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Asher
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Calgary, Alberta
Nov 1999 time: 22:21
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Cloud9, don't patronize me. I know all about MHz.
It's stupid to assume MHz is speed, it's also stupid to assume it's not speed. It's a major factor in speed. CPU speed is determined by MHz * IPC (Instructions Per Clock), for the most part. Memory bandwidth and latency also plays a part, but the G4 doesn't compete there either (you can have 4.2GB/s on high end PCs, vs 1.0GB/s on Macs for bandwidth).
The Pentium 4's clockrate is abnormally high, and its IPC is lower than the G4s and Athlons, but MHz * IPC is still way, way higher than the G4 and also higher than the Athlon's.
The 2.4GHz P4 totally and completely dominates a Dual 1GHz G4 in every benchmark thrown at it (even Photoshop), so how badly do you think a single G4 700 or 800 will do?
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Jon Miller
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Have you ever heard of reality?
Jon Miller
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Jon Miller
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I was refering to Cloud9
Jon Miller
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Mr. Nice Guy
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"I'm gonna speak softly, but carry a BIG STICK!!!"
Mar 2002 time: 23:21
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quote: Originally posted by Asher
Cloud9, don't patronize me. I know all about MHz.
It's stupid to assume MHz is speed, it's also stupid to assume it's not speed. It's a major factor in speed. CPU speed is determined by MHz * IPC (Instructions Per Clock), for the most part. Memory bandwidth and latency also plays a part, but the G4 doesn't compete there either (you can have 4.2GB/s on high end PCs, vs 1.0GB/s on Macs for bandwidth).
The Pentium 4's clockrate is abnormally high, and its IPC is lower than the G4s and Athlons, but MHz * IPC is still way, way higher than the G4 and also higher than the Athlon's.
The 2.4GHz P4 totally and completely dominates a Dual 1GHz G4 in every benchmark thrown at it (even Photoshop), so how badly do you think a single G4 700 or 800 will do? |
Then explain to me why AMD's "slower" processors outperform Intel's "faster" processors. 
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Asher
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Calgary, Alberta
Nov 1999 time: 22:21
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quote: Originally posted by Cloud9
Then explain to me why AMD's "slower" processors outperform Intel's "faster" processors. |
Argh. I'm going to try this one more time.
There are two main factors in overall CPU performance.
MHz -- this is the clockrate, expressed in terms of millions of cycles per second.
IPC -- this is how many instructions the CPU can executed for every clock rate (every Hz)
The Pentium 4 has a lower IPC than the Athlon, which has a lower IPC than the G4.
The Pentium 4 has a higher MHz rating than the Athlon, which has a higher MHz than the G4.
Neither IPC nor MHz alone is the true indicator of performance. Apple will tell you IPC is, Intel Marketing will tell you MHz is.
Real performance is expressed in terms of IPC * MHz (instructions per clock times how many clockcycles).
The fastest Athlons do not outperform the fastest Pentium 4s, rather the fastest Pentium 4s are faster. Doing less IPC means you can turn up the MHz.
Now, an Athlon at 500MHz will outperform a Pentium 4 at 500MHz. A G4 at 500MHz will outperform a Pentium 4 at 500MHz and an Athlon at 500MHz. But they're not all normalized for that speed.
When you take into account IPC * MHz, the Pentium 4 is fastest, Athlon second fastest, and the G4 way behind somewhere. 
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Jon Miller
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the thinkpads are known to be outrageously expensive
Jon Miller
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Asher
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Calgary, Alberta
Nov 1999 time: 22:21
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How wonderful of PCMag to do their research.
The new PowerBooks are $3199US.
They have a G4 800MHz, 512MB PC133 SDRAM, 40GB HD, 15.2" screen capable of 1,280x854, CD-RW/DVD-ROM combo drive, and Radeon 7500 graphics.
A Dell Inspiron 2650 gives you a P4 1.6GHz, 512MB DDR266 SDRAM, 40GB HD, 15" screen capable of 1600x1200, CD-RW/DVD-ROM combo drive, and GeForce 2 Go (32MB) graphics. This is for $2,446.00.
Customize it on the Dell site yourself. 
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