Forums
New posts
Articles
Product Reviews
Policies
FAQ
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Menu
Log in
Register
Install the app
Install
Forums
Other Apple Products
Other Hardware and Peripherals
What the Megahertz Myth means
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="StarManta" data-source="post: 22396"><p>We're all aware that a 1.0 GHz G4 is not the same as a 1.0 GHz Pentium. I found this information some of you may find useful:</p><p></p><p><em>Both the Athlon and Pentium 4 use longer pipelines (long and thin) with simple stages whereas the PowerPC G4s use shorter pipelines with more complex stages (short and fat). This is the essence of the so called "megahertz myth". A CPU with a very high clock speed may not be any faster than a CPU with a lower clock speed. The Pentium 4 is now at 3.2 GHz yet a 1.25 GHz Alpha can easily outgun it on floating point operations.</em></p><p><em></em></p><p><em>The longer pipelines allow the x86 CPUs to attain these very high frequencies whereas the PowerPCs G4s are somewhat restricted because they use a smaller number of pipeline stages and this limits the clock frequency.</em></p><p><em></em></p><p><em>The amount of voltage the CPU can use restricts the power available and this effects the speed the clock can run at, x86 CPUs use relatively high voltages to allow higher clock rates, to boost clock speeds further, power hungry high speed transistors are used. A long thin pipeline is very fast but also very inefficient power wise. All these things add up so a 3GHz CPU may be fast but are also very power hungry with maximum power consumption rates now approaching or even exceeding 100 Watts. Intel in fact have taken to using a much lower frequency part for laptop computers than the top end Pentium 4. Yet, despite the fact it is only 1.6GHz, the Pentium M performs just as well as the 2.2GHz Pentium 4.</em></p><p></p><p>Bottom line: The "Pentium" style of processing takes more power than the "PowerPC" style, but tend to be cheaper. In other words, that 3GHz laptop is almost certainly faster than your 1.33 GHz Powerbook, but wouldn't last very long on batteries.</p><p></p><p><a href="http://www.osnews.com/story.php?news_id=3997" target="_blank">http://www.osnews.com/story.php?news_id=3997</a></p></blockquote><p></p>
[QUOTE="StarManta, post: 22396"] We're all aware that a 1.0 GHz G4 is not the same as a 1.0 GHz Pentium. I found this information some of you may find useful: [i]Both the Athlon and Pentium 4 use longer pipelines (long and thin) with simple stages whereas the PowerPC G4s use shorter pipelines with more complex stages (short and fat). This is the essence of the so called "megahertz myth". A CPU with a very high clock speed may not be any faster than a CPU with a lower clock speed. The Pentium 4 is now at 3.2 GHz yet a 1.25 GHz Alpha can easily outgun it on floating point operations. The longer pipelines allow the x86 CPUs to attain these very high frequencies whereas the PowerPCs G4s are somewhat restricted because they use a smaller number of pipeline stages and this limits the clock frequency. The amount of voltage the CPU can use restricts the power available and this effects the speed the clock can run at, x86 CPUs use relatively high voltages to allow higher clock rates, to boost clock speeds further, power hungry high speed transistors are used. A long thin pipeline is very fast but also very inefficient power wise. All these things add up so a 3GHz CPU may be fast but are also very power hungry with maximum power consumption rates now approaching or even exceeding 100 Watts. Intel in fact have taken to using a much lower frequency part for laptop computers than the top end Pentium 4. Yet, despite the fact it is only 1.6GHz, the Pentium M performs just as well as the 2.2GHz Pentium 4.[/i] Bottom line: The "Pentium" style of processing takes more power than the "PowerPC" style, but tend to be cheaper. In other words, that 3GHz laptop is almost certainly faster than your 1.33 GHz Powerbook, but wouldn't last very long on batteries. [url]http://www.osnews.com/story.php?news_id=3997[/url] [/QUOTE]
Verification
Post reply
Forums
Other Apple Products
Other Hardware and Peripherals
What the Megahertz Myth means
Top