Buying new PowerBook, need information about processor speeds

mjfarsi

macrumors member
Original poster
Feb 1, 2005
85
0
I am planning on purchasing a new powerbook. I was wondering how does the G4 1.5 gHz processor compare to an intel that features more processing fee. How do you convert mac speed into pc speed? Any info will help
 

KingSleaze

macrumors 6502
Feb 24, 2004
410
0
So. Cal
mjfarsi said:
I am planning on purchasing a new powerbook. I was wondering how does the G4 1.5 gHz processor compare to an intel that features more processing fee. How do you convert mac speed into pc speed? Any info will help
Since the processor architectures are so different (pipeline lengths, number of instructions per clock cycle, etc), one method is to multiply the Mac clock speed by 20/7 (2.85714.....) to get a rough approximation of the processor power of the Mac compared to the megahertz (gigahertz) numbers that Intel is so proud of.
That number is based on the difference in processor architectures, however there can also be differences based on how well the program is optimized for a given operating system.
 
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mjfarsi

macrumors member
Original poster
Feb 1, 2005
85
0
So a Powerbook G4 1.5 would be equal to a 4.28 gHz Pentium !?!?!?!
 
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tdhurst

macrumors 601
Dec 27, 2003
4,162
269
Phoenix, AZ
Wait...

You just said you're getting a Mac, so why does it matter how mac/windows processor speeds compare? This question gets asked way too many times.
Just buy the fastest mac you can afford and you won't have any problems.
 
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Toreador93

macrumors regular
Sep 14, 2003
190
0
Whoa Whoa, just a minute.

Centrino != P4-m. Those are different. Centrino = P-M. The P4-m is just a slightly more efficient P4.

Second, there are comparisons on Barefeats that shows a 1.3 GHz P-M beating a 1.33 by a good margin. [hint: Centrino 1.8 = 1.3 as 1.8's didn't exist then]
 
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wwooden

macrumors 68000
Jul 26, 2004
1,999
150
Burlington, VT
It all comes down to the operating system. Mac OS X is just so efficient and easy to use that you actually save time and do more stuff. Also, the programs are better and far superior to anything on windows so you will enjoy using them.
 
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justinshiding

macrumors member
May 7, 2004
99
0
Chicago, IL
Toreador93 said:
Whoa Whoa, just a minute.

Centrino != P4-m. Those are different. Centrino = P-M. The P4-m is just a slightly more efficient P4.

Second, there are comparisons on Barefeats that shows a 1.3 GHz P-M beating a 1.33 by a good margin. [hint: Centrino 1.8 = 1.3 as 1.8's didn't exist then]
Slightly is an understatement. The pentium M is actually more efficient per clock cycle than the g4 (as your test supports) , but it now clocks up to 2.13 ghz....it's got a massive L2 cache (2mb) and a fairly zippy FSB (533 mhz.) It also has a speed stepping technology that allows to chip to actually run itself at slower clock speeds to conserve battery life....all in all it's a VERY nice chip [which cannot run os x.]

I've used the last rev of powerbooks a bit at the apple store testing them to see how fast they seem. I can say that if you're going to be using a laptop for anything that isn't super CPU intensive (normal stuff) then you'll have no issues. It becomes kind of doubtful if you're going to to do crazy video editing things or gaming...of course that's true of things in the PC world too. Laptops aren't built to be high end workstations.

Cheers,
Justin
 
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Passante

macrumors 6502a
Apr 16, 2004
860
0
on the sofa
Toreador93 said:
Whoa Whoa, just a minute.

Centrino != P4-m. Those are different. Centrino = P-M. The P4-m is just a slightly more efficient P4.

Second, there are comparisons on Barefeats that shows a 1.3 GHz P-M beating a 1.33 by a good margin. [hint: Centrino 1.8 = 1.3 as 1.8's didn't exist then]
After looking at those benchmarks I now want a powermac G5!
 
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Jaffa Cake

macrumors Core
Aug 1, 2004
19,802
7
The City of Culture, Englandshire
KingSleaze said:
Since the processor architectures are so different (pipeline lengths, number of instructions per clock cycle, etc), one method is to multiply the Mac clock speed by 20/7 (2.85714.....) to get a rough approximation of the processor power of the Mac compared to the megahertz (gigahertz) numbers that Intel is so proud of.
Maybe Apple should use this equation to massage the G5 processor speeds – it would certainly shatter the 3Ghz that everyone is clamouring for for the past year. ;)

So, we're currently at 2.5Ghz... anyone for a Dual 7.1Ghz G5? :D
 
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jxyama

macrumors 68040
Apr 3, 2003
3,735
1
i have a rev. A 12". it's a 867 MHz (with 640 MB RAM) and runs all my apps "fine." some apps could be faster, esp. like iMovie rendering or heavy filtering in PS, but when was the last time you used a PC with less than 1 GHz? it's now two yeas old and still going strong - i will have no problem using it for another few years until the machine physically dies, then i'll upgrade.

this should tell you how 1.5 GHz G4 will be.
 
