Luke from iFixit.com was kind enough to test out a new NVIDIA-based MacBook Pro with 8GB of RAM (two 4GB chips) to see if the earlier reports were true. NVIDIA representatives had stated that the new chipsets used in the MacBook and MacBook Pro could support up to 8GB of RAM. Previous generation MacBook Pros could only reliably support up to 4GB of memory.
Preliminary results show that while the new MacBook Pro did recognize the entire 8GB of RAM, during actual usage, the computer appeared to be limited to 4GB:
The machine would hit an invisible wall at 4GB and act like it had run out of memory. In the larger screenshot, two instances of Parallels can be seen (both set to 2GB of RAM). The second instance, however, only occupies a small portion of RAM expected. It’s unclear why this limitation exists, as Mac OS X is able to use more than 4GB on Apple’s Mac Pro. As a result, MacBook and MacBook Pro owners should not expect to be able to upgrade to 8GB of RAM at this time.
iFixit has posted a disassembly guide for the new MacBook Pros including RAM replacement and will post updates about these results after further testing.
It is possible that Apple has locked in the restriction of 4GB of memmory awaiting the release of Snow Leopard. As a sells pitch of sorts. Upgrade to Snow Leopard for $129 and unlock the capability of 8GB of memmory on your MacBook Pro Late 2008 model.
Will just have to wait and see what happens, if anything.
The other day I updated my system from Mac OS X 10.5 to 10.5.1 and ever since my Apple Wireless Keyboard has been randomly disconnecting and reconnecting every few minutes. I have tried changing the batteries, resetting the keyboard, repairing, etc. but am still having the same issues. I hit up the Apple Support Discussions and found hundreds of other users reporting the same problem and I am convinced that this is an issue caused by the last software update.
Thread 1
Thread 2
After some testing on my own to see what I could do to fix the problem I have come to the conclusion that there is some interference from the bluetooth connection and my Airport connection. After disabling my airport and using the wired connection for hours I have had no problems.
Apple, please get this issue resolved soon. I don’t like being all tangled up in wires.
UPDATE: Just wanted to give everyone an update on how I fixed the issue. I found that I have a new wireless network in my area now, which I believe was set to the same channel as my router. I went into my router settings and changed my wireless channel from 6 to 9 and applied the change. I haven’t had a problem since. Apple suggested that I buy a Airport basestation because it supports more then the 2.4GHz spectrum. This would also fix my problem, but for $200. 
I just went and took the Mac OS X Support Essentials v10.4 Exam ( since 10.5 isn’t out yet 
) and PASSED! So I’m now officially an Apple Certified Help Desk Specialist, and on my way to being a Certified Desktop and Portable Technician!
One of 10.5’s new features that I use quite often is the built-in screen sharing. You can use screen sharing from iChat, which is great for family tech support, but I’m referring specifically to screen sharing in the Finder. With multiple machines in the house, I often want to see the screen on a given machine while seated at another. In the pre-10.5 days, this was doable, and not overly difficult—you had to click a couple buttons to enable things, then run a VNC viewer app to make the connection. But with 10.5, the viewer is now built into the system. Screen sharing is based on Apple’s full Remote Desktop package, which offers more control over exactly how remote screens are shared. Luckily for us, Apple left at least some of that functionality in the more-limited screen sharing application—it’s just disabled by default. Read more »
