionable. It's as if he doesn't even know what it can really do. Even now days people are still impressed by its power.
 

adcx64

macrumors 65816
Nov 17, 2008
1,227
42
Philadelphia
I love how he calls AltiVec questionable. It's as if he doesn't even know what it can really do. Even now days people are still impressed by its power.
My point exactly. The guy obviously has a limited understanding of the architecture.
 

Whargoul

macrumors member
Apr 27, 2012
65
1
Denver
"Below I'll give some historical background, technical information, and plain facts that support my claim that the PowerPC G4 is really a second-generation processor, and the broader notion that the PowerPC family has not evolved significantly since 1995"

So, the clean-sheet design G3 that could significantly beat a 604 of much higher MHz was not a new generation?
 

goMac

macrumors 604
Apr 15, 2004
7,063
1,087
All PowerPCs are related, so I'm sure somewhere the G4 is related to the 603. Not really that big a deal.

As a developer, I can tell you that Altivec is very hard to take advantage of. It simply doesn't work in a lot of cases. However, Intel has shipped something extremely similar to Altivec since the Pentium 2 called SSE, which really got powerful in the Pentium 4. So we didn't really lose Altivec with the Intel transition, in fact the same library is still in the system, but now it uses SSE, and SSE is also extremely fast.

So in the end, because Intel has the same technology, I don't know if Altivec ended up being that big of a pro for the PowerPC.
 

Zotaccian

macrumors 6502a
Apr 25, 2012
637
2
G4 was based on G3:

http://www.xlr8yourmac.com/g3cards/xlr8g4/g4vsg3.html

The design philosophy on MPC7400 is to change from the MPC750 base only where required to gain compelling multimedia and multiprocessor performance. MPC7400's core is essentially the same as the MPC750's, except that whereas the MPC750 has a 6-entry completion queue and has slower performance on some floating-point double-precision operations, MPC7400 has an 8-entry completion queue and a full double-precision FPU. MPC7400 also adds the AltiVec instruction set, has a new memory subsystem (MSS), and can interface to an improved bus, the MPX bus. The following sections discuss the major changes in more detail.

When looking at benchmarks, it is quite obvious that G4 didnt stand a change against PC's with same or even bit lower priced PC's:

http://www.digitalvideoediting.com/2002/05_may/features/cw_aeshowdown.htm

I also find clock for clock comparisons worthless since it was Motorolas problem that it couldn't ramp up the clock speed the same way Intel and AMD could and when PC's were still cheaper or similarly price I think the only one who had problems was Apple. It was extremely wise choice to move to Intel.

PS. I own both Intel based MBP and G5 based iMac.
 

bax2003

macrumors 6502a
Dec 25, 2011
903
139
Serbia
However, Intel has shipped something extremely similar to Altivec since the Pentium 2 called SSE, which really got powerful in the Pentium 4. So we didn't really lose Altivec with the Intel transition, in fact the same library is still in the system, but now it uses SSE, and SSE is also extremely fast.
First CPU with SSE instruction was Pentium III (Slot 1, Katmai), followed by Coppermine......not Pentium 2.
 

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