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Jigglelicious

macrumors 6502
Apr 25, 2004
421
0
NYC
KingSleaze said:
Since the processor architectures are so different (pipeline lengths, number of instructions per clock cycle, etc), one method is to multiply the Mac clock speed by 20/7 (2.85714.....) to get a rough approximation of the processor power of the Mac compared to the megahertz (gigahertz) numbers that Intel is so proud of.
That number is based on the difference in processor architectures, however there can also be differences based on how well the program is optimized for a given operating system.
Uhh noooooo, you're way off track there. I don't know where you got that holy number to multiply the G4's clockspeed by, but its certainly not true. As a matter of fact, in all the testing that i've done to attempt to compare the speed of my PC to my Mac, it seems that the G4 runs about the same as a similarly clocked P4.

For example, my PC has a Athlon XP 3200+ (running at 2.2ghz). In all of my testing, the PC performs at twice the speed of my 1.4GHz G4, which is what one would expect from a 1.4GHz processor. There is nothing magical about the G4 that would make it run like a 3ghz P4 or Athlon. Actually, in terms of games, the G4 seems to run a bit *slower* than a similarly clocked PC, although this probably has more to do with Apple's immature OpenGL implementation and sloppy DirectX -> OpenGL porting.

Now, thats not to say that the G4 isn't fast. A G4 is still way more than enough power for most people who just browse the net and write a few emails. But don't expect miracles from it, either.
 
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vtprinz

macrumors 6502
Nov 30, 2004
395
0
jxyama said:
i have a rev. A 12". it's a 867 MHz (with 640 MB RAM) and runs all my apps "fine." some apps could be faster, esp. like iMovie rendering or heavy filtering in PS, but when was the last time you used a PC with less than 1 GHz? it's now two yeas old and still going strong - i will have no problem using it for another few years until the machine physically dies, then i'll upgrade.

this should tell you how 1.5 GHz G4 will be.
Ditto. I have a 2+ year old 800MHz G3 iBook (640MB RAM) and it still runs almost everything I need without a glitch. Unfortunately, however, I managed to get one of the books with the f#!@ up logic board so I don't know how much longer it's going to last. It's already been fixed twice, and I think I might get one more free fix out of apple before they start charging.

Without that in mind, the only reasoning I'm about to buy a new PM is because I've gotten heavily into photoshopping and audio work. The G3 is pretty slow in photoshop, so much so that I tend to take pictures in 5MP mode rather than the full 8MP's to save editing time. And forget RAW. It's useable for the occassional photo, but just takes forever. And with Logic/GarageBand, CPU overloads are all too common.

I'm starting to forget my point....

Anyway, we're talking about going from an 800MHz G3 to a 1.5GHz (or 1.67GHz) G4. If my outdated iBook can run everything I need (albeit a little slow on the heavy programs) than I can't imagine you'd have any problems with a PB




.........does this even have anything to do with this post? My mind is gone today...
 
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jxyama

macrumors 68040
Apr 3, 2003
3,735
1
Jigglelicious said:
Uhh noooooo, you're way off track there. I don't know where you got that holy number to multiply the G4's clockspeed by, but its certainly not true. As a matter of fact, in all the testing that i've done to attempt to compare the speed of my PC to my Mac, it seems that the G4 runs about the same as a similarly clocked P4.

For example, my PC has a Athlon XP 3200+ (running at 2.2ghz). In all of my testing, the PC performs at twice the speed of my 1.4GHz G4, which is what one would expect from a 1.4GHz processor. There is nothing magical about the G4 that would make it run like a 3ghz P4 or Athlon. Actually, in terms of games, the G4 seems to run a bit *slower* than a similarly clocked PC, although this probably has more to do with Apple's immature OpenGL implementation and sloppy DirectX -> OpenGL porting.

Now, thats not to say that the G4 isn't fast. A G4 is still way more than enough power for most people who just browse the net and write a few emails. But don't expect miracles from it, either.
well, basically, who cares about the "exact" conversion? i realize the orig. poster is asking for it, but to that, i say who cares? if he thinks that all the mac users are under massive disillusion of putting up with underpowered CPU and sluggish computers, he's vastly mistaken. whatever the clockspeed on apple computers, it performs as well as any PCs out there - we are not collectively putting up with "slow" machines for the sake of using macs.
 
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vtprinz

macrumors 6502
Nov 30, 2004
395
0
One more thing, even if the G4 measures slightly lower on bench tests than a P4 (or whatever), you have to remember that Apple makes the hardware, software, AND OS. Whether the processor is a little slower or not, the programs will run faster, as it's all optimized for your system and built to work seamlessly
 
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Alexandernap

macrumors newbie
Nov 14, 2004
18
0
Rochester NY
G4 vs P3M

I just got rid of an IBM Thinkpad with 1.3 p3M and replaced it with a 1ghz iBook. To compare the two is really difficult. I have no doubt that comparing the RAW processing speed of the P3M to the G4 is probably no contest, but this is really meaningless. OSX flows so much smoother than windows that, if anything, my iBook feels faster. As far as multitasking forget it. My iBook blows the doors off the IBM. I typically have 8 or 9 programs running including virtual pc, office, lotus notes, safari, and more on my iBook all day long. If I did that on my IBM something would be crashing sooner or later. All I can say is, to me there is no comparison because of OSX.
 
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