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Check CPU speed settings on iMac G5s
It might be worth noting, that doing this on a PowerBook 15" 1.5Ghz causes a loud buzzing noise:See this thread on the Apple Discussions.
This is from one of my postings on that topic. Anyone know where I can find some info about CHUD tools? I have XCode already installed and I can't seem to find out... I did some performance testing and found this: I ran XBench processor benchmarks, and the numbers showed a huge difference (higher is better): Reduced: 91.94 Automatic: 96.47 Highest: 183.31 I ran the benchmarks several times, and got consistant results. According to this, it would seem there was almost a 100% difference in processor performance. I ran the "Altivec Fractal Carbon" benchmark, using single processor settings and 131k maximum colors (smaller time and higher MFLOPS is better): Reduced: 121.8 seconds - 3192.9 MFLOPS Automatic: 60.6 seconds - 6413.1 MFLOPS Highest: 60.3 seconds - 6452.1 MFLOPS I did a "real world" test using Eclipse 3.0, and Tomcat. Using Eclipse to start my development apps in Tomcat (lower is better): Reduced: 19000ms Auto: 11000ms Highest: 11000ms I ran this test several times each to make sure that caching was not effecting too much, and results were consistant. I am not sure how "processor constrained" this process is, but you can see that comparing "reduced" to other settings - there is an impact. So based on my comparison, one benchmark says there is a pronounced difference between "Automatic" and "Highest" but another and real world performance seems to say otherwise. I don't know what the official answer is, but it looks as though the performance difference in real use is negligible - but the noise difference is wonderful. :)
Check CPU speed settings on iMac G5s
CHUD is not installed by default with developer tools. It's an extra package you have to select.
Check CPU speed settings on iMac G5s
Check out page 38 of MacAddict's December Mag for some real-world benchmarks. The Proc set to highest wins in almost every catagory; over qautomatic. It is also interesting to note the comparison to a 1.8Ghz PowerMac G5.
Check CPU speed settings on iMac G5s
Well, I don't have the magazine in front of me (I'll have to check it out when I can) and they don't have their articles on their website. But in their forums, they have a thread discussing the article, and one of the posters had about the same experience as mine when they tested their machine. Check out this post.
Your mileage may vary. But all I know is that my Powerbook makes a VERY ANNOYING noise when set to "Highest" so I keep it at "Automatic" for my own sanity, and I have not noticed a difference in my usage. And I use my PowerBook 15 hours a day. :)
Check CPU speed settings on iMac G5s
I haven't really run any benchmarks per se, myself. My experience has been that it does not "feel" any faster during normal operation; ie word, photoshop, iTunes. However, as I posted in the original thread, when running Battlefield 1942 it runs dog slow at 640 x 480 when set to automatic. Setting it to highest yeilds much better performance. Nanosaur 2 does not show any difference. My guess is that some programs and games don't cause the processor to ratchet up like it should. There is no doubt that the fans run louder, though; as they should with the proc running hotter. |
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