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You should tell that to Microsoft, Sun and other companies that use "x64" to cover both Intel and AMD systems.
People also use the term "bloodthinners" as do doctors and companies. This however is not a correct term because it does not exist, there is no such thing as something that makes your blood thinner. The proper term for this would be anticoagulentia and stops your blood from clotting. Just because some people use that term doesn't mean it's correct. Especially if their companies, marketing is not a department that gets it right.
Will a 32-bit program run on an x64 in long mode? No.
Will an x64 program run on an x86, or an x64 in 32-bit mode? No.
They are two different architectures which are not binary compatible.
LOL, you're making a big fool out of yourself right now because you now show that the diagram you used is even more flawed. If you want to go that way fine but then you also need to make a difference between x86 16 bit as we had with the 386 and you have to split up PowerPC since that came in 32 and 64 bit as did SPARC
Apart from that you're just plain wrong. Intel has made an instruction set and an architecture called x86. They have evolved it from the 8086 to 286, 384, 486 up to the Core 2 Duo cpu's we now know. The instruction set has been changed, they now use the one from the 386 or the 486 (also one of the reasons why the linux kernel dropped the 386 support). It's the exact same architecture we have had for years but it only evolved into something that is able to run 64 bit stuff. Also, the x86-64 cpu's that are out there can run 32 AND 64 bit software very nicely. That's what Leopard does (Leopard is 32 bit and has the ability to run 64 bit software on top of that) and what Snow Leopard will continue (will be 64 bit with the ability to run 32 bit software on top of that). Even Windows Vista and Windows 7 are able to do both. Why? Because the Intel and AMD cpu's support x86-64 since it's just a superset to x86. That's also the reason why x86-64 is NOT a different architecture!
Nearly everyone out there although some will use x64 which is wrong since that would imply it's a different architecture which it is not (it's an extension to x86 so x86-64 is the proper term).
Yes it does. It's no longer sold, but a version of XP for Itanium was released.
Ah, missed that one. Can see why they don't sell it anymore, it's not something you'd put on an Itanium machine.
It's NOT OLD TECHNOLOGY! Please, people.
Stop with this PowerPC is ancient slow technology.
Some of these machines were still sold less than 3 years ago.
PowerPC itself isn't old, IBM still uses it and is still actively developing new PowerPC cpu's and machines. Whatever Apple used is old, 3 years or even older to be more precise.
My G5s are faster than many of the first generation Intel Macs!
At a couple of things but the overall speed is a lot lower then the Intel Macs. The speed gains you have are not very spectacular since it makes a differences in seconds. You need to think in the amount of time it takes when you sneeze. Besides that, Leopard on those 3 year old (or even older) PowerPC Macs is slow as hell, not something you want.
Obviously, all the Intel people are tired of the PowerPC whining because they don't care and want their Intel Mac to run better.
When it comes down to performance I don't care what architecture my machines uses. SPARC64 is fine, x86 or x86-64 is great too and if PowerPC is the way to go then that'll do. The only thing I care about right now is the ability for me to use virtualisation on my Mac. That has become a possibility with the change to Intel's x86. If they were to switch to another architecture I need to find a solution, something like a dedicated x86 machine that runs something like ESXi 4.0.
The PowerPC stuff Apple used is now 3 years old, in 3 years a lot has happened on the cpu side. For example, 64 bit has become normal, every cpu out there has the 64 bit extension and there are 64 bit OS's for x86. Also speed has increased greatly due to multicore cpu's (as in octocore machines like the Mac Pro). You'd be a complete idiot if you ignored that development and still argued that the 3 year old PPC G5 cpu you have is still faster because it isn't. It's not about whining about old technology, it's about being real. PowerPC served us fine back then and now it's Intels turn. Most people really don't care, they just want something that works and that is also the biggest selling point of a Mac I have been hearing from the Mac people for years. In Dutch we know something called
"de wet van de remmende voorsprong" (translated into English). It means that you need to keep moving forward and not stop and relax because if you do then someone else will take the lead and make you obsolete. You either go bankrupt in that situation or you need to invest enormous amounts of money to get back in the race (a lot more then it would have been if you had stayed on top).
Yet only some of us are getting the Snow Leopard bug fixes and there are still PowerPC problems with 10.5.8
There are still a lot of things that need to be fixed for the Intel people as well. I've seen a lot of people still complain about certain aspects as you see with every update and every new OS X version. There will always be people who are disappointed because something still isn't working or something stopped working. That's unfortunately one of the biggest downsides to IT (both hardware and software).
For example, I still have problems with AFP on my Intel Macs though smb works great so I keep on using smb on my network (the problem being it does not seem to understand permissions whatsoever, if anyone has a solution do not hesitate, just scream!). It also has the added bonus of being crossplatform so Solaris, FreeBSD and Ubuntu can also get to my shared files and folders. With AFP I have to mess around with AppleTalk and such. Also spotted a problem regarding USB, one of the USB hubs I attached to my Mac mini 2009 dropped from usb2.0 to usb1.1. I had to unplug and plug it back in to get it back up to usb2.0 speeds. In the changelog they mention something about reliability fixes regarding USB so I think this might be caused by the update. I hope and believe it was just a "one time" thing which won't happen again.
When Leopard was released, it supported a Mac released in July, 2001!
Not really. It only supported the ones that could meet the system requirements and that ruled out a lot of the old Macs. The only ones left were the highend models with the highend graphics cards. I rather have it completely killed instead of supporting half the devices, that's just lame. You get all excited you can use Leopard and then you read the system requirements and then reality sinks in and you realize you can't install it because your Mac does not meet the system requirements. Yeah, great support for those old Macs...
I can't seem to attach pictures to emails since I applied the 10.5.8 update (neither dragging them in nor selecting them in the file open dialog). Is anyone else seeing this problem?
I tried adding pics using the photobrowser, it seems that it can add pics but it just doesn't do anything when you release the mouse button. Using the "attach" button does the same thing. Unfortunately this also happens with pdf files

I do have some mailbundles installed but removing them does not resolve the problem. Big problem if you can't attach anything to your mail. Rebuilding Mail did not resolve it, deleting nearly everything but the bundles did not resolve it, so I tried deleting every plist file there was in ~/Library/Preferences for Mail and then start from scratch (luckily it still remembered the signatures, messages, todo's and notes) and that resolved the problem finally!