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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How do I ensure smooth video and music playback without breaks?

I'm using a MacBook Pro from 2011 with 4 GB RAM and I'm experiencing problems with music playback in iTunes (music stops and starts periodically) and video playback does the same. I've read many ...
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1answer
326 views

Why does free + active + inactive + speculative + wired not equal total RAM?

When I run vm_stat on my 10.6.8 MacBook Pro with 2 GB of RAM I get the following: Mach Virtual Memory Statistics: (page size of 4096 bytes) Pages free: 90518. Pages active: ...
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1answer
72 views

Can I use memory taken from a Macbook Pro in a Mac Pro?

My Macbook Pro from around 2008 finally died. It has two 1 GB memory chips. (Specifically, two of this Samsung chip.) My question is: can I use these chips in my 2011 Mac Pro?
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1answer
1k views

Can one influence Mac OS X's / Darwin's filesystem caching behaviour?

I have the following problem: When I run processes that consume a lot of memory, Mac OS X seems to refuse to release a large portion of the filesystem cache: In fact, instead of letting go of the ~ ...
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1answer
73 views

What are the requisites for RAM in a MacBook?

I've just purchased my MacBook Pro (13-inch, Mid 2012) (it's not the retina model where RAM is fixed) and I'm considering more RAM. On the system information app, I found this info. BANK 0/DIMM0: 2GB ...
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2answers
181 views

Is there a technical reason not to upgrade a MacBook's RAM past its listed maximum?

According to this page, Macbooks are expandable to memories larger (and, in one case, faster) than those released by Apple. Search for "expandable" in that page to see the many cases. But Apple is ...
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2answers
899 views

Is it possible to reduce memory usage by iTunes 11 on Mac?

I have iTunes 11.0.1 running on Mac OS 10.8.2 with quite a large music library, some podcasts and my iPhone connected. According to Activity Monitor, the iTunes process is taking 1.6 GB real memory, ...
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3answers
916 views

Would Upgrading to 16GB RAM be Beneficial?

I'm running on an i3 processor, 2010 model, 3.06 GHz. I'm currently have 4GB of RAM, but if I were to upgrade to 16GB, would: Applications open quicker? FPS increase in game? Overall performance ...
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0answers
429 views

How to down-clock RAM?

My Mac (Mid 2009- MacBookPro5,5) laptop installing OS 10.8.2. Currently, it is using 2 x 1GB (1066 Mhz). My friend gave me 2 x 2GB (1600 Mhz) of his 2012 Mac. After installing 2 x 2GB (1600 Mhz) on ...
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2answers
1k views

8GB 1333mhz SODIMM in Macbook Pro 13" 2010 (7,1) alongside original 2GB stick

I understand that 8gb modules are not officially supported in this MBP. However, this indicates that they are, as long as they are 1067mhz modules: Can I use 16 GB RAM with my MacBook Pro 7,1? I ...
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1answer
2k views

find what's producing inactive memory

First of all i'd like to ask politely for all of those who feel the need to explain it to me how perfect apple's memory management is to ignore this thread. A little background: The theory goes that ...
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1answer
65 views

Can I run 533 MHz RAM in original Mac Pro?

I have an original Mac Pro with 2 GB of RAM in it. Running Mountain Lion on it is a bit painful - lots of paging. I happen to have 4 GB of PC2-4200 ECC FB-DIMMs kicking about. What I wanted to know is ...
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2answers
472 views

Macbook Air 2012 memory upgrade

I've won a 4gb RAM Macbook Air yesterday. I know that the RAM is soldered to the motherboard, so therefore non user upgradeable. I was wondering whether my nearest Apple Store could perform an ...
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3answers
1k views

New Corsair ram beeping on late 2008 MacBook

I purchased Corsair RAM memory (2x4GB) CMSA8GX3M2A1066C7 from Amazon.com. According to the description it "Works with any Mac computer that supports 4GB DDR3 SODIMMs". My MacBook supports 6GB ...
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1answer
737 views

RAM upgrade – iMac Mid 2011

I’ve got an iMac Mid 2011 with 4GB RAM preinstalled (2 x 2GB) and want to upgrade to 12GB. Is it ok to add a single 8GB RAM or is it better to add 2 x 4GB?
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1answer
240 views

How do I monitor the total physical and virtual memory usage of a process and all of its descendants?

From the command line, how would I get the total physical and virtual memory usage of a process and all of its descendants (not just 1st-level children)? This is useful when you want to monitor the ...
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4answers
257 views

Complete Specs for Mid-2010 iMac & Early-2011 MacBook Pro?

OK, so here I am. I've searched anywhere I could but definitely couldn't find what I was looking for. I'm thinking of performing some sort of upgrade (e.g. SSD or memory or CPU) and I'm trying to ...
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1answer
137 views

Productive use for old SO-DIMMs?

Being the local geek, friends and family turn to me for upgrading RAM in their computers. They provide the new sticks and I keep the old ones. As such, I have accumulated quite the collection of DDR3 ...
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1answer
123 views

Macbook Pro unresponsive while opening applications

I have had an 240gb Corsair SSD in my 2.53 GHz Intel Core i5 Macbook Pro (OSX 10.6.8) for about 8 months. The computer has 8gb RAM. It has been great for most of that time, but in the last month or ...
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1answer
420 views

What are the consequences of using DDR3 RAM in DDR2 MBP4.2?

I'm supposed to use DDR2 5300 (667MHz) RAM for my MacBookPro 4,2. The max is 6GB, and I already have 4GB (2 x 2GB), so I only need a single stick of 4GB. So far it looks like this spec RAM runs about ...
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1answer
248 views

MacBook Pro has to recover from Safe Sleep after 50% of all sleeps, although power is connected

When I wake my MacBook Pro from sleep it sometimes has to recover from Safe Sleep, even though the power is connected. I have installed 16 GB (2x8) RAM myself on my MacBook, however 8 GB is the max ...
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1answer
203 views

Mac has enough memory, but still pages in, is that a problem?

I recently upgraded my memory, but I notice that while the OS does NOT page out at all (from what I see in Activity Monitor), the machine pages in regardless. Why does that happen? Is that a problem? ...
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1answer
366 views

Memory for iMac12.1 (mid-2011)

I've found here that imac12.1 (mid-2011) unofficially will support 32 GB of RAM. Questions: Can I mix 2x2 GB with 2x8 GB of memory to get 20 GB of RAM? Will this model work with imac12.1? Thank ...
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1answer
556 views

Will this RAM work for me? (Late 2009 iMac)

I have a 27-inch iMac late 2009 desktop computer and i'm looking to upgrade my ram. The best RAM I can find is a Kingston 2GB, DDR3-1066, PC3-8500, CL7, DIMM. What I currently have is 4GB 1067 MHz ...
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2answers
3k views

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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1answer
4k views

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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2answers
1k views

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
1k views

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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2answers
3k views

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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1answer
207 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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2answers
8k 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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2answers
8k 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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3answers
3k views

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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0answers
953 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
1k views

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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0answers
108 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
141 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
7k views

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
3k views

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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3answers
286 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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0answers
302 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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0answers
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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1answer
11k 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
13k views

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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2answers
360 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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3answers
119 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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2answers
4k views

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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6answers
28k views

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
7k views

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 ...