Memory normally refers to RAM. Temporary, high-speed storage used to keep frequently accessed information available for use and helps keep the computer running smoothly

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Can a RAM module not be compatible with Macs?

There are DDR3 RAM modules sold on Amazon (branded by KomputerBay) where it is specified that they are "PC only" and not for Mac. They cost around £41.99 ($68). The same company has modules with the ...
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Reliability of cheaper RAM like Komputerbay, or unbranded?

Online stores sell DDR3 memory from companies like Komputerbay for a fraction of the price that Kingston, Samsung, Crucial, OWC, etc. charge (not mentioning Apple OEM). Most reviews are good, but ...
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iMac 2012 RAM upgrade with mixed voltages

Variation of already asked question: I now understand that I can add two matched 8 GB sticks of RAM into the two empty slots, even though the other two slots are filled with two 4 GB modules. But is ...
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1answer
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Are all four SO-DIMM slots user-accessible in the 27 inch iMac (Late 2012)?

I'm going to buy a new 27" iMac, but I think that the RAM on the Apple Store is really too expensive. My plan is to buy with minimum (2x4GB) RAM and replace everything with 4x8GB. Are all 4 slots ...
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2012 iMac RAM Upgrade

I've just ordered the 27" iMac, which has user-upgradable RAM slots. There are four slots, and the default configuration that ships is two 4GB modules, and two empty spaces. Can I fill the other two ...
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203 views

Is the macbook retina's soldered RAM in any way faster than typical RAM?

You would think it would make some kind of difference...
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7k views

How important is the 16gb ram upgrade on 15" retina macbook pro? [closed]

So I am on the market for a new workhorse laptop that will be my main computer. My use for it will be mostly web design/python programming, and would like to check out the latest games. I was ...
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7k views

Using memory with a higher MHz rating? [duplicate]

Can MacBook Pro's successfully support and fully exploit RAM of a higher MHz rating than that which they ship with? For example, take my 15" MacBook Pro (Late 2011) that ships with 4GB of 1333MHz ...
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MacBook Air RAM Usage [duplicate]

Possible Duplicate: Trouble Understanding Inactive Memory in MacOSX I'm just wondering why does the Activity Monitor or Free Memory app says that I have 867 MB free (while writing this ...
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920 views

Close down all background iPhone apps without clearing task switcher (Jailbreak)

I have a 3GS running 5.1. Memory management is key to keeping it running smoothly. I've tried: SBSettings processes. Clears apps one by one and clears memory - and leaves them in the task switcher. ...
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1answer
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Do I need to do anything after upgrading my RAM?

I just replaced a 1GB RAM stick in my 2007-era Macbook Pro with a 2GB RAM stick. It already had Mountain Lion installed on it. Is there anything I need to do like configuring something in System ...
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105 views

memory bandwidth for 13.3 macbook pro early 2011?

I have a 13.3 MacbookPro early 2011. Stock memory is 2GB x 2 PC3-10600 DDR3 1333 MHz. Now I want to upgrade RAM as 4GB x 2. Can i buy a memory which is PC3-10666 1333MHz, or do i have to buy ...
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1answer
133 views

Using Ram pulled from new iMac in an old iMac?

My parents have an iMac circa 2007. Documentation says that this model should use this type of RAM: Memory: DDR2 PC2-5300 Memory Type: DDR2 PC2-5300, DDR2 (non-ECC) Maximum Memory: 4GB I've got a ...
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3answers
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How does memory management work in Mac OS X?

I am a university student who has been trying to write a compare and contrast paper between how Windows, Linux, and Mac OS X manage memory. For instance, with Windows, it's physical memory (RAM) and ...
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3answers
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Why is Java using so Much Real Memory?

Java is consistently listed as using 700MB of real memory. That is a nice chunk of change on my 4GB iMac. I don't even know that I am running a Java Application, ever. Any ideas?
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277 views

Available RAM less than what my Macbook is supposed to have

When I go into Photoshop and then I look at performance in the preferences, it says that I have "3240 MB Available", whereas I have a 4gb RAM MacBook Pro. Also, it often crashes, and I frequently have ...
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292 views

iPhone 4 with 6.4GB of free storage asks to change storage settings

My one week old iPhone 4 warns me to change my settings in storage when I go to add my music. I have no music, videos, pictures,... stored on my iPhone. The only thing I've got, are 4 simple apps. Is ...
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85 views

iOS Memory Mangement Technique

I was wondering what kind of technique does iOS use? Single contiguous allocation Partitioned allocation Paged memory mangement Segmented memory mangement I believe it is partitioned allocation, but ...
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9k views

How to identify CPU and memory usage per process on iPhone?

