Your computer’s motherboard sports slots into which memory is plugged. What’s important is how those slots are filled with memory; you can’t just plug memory into the motherboard willy-nilly.
Mar 19, 2010 Or does it not matter at all? I have (2) 2gb rams. My Asus P5Q-Em has 4 slots. 2 yellow and 2 black. Currently installed on the yellow, but was thinking I should use the black slots 1st right? Nov 23, 2019 No. Computer has no response (black screen) and only 3 beeps from motherboard i hear. At now i see that this is problem with B1 (3) and B2 (4) channel on motherboard. Even one stick of ram placed in that slots are resulting in black screen and 3 beeps. Memories are working only in slots 1+2 and these are channel A1 and channel A2.
Understand memory slot configuration
There are several ways that a motherboard with four memory banks can host common amounts of memory: 1GB or 2GB. Because DIMMs come in different memory sizes, memory can be set up in a variety of ways inside any PC. (Note: Not all motherboards have 4 slots. Some have more, some less.)
You may have many reasons for choosing different arrangements of memory in a PC. For instance, a single 2GB DIMM an cost ten times as much as a 256MB DIMM. Conversely, a reason for using, say, two 1GB DIMMs rather than four 512MB DIMMs to get 2GB of memory is expandability. Upgrading memory is easier later, when memory slots are available.
Some PCs have a pairing requirement. The memory slots are organized in pairs, and every pair must have the same DIMM size. For example, you can have 3GB of memory in a PC with four memory banks. That’s two 1GB DIMMs in two slots and two 512MB DIMMs in the other two slots.
Yes, you may end up throwing away memory to upgrade. If your PC is configured with 1GB of memory using 4 256 MB DIMMs and you want 2GB of memory total, you have to throw away all the 256MB DIMMs and replace them with a combination of DIMMs.
Get the right DIMM
Not all DIMMs are alike. You must know the memory type, memory chip’s speed, and number of connectors, or pins.
There are several common types. Your computer uses only one memory type, and you must pick a DIMM that matches the type.
| Type | Description |
|---|---|
| DRAM | The official name of a RAM (Random Access Memory) chip: Dynamic Random Access Memory |
| DDR | A Double Data Rate RAM chip, also known as DDRRAM, which is an improvement on SDRAM |
| DDR2 | Another implementation of the DDR type of SDRAM chip |
| DDR3 | Yet another implementation of the DDR type of SDRAM chip |
| EDO | The Extended Data Out RAM chip |
| FPM | The Fast Page Mode type of DRAM chip |
| SDRAM | A type of DRAM chip, Synchronous Dynamic Random Access Memory |
| In addition to getting the right type, you also have to ensure that you buy the correct memory speed. And, finally, you have to get the right number of pins. Some DIMMs are 100-pin, some are 184-pin, and others are 200-pin. |
The easiest way to know what kind of memory you need is to use a computer program to determine how much memory is installed in your computer and how best to update. Computer programs can figure out this stuff without the need to open the computer case.
One program that works well for this purpose can be found at www.crucial.com, which also, coincidentally, sells computer memory. Visit the web-site. Use the Crucial system scanner tool; follow the directions on the web page. Eventually, it tells you exactly how to upgrade your PC’s memory.
White & Black MacBook Q&A - Updated July 15, 2016
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Ram Slots Used
How do you upgrade the RAM in the 'White & Black' MacBook models? What type of RAM do they use? How much RAM do they actually support?
This Q&A explains how to upgrade the RAM in the white and black polycarbonate MacBook models shipped from 2006 until 2009 (model number A1181). These models should not be confused with the *Unibody* white MacBook models shipped in 2009 and 2010 (model number A1342), which EveryMac.com covers separately.
EveryMac.com also provides RAM upgrade instructions for the Aluminum 'Unibody' MacBook models shipped in 2008 (model identifier MacBook5,1). The current 'Retina' MacBook models do not have RAM that can be upgraded at all.
