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Memory Type: SDRAM, PC133, SDRAM (non-ECC)Maximum Memory: 1GB
Memory or DRAM is the "working" memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.
video - installing memory
(based on 1 review)
Reviewed by 1 customer
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from Fresno, CA
About Me Power user
Comments about Crucial 512MB Upgrade for a Apple PowerBook G4 800MHz System:
I'm mostly pleased with how easy to order and the Crucial Finder that matched my memory choice for me. So far, no crashes. Not sure about change in speed.
Bottom Line Yes, I would recommend this to a friend
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What is the difference between DDR3, DDR2, DDR, and SDRAM?
Single data rate (SDR) SDRAM is the older type of memory, commonly used in computers prior to 2002.Double data rate (DDR) SDRAM hit the mainstream computer market around 2002 and is a straightforward evolution from SDR SDRAM. The most significant difference between DDR and SDR is that DDR reads data on both the rising and falling edges of the clock signal, enabling a DDR memory module to transfer data twice as fast as an SDR memory module. The generation after DDR, called DDR2, began to appear in mid-2004. DDR2 is faster than DDR, delivering bandwidth of up to 8.5 GB per second. Frequently, DDR2 based systems can use memory installed in pairs to run in "dual channel mode" to increase memory throughput even further.The most recent generation of memory technology, DDR3, began to appear in systems in late 2007. DDR3 is the next evolutionary step beyond DDR2 and operates at lower voltages, which means it consumes less power, and it can transfer data at rates up to 12.8 GB per second. Your Mac supports only the memory generation that it first shipped with. You cannot mix and match SDRAM, DDR, DDR2, or DDR3 memory in a Mac. The different memory types don’t function together, they will not even fit in the same sockets.Because of this, you need to make sure that your upgrade is of the same memory generation as the memory that shipped with your Mac. The easiest way to find compatible memory is to look up your system in Crucial's Memory Advisor tool, that will list only compatible memory for your Mac.If you don't know the exact model of your Mac, the Crucial Mac Scanner will automatically detect your system configuration and give you a report on which upgrade is right for you.
Get a Mac-compatible DRAM upgrade for OS X Lion at Crucial.com
It’s the moment you’ve all been waiting for: Lion is here!
The successor to Apple’s Snow Leopard OS, the official memory requirement for Lion is a sparse 2GB, but the Memory Experts at Crucial recommend at least 8GB, once you factor in everything you’ll be doing with that OS, like watching videos, organizing photos and music, web browsing, gaming, and so much more. Crucial memory is guaranteed compatible with your Mac system when you use our online tool and and it costs far less than the memory you buy from your system manufacturer. Our Mac memory is backed by limited lifetime warranties and outstanding service and support.
To find out how much memory you have and what compatible upgrades are available, use our Mac System Scanner. If you know what memory you need, find it here.
Apple’s latest version of OS X was released on July 20, 2011 as a download from the Mac App Store, a departure from any previous OS releases on CD or DVD.So if you’re running Tiger or Leopard, you would first have to be upgraded to Snow Leopard, because the OS is only available via the Mac App store which is a feature of Snow Leopard.
.But don’t worry – you can get Lion on your system. If you don’t have Snow Leopard, you can get an in-store download at retail Apple Stores. Or you can buy the OS (on a USB drive) on the online Apple Store beginning in August 2011.
The new Mac OS X Lion is designed, according to Apple, to take the various interface capabilities that have made the iPad so popular and apply them to a more traditional Mac computer, including compatibility with the Mac App Store. Mac OS X Lion users can browse and make purchases using their Apple computer through an interface, called Launchpad, that opens as a full-screen display.
The ability to run applications in full-screen is another similarity between the iPad and OS X Lion. The system for running applications in full-screen is not only designed to create an immersive experience, it is also designed for convenience. By swiping the trackpad, users can freely switch between running applications without ever leaving full-screen mode. Mac OS X Lion includes a program called Mission Control, which shows running applications and processes and letting them control operations from a central hub.
All in all, there are a lot of great things about the new OS X Lion. With ample memory, you’ll get the most out of your investment today, and tomorrow.
How can I tell if my RAM is bad?
