100% Guaranteed Compatible
320/384MB
128MB
64/128MB
PC-100
1
1
Your IBM ThinkPad uses PC-100 type memory.
Your IBM ThinkPad can support up to 320/384MB of memory. For optimal performance install the maximum amount of memory in each socket.
Your system comes standard with 128MB of RAM. If you have upgraded your system then you may have a different amount.
A bank is a group of memory sockets. A socket is where a memory module is inserted. A bank can have one or more sockets.
One or more of the sockets in your system is already filled with memory. When you upgrade your system, you can either add memory to one of the open sockets and/or remove memory from a filled socket and replace it with a higher capacity memory module.
Your IBM ThinkPad X21 has 1 bank of 1 socket each for a total of 1 memory sockets.
*We recommend you upgrade your computer to the latest BIOS revision prior to upgrading your memory.
This model has a built in Compact Flash slot.
ETC tests each RAM module to ensure compatiblity with your IBM system. The memory modules listed above are guaranteed to work in your IBM ThinkPad X21.
Russ
Date: 7/23/2011
Fort Lauderdale Fl
Business User
I ordered 10 of these because 512MB fits my camera, and they, and 1GB are getting impossile to find.
If Edge had 1GB, which is the maximum my Nikon 5400 will accept, I would have ordered 5 of those, also, if as reasonably priced as these 512MB.
My order of ten (10) 512MB was received in good shape in a couple days.
Excellent Service, for an Excellent product.
TRENT
Date: 8/27/2010
GEORGIA
Business User
THE HARD DRIVE I PURCHASED WAS EASY TO INSTALL AND WORKED GREAT. MY OLD COMPUTER WORKS LIKE NEW !
Memory or RAM is a piece of hardware in your computer that holds software applications that you are working on. It serves as temporary working space between your computer’s hard drive and CPU.
Adding memory will improve your computer’s performance. Specifically, it will speed up opening new applications, running multiple applications at once, and switching between software applications (multi-tasking).
One task that additional memory speeds up is opening a new software application. Let’s take this as an example. When you open a new application on your computer, your computer’s CPU fetches the application from the hard drive and stores it in RAM memory. It stores it in RAM because RAM is very fast relative to the hard drive. When RAM gets full, and you open a new application then the CPU needs to kick out one of your open applications, put it back on the slow hard drive, fetch the new application from the hard drive, and place the new application in RAM. Basically, it swaps the applications.
This game of swapping wastes time. Ideally, your computer could have an infinite amount of RAM. Then your CPU would fetch an application once from the hard drive, save it into RAM, and never need to kick out another application. There is no such thing as infinite RAM, but you can max out the RAM on your computer by adding the maximum amount of memory to each socket.
To max out your RAM memory, add the maximum amount of memory to each memory socket. To find out how much RAM each socket can support, divide the system maximum RAM amount by the total number of sockets in your system.
For example, if your system maximum RAM is 2GB, and your system has 2 total sockets then the maximum amount each socket can support is 1GB. If one of the sockets is already filled then you can always remove the existing module and replace it with a higher capacity module.
No. The 1975 Magnusson-Moss Act prevents OEM manufacturers from disqualifying a warranty when 3rd party memory is used. For more details, please see the Magnuson-Moss Act.
Memory speed refers to the amount of time that memory (RAM) takes to put data into its memory or send it out. Your device’s memory will have an upper limit on the speed at which it can operate.
A memory kit is a number of memory modules sold as a unit or a kit. For example, a 1GB memory kit will contain two 512MB modules. This is written as (2x512MB).
Desktop Memory Installation (General)
Laptop Memory Installation (General)
Choose the appropriate installation guide or see our How To Install Computer Memory Guide.
184-Pin DIMM Memory Upgrade Installation Guide 168-Pin DIMM Memory Upgrade Installation Guide General SIMM Memory Upgrade Installation Guide 184-Pin DIMM Memory Upgrade Installation Guide 168-Pin DIMM Memory Upgrade Installation Guide General SIMM Memory Upgrade Installation GuideElectro-Static Discharge (ESD) is one of the major issues of damaging memory modules. Learn how you can avoid this by reading our Memory Handling Guide.
ETC Memory Upgrades for the IBM ThinkPad X21 are engineered to exact OEM specifications. ETC guarantees 100% performance and compatibility with your IBM ThinkPad X21.
EDGE maintains the highest security and customer service standards.
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Edge Tech Corp, an ISO 9001:2008-certified company founded in 1986, is a leading supplier of computer memory upgrades, portable computing products, storage devices, and other experience-enhancing technology solutions.
At the age of 14, ETC’s president and CEO, Jeff Thompson, began the company with $2,500 he had saved from a newspaper route in Ada, Oklahoma. With a fascination for the technology market, he began buying and selling computer parts in the Dallas Morning News. Today, ETC is one of the largest and most respected companies in its industry... (read more)
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