Users interested in upgrading the RAM will be pleasantly surprised to discover that the white and black MacBook models are quite a bit easier to upgrade than some previous Apple notebooks.
Photo Credit: Apple, Inc. (White MacBook)
Identification Help
The White or Black MacBook models can be collectively identified by the A1181Model Number on the bottom of the notebook toward the hinge in tiny type.
There are seventeen different models that share this model number, though, so this identifier is not sufficient to pinpoint the specific type of RAM or its actual maximum capacity.
However, the EMC Number -- listed underneath the removable battery -- and the Model Identifier -- provided in software -- both are unique enough for the purposes of upgrading the RAM.
To locate the model identifier, select 'About This Mac' under the Apple Menu on your computer and click the 'More Info...' button. If the MacBook is running OS X 10.7 'Lion' or later, you will need to click the 'System Report' button after clicking 'More Info...' as well.
The Model Identifier and EMC Number for each of these models follow:
MacBook | Subfamily | Model ID | EMC No. |
MacBook | |||
MacBook | |||
MacBook | |||
Late 2006 | |||
Late 2006 | |||
Late 2006 | |||
Mid-2007 | |||
Mid-2007 | |||
Mid-2007 | |||
Late 2007 | |||
Late 2007 | |||
Late 2007 | |||
Early 2008 | |||
Early 2008 | |||
Early 2008 | |||
Early 2009 | |||
Mid-2009 |
EveryMac.com's Ultimate Mac Lookup feature -- as well as the EveryMac app -- also can uniquely identify these systems by their Serial Numbers, and this is another method that can be used to find the precise model.
More details about specific identifiers are provided in EveryMac.com's extensive Mac Identification section.
Official RAM Details
The Apple Support Site has a detailed PDF on 'How to Install Memory' in the MacBook that provides much of what you need to upgrade the stock RAM.
The Apple Support Document states that the MacBook:
Has two memory slots that you access by removing the memory door in the battery bay. Your MacBook comes with at least 512 MB of 667 MHz [or 800 MHz] Double Data Rate (DDR2) Synchronous Dynamic Random-Access Memory (SDRAM) installed.
Both memory slots can accept an SDRAM module that meets the following specifications:
- Double Data Rate Small Outline Dual Inline Memory Module (DDR SO-DIMM) format
- 1.25 inch or smaller
- 512 MB or 1 gigabyte (GB)
- 200-pin
- PC2-5300 DDR2 667 MHz Type RAM or PC2-6400 DDR2 800 MHz Type RAM
Official & Actual Maximum RAM
Apple officially supports a maximum of 2 GB of RAM in the original (Core Duo), 'Late 2006' and 'Mid-2007' MacBook models.
However, third-parties have discovered that the 'Late 2006' and 'Mid-2007' MacBook models -- both of which are equipped with a Core 2 Duo processor -- will work with 3 GB or 4 GB of RAM. Due to chipset limitations -- the same limitations that apply to the 'Late 2006' MacBook Pro systems -- these models can hold 4 GB of RAM but cannot fully utilize the memory beyond 3 GB due to the possibility of memory 'overlap'.
For these subsequent MacBook models -- Apple officially supports 4 GB of RAM, but, again, third-parties have found that these systems actually can support 6 GB of memory (using a mismatched 2 GB and 4 GB pair of memory modules).
