Category Archives: Memory

Questions and answers about computer RAM memory

RyZen and DDR4 Memory – what to look for

AMD’s RyZen and RyZen third generation (Zen2) CPUs have rewritten the conventional wisdom around computer processors, the one that goes “Intel is the performance and innovation leader, and AMD follows behind with lower performance chips for the budget market”. The … Continue reading

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iMac 2019 Memory configuration

The 27 inch iMac for 2019 (5K, 2019) introduced DDR4 memory at the 2666 MHz speed, and an upper limit of 128 GB RAM. DDR4-2666 (PC4-21300) non ECC SODIMMs. Apple originally stated a 64 GB limit, however 32 GB modules … Continue reading

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DDR4 memory makes its debut

DDR4 memory starts shipping for desktop machines and servers. Through the years, the DDR Memory standard has been updated to DDR2, DDR3 and now DDR4 (JEDEC Satandard JESD79-4). It’s worthwhile to note that despite sharing the DDR name, each of these … Continue reading

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Q. How do I add memory to an Apple Mac Pro tower?

There are three main generations of Mac Pro machines, each generation has particular RAM types and installation procedures The models from 2006 to early 2008 use FB-DIMMs with large heatsinks in 667 MHz and 800 MHz. These models have two … Continue reading

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Glossary of memory terms and definitions

Types of RAM: Memory Terminology: This is a simplified overview of RAM terms and definitions 100 pin memory Used primarily in laser printers, 100 pin SIMM memory is not compatible with other formats. CAS Latency: To oversimplify a complex discussion, … Continue reading

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Q. What is Dual Channel memory?

Dual Channel memory access is a technique where the computer’s memory controller can access two identical memory modules as if they were one large module.  This gives a theoretical doubling of bandwidth between the memory controller and the memory.  In … Continue reading

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Q. What Memory and Drives fit my MacBook Air?

Apple MacBook Air machines feature Intel processors and an exceedingly thin Aluminum body. None of the MacBook Airs have internal optical drives, Apple sells an external USB Superdrive (make sure to check compatibility with your MacBook Air when buying a … Continue reading

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Q. How do I install RAM in a PC Notebook?

The RAM memory in most notebook computers is user-upgradeable. Almost all notebook machines use SODIMMs (Small Outline Dual Inline Memory Modules). Part of the trick is to discover where the memory modules are located in a notebook machine. The best … Continue reading

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Q. What memory fits my Apple Xserve server?

Model/ Identifier CPU/ Speed/ Screen/ Date/ Designation RAM Type & Speed Maximum RAM Hard Drive/ SSD XServe G4RackMac1,1 G4 1.0 GHz (4 RAM sockets Mid 2002, M8627LL/A ) DDR-266 DIMM 2 GB (4x512MB) 3.5″ PATA hard drive XServe G4/DPRackMac1,1 G4 1.0 … Continue reading

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Q. How do I install RAM in a Mac?

Memory in most Macintoshes is user-upgradeable. The bottom of this post has links to the Apple instructions for specific models.  Here are general instructions for installation on modern Macs. In machines with SODIMMs (notebooks, MacMinis and iMacs), there are two … Continue reading

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Q. What memory and hard drives fit my iBook G3/G4?

There are several models of iBook, the G3 models use PC66 or PC100 memory and the G4 models use DDR memory. Below is a list of all models. iBooks take 2.5″ IDE hard drives up to 120 GB in capacity. … Continue reading

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Q. What RAM memory and hard drive fits my Apple eMac G4?

Apple Macintosh eMac G4 machines took two different types of RAM – PC133 SDRAM and DDR-333 (PC2700 or PC3200 can be used.) In both models, the RAM is accessed through a trap door on the bottom of the machine. If … Continue reading

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Q. What RAM memory and Hard drives fit my Apple PowerMac G5?

There have been two major models of PowerMac G5, the change over from PCI-X to PCI-e slots, and from Dual processors to Dual-Core single processor was made in October 2005. With this change, PCI and PCI-X interface cards from the … Continue reading

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Q. What RAM memory and hard drives fit my Mac PowerBook G4?

The Powerbook G4 was a revolutionary notebook when it was released, having an all-metal casing manufactured with a Titanium alloy. In Early 2003 Apple switched to an aluminum allow for the case, and introduced 12″ and 17″ models. At the … Continue reading

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Q. What memory and hard drives fit Macintosh computers?

Different models of Apple Macintosh machines take different types and capacities of RAM memory and hard drives.  We’ve put together charts of all of the models of Macs since 1998 that list the RAM requirements and the hard drive types … Continue reading

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