Apple recently tweaked Aluminum iMacs' hardware (IMO)

I bought one of the new iMacs a little over a month ago and had two problems with it. First, I encountered the infamous display freezing problem after the 1.1 update. Second, the SuperDrive became toast.
WIth a little prodding, Apple sent me a brand new one (same model and BTO options) while allowing me a few days before returning the old one. I've observed the following differences between the two.
· When I ran Software Update on the new machine, it didn't present the 1.1 update or the Keyboard update. I suspect these have already been applied at the factory. The new machine is perfectly reliable - no freezes, screen artifacts, etc.
· Apple has a new source for RAM. The old machine's 1GB module had a darker-colored circuit board and no manufacturer branding. The new machine has a lighter-colored unit made by "hynix Korea" (sic).
· The new machine is a bit noisier. The fans are noticeable (though barely), and all Hard Drive access is audible (but highly muffled). The old machine was completely whisper-quiet.
· The new machine's SuperDrive performs a brief mechanical function whenever the computer is powered-on. It also has more pronounced servo noises when inserting or removing a disk.
· The new machine is noticeably faster. Boot-up, already pretty speedy on the old machine, now happens in the blink of an eye. OS X overall performance seems snappier.
My first point makes me suspect that the 1.1 freezing problem might have a hardware component to it after all. And all of my observations lead me to believe that Apple has been tweaking the new iMacs' hardware.

I have had my new iMac now for 7 Weeks and had no freezes etc.
When the 1.1 update was available I downloaded it and worked better, for example the system became nippier.
Interesting what you say about the memory modules, As I examined the 2 1Gb modules that I took out a couple of weeks ago and replaced them with 2X 2GB modules I noticed that they are indeed the ones named "hynix Korea". The iMac is quiet with no apparent noise but with a very slight hum. However the superdrive does have a prounced servo noise when I remove or insert a disk.

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http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore?productLearnMore=M93 19G/A
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http://www.techradar.com/reviews/computing/monitors-projectors/monitors/apple-23 -inch-cinema-display-225702/review

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