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Memory

Boot Camp: PC Won't Recognize More than 2GB of RAM

There was a time when some Boot Camp users encountered problems with the installed Windows system not recognizing more than 2GB of RAM - even if the Mac had substantially more than that installed. The reasons for this RAM limit can vary by Windows version...

RAM Compatibility: Substituting PC-133 for PC-100

PC-133 and PC-100 RAM modules are backwards compatible. Higher speed memory modules always default to the highest CAS latency rating at slower speeds. For example, a PC-133 CL3 (3-2-2) chip will run at either PC-100 or PC-66, CL2 (2-2-2). If you purchase ...

RAM: PC-133 RAM (CL2 vs. CL3)

Legacy SDRAM modules for older Macs utilize a small programming chip called the Serial Presence Detect (SPD). This chip tells the computer what it is, and how it should be used. It has Primary, Secondary, and Tertiary programming for CLx settings. In most...

Mac: Large RAM Upgrades Can Increase Startup Times.

As a general rule, adding more RAM to a system that has only a few gigabytes installed, can improve the overall responsiveness of your operating system and applications. However some customers notice that once a large amount of RAM has been installed into...

RAM: Installation Videos

If you need assistance installing your memory (RAM) upgrade kit, OWC offers detailed installation videos for a wide variety of Mac models. Please use the link below to find your specific Mac video. http://eshop.macsales.com/installvideos/ [http://eshop....

RAM: Intel Macs - Pairing RAM Modules

Generally, any iMac, non-Retina MacBook, or non-Retina MacBook Pro, or Mac Mini from the last several years should allow RAM modules of the same spec but different capacities to be installed in any of the RAM slots in the computer. There is no specific or...

Mac: Startup - 3 Repeating Beeps

If your Mac is sounding 3 successive beeps with a five second pause in between, it means the RAM in your computer has not passed the data integrity test run at startup. https://support.apple.com/en-us/HT202768 [https://support.apple.com/en-us/HT202768] ...

RAM: Diagnostic Software Tests

Generally the best software-based RAM test you can use for your Mac is the one built into Apple's AHT (Apple Hardware Test) suite. To learn more about the AHT, go to https://support.apple.com/en-us/HT201257 [https://support.apple.com/en-us/HT201257] ...

RAM: How Much Do I Need?

Unfortuntely there is no one correct answer to this question. It depends directly on the specific Mac you're using, the operating system you're running on that Mac, and the specific software applictions you run from day to day. While Apple lists only 2G...

RAM: ECC Errors

ECC (stands for Error Correcting Code) RAM modules are a special type of module used in servers and workstations, typically in scenarios where there is zero tolerance for data errors. Two common examples include scientific computing and financial systems....

RAM: Mac Pro - Blinking White LED

This article applies to the following products: OWC8566D3MPE4GB, OWC8566D3MPE8GB, OWC8566D3MPE16G If your 2009 or 2010 Mac Pro is displaying a blinking white LED, you may have mismatched RAM modules installed. The 4GB, 8GB, and 16GB modules listed above...

Mac: Flashing Light on iMac5,2 (1.83 GHz)

If you have an iMac5,2 with 3GB of RAM installed and you notice the LED on the machine flashes when you attempt to start up, most likely the problem is the amount of RAM you have installed. This specific iMac was originally sold as an educational model wi...

Mac: Reconnecting the Airport Antenna (Mac Mini)

After installing an SSD or a memory upgrade into an Intel Mac Mini, it can be difficult to remember exactly how to reconnect the airport antenna. The best solution is to the detailed installation video for your specific Mac Mini model - they are listed be...

RAM: Compatibility - 32GB Modules for MacPro6,1

Due to processor design and memory architecture, 32GB RAM module utilization occurs at a bus speed of 1066MHz with Apple Mac Pro 2013 E5-16XXv2 4-Core, 6-Core, and 8-Core processor equipped models, while factory 12-Core or after-market E5-26XX equipped mo...

RAM: Troubleshooting Tips

PROBLEM The Mac will not start up / it exhibits a beeping sound after startup with new memory (or RAM) modules installed. SOLUTION If you're having trouble getting your Mac to run normally after installing new RAM, there are several things you can do ...