If you are having performance issues, software “hangs” or random crashes—we recommend you run a memory test. For the Mac OS, a popular tester is Rember, which can be found here:
Set Rember to test “All”, and check the box next to “Infinite” number of loops, and let the test run for at least half an hour. Since Rember is running from your desktop, it's important that you shut down all applications before you run the test. If you have any programs open, the test will be a lot less accurate.
If Rember finds errors with your RAM, you may need to replace it. To request an RMA, fill out the online request form, or contact Customer Service for your region.
How much memory do I need?
If your Mac is getting a little older, you may notice that it doesn’t run as fast as it used to. A memory upgrade from Crucial.com can give your Mac the boost it needs – for surprisingly little money.The amount of memory you need to optimize your computing performance depends on your computer model and what you use it. Overall, we recommend a minimum of 8GB of RAM for systems with the capacity. Learn more from these guidelines.
How do I know what to order?
If you aren't sure what Mac model you have or what kind of memory it takes, you can get your System Profile through the Apple menu. The profile will tell you what kind of memory and how much memory is in your system.
1. Open the Apple menu, and then select "About This Mac".
2. The "About This Mac" screen opens. Click the "More Info..." button.
3. The Hardware overview screen will open. Click on "Memory"
4. The Memory Slot screen will now apear and show your current memory configuration, what kind of memory is installed, and there will also be a link to memory upgrade instructions for your model.
If you want to make it really easy for yourself however, our Mac System Scanner will do all this work for you.Just download the tool and we’ll show you what memory you already have, and what memory upgrades are available.
You can also go through our Mac Memory Selector and manually pick out your system from menus, for a list of all compatible upgrades Crucial offers.
Both the Mac System Scanner and Mac Memory Selector can be found on our Mac Memory page.
I wonder if anyone can advise the best course of action - I'm not sure quite how to proceed.
I've just received a 16GB RAM upgrade kit [as recommended by the Crucial memory scanner] and installed this on my late 2011 Macbook Pro - 2.5GHz Intel Core i7 [the one with the high res screen].
Something has gone wrong; hes is what happened:
- Installed the new 16GB RAM > started up Mac > started up successfully > crashed after approx 1min
- I then checked the RAM was installed correctly by reseating it, all looked fine
- Started up the Mac again > got grey screen + 3x beeps + flashing sleep light
- I removed the new memory and replaced with the old [which was working with no problems] > started up > same 3x beep + flashing light
- again, checked the RAM was installed ok > started up again > seems to be working fine now - no crash for the last 30 mins
Has anyone had any similar experience, or can anyone recommend the next step to try? Should I just send the RAM back to Crucial as faulty?
Any advice would be very much appreciated.
My apologies if this question has been asked before. I am currently looking to upgrade my mac book pro ram (early 2011, i7 2.2GHZ) to 16GB memory.
I did a system scan and I was told that CT3373680 is the best match for my computer. However, I am currently based in Canada and If possible I would like to avoid ordering RAM from the USA due tax/delivery times etc.
My best option is to order via amazon.ca. I have checked the amazon website the following types of crucial ram is available there:
The specifications for these ram parts looks exactly similar to CT3373680. Could you please let me know, if I can use either of these parts in my system or I must use CT3373680?
Many thanks for your help.
I had a problem with CT8G3S160BM.C16FER 2x8GB for my iMac and just received a replacement of CT8G3S160BM.8DED. The new modules seem to be working fine but the primary difference is the modules I returned were low density (16 chips) and the new ones are high density (8 chips).
My question is: will this cause problems running in dual channel? On my system I have the new high density Crucial RAM in the DIMM0 banks and Apple's 2x8GB Elpida (low density) in the DIMM1 banks.
If I understand it correctly, dual channel only requires each pair to be matched but I would like to confirm that. Will there be any problems running two perfectly matched pairs of different densities? Thanks.
I'd also like to know if there is a performance difference between low and high density modules of otherwise the same specifications because I've read conflicting reports on it with some claiming low density to be better.
Sorry to clog this up again, but it seems the vendors are only selliing MAC RAM for the older machines it seems.
So I have a Lenovo ThinkPad Edge 0199-23U which can take up to 8GB as 2GB sodimm modules. It is PC3-8500 1066MHz DDR3 RAM with dual-channel capable non-parity.
So the question is will the CT4G3S160BM ram (2 modules) do the job even though it is quite a bit faster/newer?
Thanks for any feedback on this matter.