There are many common apps available to show total system RAM usage and free. However, my understanding is only a jailbroken phone has access to the APIs to access PER PROCESS memory usage on iOS. ...
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4answers
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MacBook Pro RAM upgrade is causing beeping sound?

I just upgraded the RAM in my MacBook Pro (15" 2 GHz Intel Core i7 - early 2011 model) from two 2gb modules to two 4gb modules. Started up just fine and ran great for about 10 minutes. Then the screen ...
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342 views

MacBook 5,1 (unibody) getting kernel panics if memory bank 0 is populated

Any configuration of ram that uses bank 0 on my MacBook causes a kernel panic after about an hour of use. The slot looks fine: all the pins are there, and are straight (no visible bends or breaks) ...
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113 views

How does the hardware manage to save the current workspace state so efficiently?

Basically, how does the system save every state in the workspace (windows, desktops, open programs etc) when you do a restart ? Does that affect the efficiency of the software in the long run ? For ...
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Is it possible to insert a 8 GB RAM stick and a 2 GB RAM stick into a Mac?

I'm buying a Mac mini with 16 GB of RAM on board. The other Mac I have is a 4 GB MacBook Pro. I'm wondering if it would be possible to shuffle the memories between both of them, so I have a single 8 ...
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1answer
1k views

Mountain Lion System Freeze - Poor Memory Handling?

Useful details: Core2Duo mid 2010 Macbook Air, 128Gb SSD, 2Gb RAM. Since I upgraded to Mountain Lion I've had this occur a few times. I'll be running my system and it'll completely freeze, no ...
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Isn't Inactive memory a waste of resources?

I'm looking for explanation of memory usage on my machine especially in light of the example in this screenshot below: I understand what is Free and Active means But what are the meanings of Wired ...
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3answers
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MacBook freezes with three beeps

My Feb-2011 MacBook Pro hangs with three beeps. I noted the first strange thing a few days ago. The MacBook was in standby (as always) but very hot (not usual). I thought some process must have ...
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55 views

Is there a way to monitor the stack of execution in order to find the longest hangs?

Related to this unsolved mystery: apple.stackexchange.com/questions/62416/why-do-i-get-serious-execution-lag-on-clicks-application-switching-and-general I'm wondering if there's a way to see which ...
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1answer
6k views

Why ever does Parallels 8 recommend max 4 GB RAM for a VM?

I'm a VMware Fusion user and am trying out Parallels since VMware has some quirks that are annoying on Mountain Lion on a retina MacBook Pro (16 GB RAM). I'm wondering about the baffling Parallels ...
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Recover in-memory Pages data from failed hibernation wakeup

My girlfriend's Macbook crashed while attempting to restore from a hibernated file. The progress bar stopped at ~10%, after which we restarted the computer for a normal startup. This hibernated ...
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1answer
2k views

Strange QuickLook Error

I recently installed an SSD (m4 crucial latest firmware) with TRIM enabled on my late 2011 MBP 13". I did a clean install of Mountain Lion 10.8.1, enabled FileVault 2 and everything was working fine ...
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111 views

iMac boots with one RAM, but not two

I've got a curious little problem going on over here. I've got an old late 2006 iMac (the white one). Was sportin' 1gb of ram, so I went and bought some more (4gb). Actually I bought two of those, and ...
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Why does OS X use virtual memory when I still have free RAM?

