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.
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.
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
RAM: How Much Do I Need?
Unfortunately, there is no one correct answer to this question.
It depends on the specific Mac you're using, the operating system on
that Mac, and the specific software applications you use. While
Apple lists only 2GB as the requirement for some operati...
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...
Legacy 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
The Mac will not start up / it exhibits a beeping sound after startup
with new memory (or RAM) modules installed.
If you're having trouble getting your Mac to run normally after
installing new RAM, there are several things you can do ...
Mac: 2019 Mac Pro:Â Memory Configurations
Relevant Module Types / Base Modules:
* 'R DIMMS'
* 'LR DIMMS'
RAM (OWC2666DDR4Sxxx): Pairing Modules for 2020 iMacs
Recently we determined that OWC RAM modules that are compatible with
the August 2020 iMac (iMac20,1 and iMac 20,2), will report and operate
at a lower speed (2133 MHz instead of 2666 MHz) when paired with
modules from other manufacturers, including Apple ...