Upgrading Memory to 6Gb RAM

I am currently considering to install a memory upgrade in my 17 inch 2.4 Ghz Core 2 Duo "Merom" MacBook Pro. I have read the tutorial on this site where it states that I can choose 1 2GB block and 1 4Gb block and everything should be fine. However Mactracker on my MacBook Pro reports that 6Gb can be installed, but only 4GB will be used by the Mac. Precisely it states:

Maximum Memory 6.0 GB (Actual) 4.0 GB (Apple)

So my question is: Can I actually upgrade to 6Gb of usable RAM in this machine?

Update

FYI:

The MBP (A1229) has now been performing flawlessly with the upgrade to 6Gb RAM for 9 months. There has not been one single issue that could be attributed to the upgrade (or any other issues for that matter, this machine has been remarkably stable since I bought it in october 2007). I have not run any tests (like Geekbench), as I have no data from the machine before the upgrade. Judging from my daily use however, I would estimate an increase in performance of approximately 60 to 75%. I am now considering an upgrade to a 250GB SSD and will hopefully be able to post results from this upgrade in the near future.

Answer this question I have this problem too

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Haven't tried with 2x4GB, but it is apparently it's not possible for the A1229 to address more than 6GB:

http://www.powerbookmedic.com/xcart1/?ca...

It would be interesting to test though, I will try to locate a proper technical reference to make the case clear.

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If I remember correctly the Penryn North Bridge chip had a problem way back then and was limited to 6GB. Intel did issue a fixed version but I don't think Apple ever altered the firmware as the risk of someone with the older chip could have problems. Which is why you need a mixed set.

Unlike the video RAM allocation issue in the older MacBook models, there you could only address 3 GB of 4 GB installed but in that case using a matched set gave you interleaved memory if you could installed a pair of 2 GB modules and yet still could access the limit of 3 GB.

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Supports 667 MHz PC2-5300 DDR2 SDRAM.

Standard RAM: 2 GB Maximum RAM: 6 GB*

Details: 2 GB installed as two 1 GB modules. No slots free.

*Apple officially supports a maximum of 4 GB of RAM but third-parties have been able to upgrade the system to 6 GB of RAM using one 2 GB and one 4 GB memory module.

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Thanks a bunch for the prompt answer, my main concern is that upgrading to 6Gb using unmatched RAM (not 2x3GB) will affect the systems stability. I would be very pleased if anyone has a comment about this.

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You lose interleaving by having unmatched pairs but the off set of more RAM makes that of little consequence. I haven't seen any reports of system instability with unmatched pairs.

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Thanks a lot, will order 4GB block ASAP

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did it work?

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The MacBook Pro A1229 performs flawlessly with the 6GB RAM. Not a single problem has experienced, that can be ascribed to this setup.

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My system works with 6GB (one 2 GB & one 4 GB).

I wonder if it's possible to use in 8GB - two 4 GB modules?

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Please check out there very helpfull comment from Dan, in you wan't an in-depth explanation. the short answer is: No, this is not possible due to the firmware. 6 GB is max.

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Claus Hopstock will be eternally grateful.
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