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Is it possible to install one or more 4GB DDR3 1066MHz SDRAM in an Asus G51J?

My Asus G51J has 8GB (4x2GB) and I'd like to upgrade to 4x4GB (16GB).

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2 Answers 2

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There's a fairly lengthy post here regarding that laptop model, 16GB of RAM and performance in general.

On the whole, it seems to work as far as hardware support goes, but there are significant doubts about how noticeable it is from a users perspective.

Some of the key paragraphs of note are:

This is a further explanation of where I think this notebook benefits best from its 1333Mhz memory allocation, as we know it is capable of using up to 16GB SDRAM, in a matched or random batch of high-quality 1333Mhz SODIMMs (be they 4GB SODIMMs in 2x 8GB matched "kits" or simply 4GB SODIMMs bought individually and assembled into a 16GB allocation of RAM); we also know it can support 12GB RAM in the configuration that I extensively tested for our mutual benefits previously, which is 2 x 2GB 1333Mhz SODIMMs paired with 2 x 4GB 1333Mhz SODIMMs, either an 8GB "Kit" or a pair of 4GB individual SODIMMs, totaling 12GB RAM, and I found that this particular combo of 12GB yielded the highest througput in Everest Utltimate Benchmark Testing, across the board, plus it tested to be much more stable than 16GB did overall, as the memory controller gets "overloaded" or shall we say "saturated" at the 16GB quotient, and the notebook suffered freezes, and significant performance bottlenecks with 16GB vs 12GB RAM, or so I found testing the Corsair brand of RAM in this notebook.

[-snip-]

So that's the story tonight, and I am here to report it faithfully to all you who are thinking of using more than 8GB of RAM in the computer, and basically guys and gals, if any, it seems to be a waste of good old All-American $$$'s to stock up one of the G51's with 12GB or 16GB of RAM...it might turn a few heads, and it might be of some benefit when one is using multiple high-yield RAM programs at the same time while working hard on a project or assignment of whatever sort you can think of...but overall using 6GB or 8GB of RAM in this notebook seems to be the logical way to go with it! That idea is congealed from much thinking about this subject, a ton of testing results and efforts both in my notebook and SassiMac's to boot, albeit his being virtually new and mine being an earlier example of the breed, they are both G51JX-series notebooks through and through, and representative of the genre such as it is, and I feel 100% justified in writing the conclusions I came to in the past couple of days, and strange though they are, they are what they are, end of story!

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For consideration, i have the same laptop model and i had the same doubt. Well, since Intel Ark page says that Intel Core i7 720QM memory controller doesn't support more than 8GB of RAM., i decided to buy 4x8GB sticks of Corsair Ram. I installed them on my laptop and it worked, so i can confirm that i7 processors of first gen of Core i-series can handle up to 32GB of ram.

Here are two links to screenshots of CPU-Z: Memory and Processor

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Yes, you're right. But the article referenced by @LuckySpoon, says that there's no improovement in performance using more than 8GB. Did you felt some improvement using 32GB? –  italo Feb 7 '13 at 19:31
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I work as a software developer, so sometimes I need to lift several virtual machines, so I need lots of ram. No performance improvement by increasing the amount of RAM over 8GB in daily computer use, but with a greater amount of ram you can create ramdisks and enhance the performance of certain programs. Also you can have much more programs running (without the need to close them). Is more a functional benefit than a performance one. Nevertheless the question was referred to the compatibility of memory, rather than the performance difference. Greetings. –  pwnercl Feb 7 '13 at 19:39

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