Adata Ddr Ram 1gb Ddr2 400 Apple For Mac

$11.99 Buy It Now 12d 15h, FREE Shipping, 14-Day Returns, Seller: (72) 0%, Location: Brooklyn, New York, Ships to: US, Item: 18 A pair of 1GB Hynix SODIMM PC2-6400S-666 Memory sticks pulled from a Macbook. These work well and are very easy to install. Condition: Used, Condition: Condition: Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully. Read moreType: DDR2 SO-DIMMNumber of Modules: 2 Form Factor: SO-DIMMCapacity per Module: 1GB Bus Speed: PC2-6400 (DDR2-800)Brand: Hynix, Type: DDR2 SO-DIMM, Form Factor: SO-DIMM, Brand: Hynix, Bus Speed: PC2-6400 (DDR2-800), Number of Modules: 2, Capacity per Module: 1GB See More.

The RAM has to be tech-spec identical. It does not have to be bought from same vendor or same batch at same time. That said, the tech details are same size, same speed, same chip configuration (# chips on the DIMM) and timing latency. Good resellers will have that data for their memory.

Apple: 'Composition' of your RAM - Composition refers to size, speed and devices on the chips you're using. If you want a 128-bit data path, you need to match composition of the two DIMMs you use. For example, if you have a 256 MB DIMM with latency of PC3200 - 30330 and 8 devices, you'll want to install an additional 256 MB DIMM with the same characteristics. And you can pull most of that info up on your existing Mac from the Profiler: About This Mac - More Info - Memory. Now look at the size, speed type and speed.

This has to match the new additional RAM. And you can eyeball and count the chips on the DIMM you have to be extra sure.

From conversations I've had with tech staff, and from articles I have seen, it seems the speed benefit of matched paired RAM is fairly minimal - on the order of 5% usually. My real world experience: I had the opportunity to change my configuration of 1 GB RAM: 2 x 512 MB, which were a matched pair in tech specs but not vendor, to make room for a new 1 GB DDR DIMM. Now I have 1.5 GB RAM. (speed and latency match the Apple original 512MB, but size is different.) For me, the huge and very noticeable improvement, is that my Mac now does not generate the multiple swap files that it used to (sometimes up to 5) - and thus the responsiveness of the system seems to me to be VERY much better with 1.5 GB RAM, even though not a 'matched pair.' When 1 GB RAM comes down in price, or when someone wants to donate a 1 GB DDR DIMM RAM to me!, I will be happy to install it and get both the memory boost and the 'gravy' of 5% (or whatever value it technically is) 'matched pair' boost. From my user-experience perspective only, yes. The 1.5 GB total RAM at 64 bit data path creates a faster 'feel' to the OS when many programs are running, than my previous setup of 1.0 GB total RAM (2x512M pair) with its 128 bit data path.

Though, I did not run any memory intensive tests to compare speed in a before and after mode - I was more eager to get the 1.5GB total in than in testing to see if I could time and notice the difference in comparative performance tests. And, when only a few programs are running simultaneously, there is no discernable speed difference, to me of now versus before. That is, when few programs are running, I do not see a 'hit' of reduced performance (-5%?) due to the 64 bit memory chunk processing it is doing now.

So I would say, if you had to choose between a 1 GB matched pair setup vs a 1.5 GB unmatched setup, go for the bigger total RAM. It will generate more over all benefit than the pairing data path trade-off. All I have to go on is what Apple has published for its iMac G5 specs and support info. These state that - the May 2005 iMac Rev B uses PC3200 400 MHz DDR SDRAM memory chips, while newer Oct 2005 iMac Rev C requires 533MHz PC2-4200 DDR2 SDRAM chips. The spec pages make no mention of matched pairs. Though since the new iMac Rev C apparently has 512MB fixed, and only one available memory slot, the only matched pair configuration is 1GB total.

Adata Ddr Ram 1gb Ddr2 400 Apple For Mac Free

And since it markets it as 2.5 GB capacity, one would think they are either downplaying the matched-pair benefit in Rev C, or the Rev C may not even take advantage of the matched pair configuration. The Apple support article is where they make a statement about benefits of matched pairs and refer to a difference between 64 bit data path and 128 bit. And, as I wrote earlier, it seems the benefit of matched pairs in the Rev B, though technically measurable, may show only minor real-world-user benefit. The main user-noticeable improvement comes from increasing the total amount of RAM. However, if others have deeper technical knowledge or experience, by all means, let us know. Apple Footer.

Adata Ddr Ram 1gb Ddr2 400 Apple For Mac Pro

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