For your convenience, the memory type and maximum memory capacity of each model are summarized below:
MacBook | DDR2 RAM Type | Max RAM |
667 MHz PC2-5300 | 2 GB | |
667 MHz PC2-5300 | 2 GB | |
667 MHz PC2-5300 | 2 GB | |
667 MHz PC2-5300 | 3 GB* | |
667 MHz PC2-5300 | 3 GB* | |
667 MHz PC2-5300 | 3 GB* | |
667 MHz PC2-5300 | 3 GB* | |
667 MHz PC2-5300 | 3 GB* | |
667 MHz PC2-5300 | 3 GB* | |
667 MHz PC2-5300 | 6 GB† | |
667 MHz PC2-5300 | 6 GB† | |
667 MHz PC2-5300 | 6 GB† | |
667 MHz PC2-5300 | 6 GB† | |
667 MHz PC2-5300 | 6 GB† | |
667 MHz PC2-5300 | 6 GB† | |
667 MHz PC2-5300 | 6 GB† | |
800 MHz PC2-6400 | 6 GB† |
Bad Ram Slot
* These models officially support 2 GB of RAM. However, third-parties have been able to successfully upgrade these systems to 3 GB or 4 GB of RAM (it can hold 4 GB but cannot fully utilize the memory beyond 3 GB).
† These models officially support 4 GB of RAM, but third-parties have been able to upgrade the system to 6 GB of RAM using one 2 GB and one 4 GB memory module. As re-discovered by a helpful reader, it is possible to physically install 8 GB of RAM in these models, and it will show up as installed, but as soon as RAM in excess of 6 GB is used, performance will 'nose dive.'
RAM Performance Tests
For all of these MacBook systems, Apple reports that 'for best performance, fill both memory slots, installing an equal memory module in each slot.' Given the slower 'integrated graphics,' the MacBook is heavily dependent on system RAM, and consequently, Apple reports that installing equal RAM in each slot is important for maximum graphics performance.
Site sponsor Other World Computing posted detailed test results comparing the performance of different MacBook models configured with different 'official' and 'unofficial' memory configurations up to 4 GB.
Unsurprisingly, matched RAM is ideal, but the extra performance boost provided by a mismatched larger configuration is better than a matched smaller configuration. In other words, 3 GB mismatched (2 GB + 1 GB) provides higher performance than 2 GB matched (1 GB + 1 GB).
RAM Upgrade Video Instructions
The Apple document provides installation instructions which should be read in their entirety before one installs memory.
However, this video from YouTuber 'readthename' is even better:
After watching the video, it should be clear that upgrading the RAM in these models is a straightforward endeavor. However, if you do not feel comfortable -- or have the time -- to perform the upgrade yourself, hiring a professional never is a bad idea.
MacBook RAM Purchase Options
Just because RAM meets the minimum listed criteria does not mean that it will necessarily function as intended in your Mac. Be sure to buy from a quality vendor that has tested their RAM with the specific type of MacBook to ensure full compatibility.
In the US (and many other countries), site sponsor Other World Computing sells memory and storage upgrades for the White and Black MacBook models (and all other Macs as well).
In the UK and Ireland, site sponsor Flexx sells MacBook compatible memory with free shipping. The company provides flat rate shipping to France, Germany, and Switzerland and inexpensive shipping for all of Europe, too.
In Canada, site sponsor CanadaRAM sells memory for all MacBook models with guaranteed compatibility, fast shipping, and no customs.
In Germany, site sponsor CompuRAM sells quality memory for all MacBook models with affordable delivery country-wide and in person pick up and professional installation service available in Munich.
In Australia, site sponsor RamCity sells MacBook compatible memory with a lifetime warranty and fast, flat-rate shipping Australia-wide.
In Southeast Asia, site sponsor SimplyMac.sg sells MacBook compatible memory with free delivery -- and optional upgrade service -- in Singapore and free shipping to Brunei, Hong Kong, Macau, Malaysia, Myanmar, New Zealand, the Philippines, South Korea, Taiwan, Thailand and Vietnam.
Also see:
- How do you upgrade the hard drive in the 'White & Black' MacBook models? Do these models support an SSD?
- How do you upgrade the RAM in the White 'Unibody' MacBook models (A1342)? What type of RAM do they use? How much RAM do they actually support?
- How do you upgrade the RAM in the Aluminum 'Unibody' MacBook models (MacBook5,1)? What type of RAM do they use? How much RAM do they actually support?
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