On Oct 23, 2008, at 5:48 PM, Simon Royal wrote: > A mate of mine has an 867Mhz PowerBook G4, the minimum for Leopard > and it > runs a dream on it. It should run more than fine on a 1.67Ghz.
The highest XBench score for a PowerBook 867 MHz running Leopard was 28.68. The corresponding highest Tiger score was 44.18. If XBench is a reliable metric, Tiger is 54% faster on average than Leopard. Whatever advantages Leopard may have, I don't think they're worth a 54% speed penalty. > Whatever you run it on, if you had Tiger on it previously you will > notice a > difference. My Intel iMac originally came with Tiger and it smoked > along, I > put Leopard on it and upped it from 1GB to 2GB RAM and it still > smoked, but > Leopard does require a lot of RAM to get the best out of it. The Intel iMac is the Mac used to standardize XBench 1.3, so under Tiger, which was the standard OS for XBench 1.3 the Intel iMac scores exactly 100.00. Some users ran XBench on their iMac under both Tiger and Leopard on the same day. Most of the Leopard scores were similar to user "J's iMac", which was 154.56 for Leopard. If the XBench scores are to be believed, the Intel iMac INCREASES in speed by 54% from Tiger to Leopard, while the 867 MHz G4 PowerBook DECREASES in speed by 54%. What a dramatic swing. This seems to cement my observation that Leopard is optimized for Intel, and perhaps even purposefully slowed down for PPC? The PowerMac G5 scores seem to echo this PPC slowdown. For a Late 2005 Quad 2.5GHz G5 the highest Leopard score I see is 172.11, but the highest Tiger score is 208.22. Not quite as bad as the G4, but still a DECREASE in Leopard for all PPC CPUs compared to an INCREASE in speed for all Intel CPUs. I'm suspicious. This sounds exactly like the "AMD vs Intel" lawsuit where code compiled on Intel compilers runs slow on AMD CPUs and fast on Intel CPUs. Something seems fishy here to me. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to Low End Mac's G-Books list, a group for those using G3 iBooks and PowerBooks (we run a separate list for G4 'Books). The list FAQ is at http://lowendmac.com/lists/g-books.html and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/g-books?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
