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Current version by: Dan ,

Text:

First I would strongly recommend upgrading your firmware Here's a link to the Apple TN that explains it all and were to download the newest for your system [http://support.apple.com/kb/HT1237?viewlocale=en_US&locale=en_US|EFI & SMC firmware updates for Intel-based Macs].
 
As to the needed memory: 256 MB, 512 MB, or 1 GB SDRAM in SO-DIMM's
 
• 200-pin
 
• PC-5300 DDR2 667 MHz
 
For a max of 4GB per Apple and with the latest EFI third parties have proven 8GB is supportable.
 
Using faster modules 1066MHz or 1333MHz can be used but the bus logic will not run any faster than 667 MHz MacBooks (older MacBookMacBook Pro's run at 1066MHz).
Using faster modules 1066MHz or 1333MHz can be used but the bus logic will not run any faster than 667 MHz MacBooks (older MacBookMacBook Pro's run at 1066MHz).
 
So why do some systems have problems? This is do to how the memory modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and the altered speed interfered with it. Heres a bit more on the problem (which also effects MacBooks) [http://www.softnology.biz/tips_macbookpro.html|Ensuring backward compatibility between DDR3-1333 modules and Macbook Pro]
 
There was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs.
There was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs.
 
The reason this became needed was the older slower memory modules became difficult to get even for Apple ;-} So they needed to make the system able to support the more popular modules. And besides people thought the systems speed would improve with the faster modules (1066MHz & 1333MHz).

Status:

open

Edit by: Dan ,

Text:

First I would strongly recommend upgrading your firmware Here's a link to the Apple TN that explains it all and were to download the newest for your system [http://support.apple.com/kb/HT1237?viewlocale=en_US&locale=en_US|EFI & SMC firmware updates for Intel-based Macs].
 
As to the needed memory: 256 MB, 512 MB, or 1 GB SDRAM in SO-DIMM's
 
• 200-pin
 
• PC-5300 DDR2 667 MHz
 
For a max of 4GB per Apple and with the latest EFI third parties have proven 8GB is supportable.
 
Using faster modules 1066MHz or 1333MHz can be used but the bus logic will not run any faster than 667 MHz (MacBookMacBooks (older MacBook Pro's run at 1066MHz).
Using faster modules 1066MHz or 1333MHz can be used but the bus logic will not run any faster than 667 MHz (MacBookMacBooks (older MacBook Pro's run at 1066MHz).
 
So why do some systems have problems? This is do to how the memory modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and itthe altered its speed when it shouldn'tinterfered with it. Heres a bit more on the problem (which also effects MacBooks) [http://www.softnology.biz/tips_macbookpro.html|Ensuring backward compatibility between DDR3-1333 modules and Macbook Pro]
So why do some systems have problems? This is do to how the memory modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and itthe altered its speed when it shouldn'tinterfered with it. Heres a bit more on the problem (which also effects MacBooks) [http://www.softnology.biz/tips_macbookpro.html|Ensuring backward compatibility between DDR3-1333 modules and Macbook Pro]
 
There was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs. The

The
reason this became needed was the older slower memory modules became difficult to get even for Apple ;-} So they needed to make the system able to support the more popular modules. And besides people thought the systems speed would improve with the faster modulesmodules (1066MHz & 1333MHz).
There was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs. The

The
reason this became needed was the older slower memory modules became difficult to get even for Apple ;-} So they needed to make the system able to support the more popular modules. And besides people thought the systems speed would improve with the faster modulesmodules (1066MHz & 1333MHz).

Status:

open

Edit by: Dan ,

Text:

First I would strongly recommend upgrading your firmware Here's a link to the Apple TN that explains it all and were to download the newest for your system [http://support.apple.com/kb/HT1237?viewlocale=en_US&locale=en_US|EFI & SMC firmware updates for Intel-based Macs].
 
As to the needed memory: 256 MB, 512 MB, or 1 GB SDRAM in SO-DIMM's
 
• 200-pin
 
• PC-5300 DDR2 667 MHz
 
For a max of 4GB per Apple and with the latest EFI third parties have proven 8GB is supportable.
 
Using faster modules can be used but the bus logic will not run any faster than 667 MHzMHz (MacBook).
Using faster modules can be used but the bus logic will not run any faster than 667 MHzMHz (MacBook).
 