I have this awesome MacBook Pro with 8 GB of RAM. When I open up Activity Monitor it would seem that I have plenty of RAM available, but my computer seems to prefer to use virtual memory for many ...
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999 views

Macbook Pro doesn't wake up from sleep, RAM slot empty after force restart

My mid-2009 Macbook Pro, running Mountain Lion, very often does not wake up from sleep. When I open the lid, there is a black screen, but the fans are still running. My only option is to force reboot ...
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437 views

Configure MacBook Air at Apple Premium Resellers in Singapore

I am Abhimanyu, located in Singapore. I have a question for you all: Can I configure MacBook Air at one of the Apple Premium Resellers? I want to buy 13" MacBook Air, but I need 8 GB Memory, instead ...
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1answer
909 views

How to launch jar the same way Jar Launcher does

The source of this problem is that Jar Launcher (/System/Library/CoreServices/Jar\ Launcher.app) runs the jar just perfectly (as far as I know, the Jar Launcher app is the one that runs jars which you ...
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The free vs. inactive memory ratio on a Mac with 16 GB RAM has me concerned

I am looking for clarification since I am seeing large allocations of RAM on my Mac. I have 16 GB of RAM and recently installed Windows 7 on Parallels. When the machine runs, I see 3.55 GB Free memory ...
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2answers
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Disable inactive memory swapping

Background: OSX keeps some information in RAM that is no longer used, but was recently used. This is called inactive memory, and is intended to improve user experience by speeding up some actions: ...
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1answer
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Testing a MacBook Pro's RAM upgrade

What are the best possible RAM tests that can be run on a MacBook Pro (Early 2011 running Mountain Lion) after upgrading RAM from 4 GB to 16 GB? I see there a quite a few tools out there and the ...
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1answer
414 views

RAM upgrade options for a first generation 15" MacBook Pro

I am working on one of the first 15" Unibody MacBook Pro's (Late 2008 - MB470LL/A - MacBookPro5,1). According to EveryMac (and other sources), this machine really only supports 4GB of RAM. It looks ...
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What's the difference between real memory and CPU, and what are there effects on the performance of my computer?

In Activity Monitor, there are a couple fields: "PID", "Process Name", "User", "%CPU", "Threads", "Real Mem", and "Kind". I'm not familiar with the inner workings of computers and the related ...
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1answer
2k views

Can I upgrade my MacBook Pro using “generic” RAM?

Has anyone tried just buying generic RAM (which is 1/2 the price) such as the Kingston or Corsair brands? I figure if it works just as well as the $200 pairs, why not! I am open to other suggestions ...
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Why might more memory be wired in safe mode than in normal mode?

Maybe more noticeable in Lion and Mountain Lion, than in Snow Leopard and earlier versions of the operating system: in safe mode, an unexpectedly large amount of wired memory. Question Why ...
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1answer
496 views

Reduce memory usage in OS X Lion

I have a summer-2006 iMac with 2Gb memory. I use it mainly for "mainstream usage" : browse the web (including web-based applications such as Gmail) access a remote server (through screen sharing / ...
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3answers
3k views

Why does Finder use 59GB of swap space?

My new retina MacBook Pro(with 16GB RAM) keeps receiving this "Your Mac OS X startup disk has no more space available for application memory" message. I have 300 GB of free space on my hard drive, and ...
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836 views

Use different memory capacity RAMs in mac mini

I have a mac mini with 2GB RAM and want to buy another stick (since mac mini only have to memory slots) of 4GB (all other specs are the same), will it cause a problem? Thanks, Matt
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Putting in RAM with a higher speed

I wondering if I put my 1600Mhz 8Gig (4gigx2) modules in a Macbook Pro 17" 620m (2010 model) if the speeds would be automatically reduced to 1066Mhz? I'm just asking because I don't want to damage the ...
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261 views

Upgrading RAM on old MacBook

I need to upgrade the ram on an old macbook. It takes DDR2-667Mhz. Although those are quite expensive (guess they are not made anymore?). If I get higher MHz DDR2 memory will it still be compatible ...
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1answer
2k views

Why do Mac OS X ramdisks appear to be limited to 550mb and how can I change this?

All I can find on the Internet is a one line bash command to activate a ramdisk. It is only 550mb and I would like to be able to create on with more space? Is there a way to configure how big they can ...
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2answers
293 views

Is it necessary to disconnect the battery when installing new RAM in the early 2011 MacBook Pro?

I want to install additional RAM to my early 2011 MacBook Pro. I originally was only looking at the official Apple guide, but then while searching for a better screwdriver I found the iFixit guide, ...
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1answer
3k views

Does the “purge” command damage any thing in my system?

I am using OS X 10.5.8 and in spite of having 5GB of RAM memory, I face a lot of inactive RAM, and go to the terminal and purge it via the "purge" command (of course without quotes). I do this almost ...