So why do some systems have problems? This is do to how the memory modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and it altered its speed when it shouldn't. Heres a bit more on the problem (which also effects MacBooks) [http://www.softnology.biz/tips_macbookpro.html|Ensuring backward compatibility between DDR3-1333 modules and Macbook Pro]
 
There was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs. The reason this became needed was the older slower memory modules became difficult to get even for Apple ;-} So they needed to make the system able to support the more popular modules. And besides people thought the systems speed would improve with the faster modules.
There was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs. The reason this became needed was the older slower memory modules became difficult to get even for Apple ;-} So they needed to make the system able to support the more popular modules. And besides people thought the systems speed would improve with the faster modules.

Status:

open

Edit by: Dan ,

Text:

First I would strongly recommend upgrading your firmware Here's a link to the Apple TN that explains it all and were to download the newest for your system [http://support.apple.com/kb/HT1237?viewlocale=en_US&locale=en_US|EFI & SMC firmware updates for Intel-based Macs].
 
As to the needed memory: 256 MB, 512 MB, or 1 GB SDRAM in SO-DIMM's
 
• 200-pin
 
• PC-5300 DDR2 667 MHz
 
For a max of 4GB per Apple and with the latest EFI third parties have proven 8GB is supportable.
 
Using faster modules can be used but the bus logic will not run any faster than 667 MHz.
 
So why do some systems have problems? This is do to how the memory modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and it altered its speed when it shouldn't. Heres a bit more on the problem (which also effects MacBooks) [http://www.softnology.biz/tips_macbookpro.html|Ensuring backward compatibility between DDR3-1333 modules and Macbook Pro]
So why do some systems have problems? This is do to how the memory modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and it altered its speed when it shouldn't. Heres a bit more on the problem (which also effects MacBooks) [http://www.softnology.biz/tips_macbookpro.html|Ensuring backward compatibility between DDR3-1333 modules and Macbook Pro]
 
There was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs.

Status:

open

Edit by: Dan ,

Text:

First I would strongly recommend upgrading your firmware Here's a link to the Apple TN that explains it all and were to download the newest for your system [http://support.apple.com/kb/HT1237?viewlocale=en_US&locale=en_US|EFI & SMC firmware updates for Intel-based Macs].
 
As to the needed memory: 256 MB, 512 MB, or 1 GB SDRAM in SO-DIMM's
 
• 200-pin
 
• PC-5300 DDR2 667 MHz
 
For a max of 4GB per Apple and with the latest EFI third parties have proven 8GB is supportable.
 
Using faster modules can be used but the bus logic will not run any faster than 667 MHz.
 
So why do some systems have problems? This is do to how the modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and it altered its speed when it shouldn't. ThereHeres a bit more on the problem (which also effects MacBooks) [http://www.softnology.biz/tips_macbookpro.html|Ensuring backward compatibility between DDR3-1333 modules and Macbook Pro]

There
was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs.
So why do some systems have problems? This is do to how the modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and it altered its speed when it shouldn't. ThereHeres a bit more on the problem (which also effects MacBooks) [http://www.softnology.biz/tips_macbookpro.html|Ensuring backward compatibility between DDR3-1333 modules and Macbook Pro]

There
was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs.

Status:

open

Original post by: Dan ,

Text:

First I would strongly recommend upgrading your firmware Here's a link to the Apple TN that explains it all and were to download the newest for your system [http://support.apple.com/kb/HT1237?viewlocale=en_US&locale=en_US|EFI & SMC firmware updates for Intel-based Macs].

As to the needed memory: 256 MB, 512 MB, or 1 GB SDRAM in SO-DIMM's

• 200-pin

• PC-5300 DDR2 667 MHz

For a max of 4GB per Apple and with the latest EFI third parties have proven 8GB is supportable.

Using faster modules can be used but the bus logic will not run any faster than 667 MHz.

So why do some systems have problems? This is do to how the modules communicate their speed and how the system logic interprets it. In this case the NVIDIA GeForce 9400M also accesses the system memory and it altered its speed when it shouldn't. There was a firmware bug which broke the override but that has now been fixed. If you do encounter problems there is a utility that you can run to reprogram the memory modules bus speed to comply to the systems needs.

Status:

open