Crucial 4GB Single DDR3/DDR3L 1600 MT/S (PC3-12800) Unbuffered SODIMM 204-Pin Memory - CT51264BF160B

This memory works great in my Alienware M17x-R2 laptop (Intel Core i7 Q740 1.73GHz, *8MB DDR3-1600, NVidia GeForce GTX 285M-1GB, 2 x Samsung 640GB SATA 7200RPM HDD-RAID1 configured, and WD Elements 1TB eSATA HDD).I usually try to give informative unbiased reviews unless the product is trivial, like cables and novelty items. Sometimes my reviews can be a little wordy, but I do it mainly to help novice to intermediate users. This particular review, became more of an Alienware review than it is about the memory. I any case, if you are an Alienware owner, you should know this memory will work for you.The improvements I've noticed by upgrading from 4GB (DDR3-1333) are small at this point, but significant since I'm no longer having crashes from insufficient RAM particularly when I switch between log-ins. I'm running a lot of peripherals and multiple Operating Systems; Windows 7 Pro SP1 64bit, Red Hat Fedora 20, and with MS Virtual PC 2007, I'm using XP Media Center Edition 2005 SP3 32bit, Vista for Business SP3 32bit, and 7 Home Premium SP1 64bit. I know this system is compatible, but I haven't installed Windows Pro 8.1 64bit yet and I'm still not sure if I want to. I use this system for both gaming and as reference with desktop support calls, which is why I use two versions of Windows 7 and probably should add 8.1.The boot time has improved moderately for each of my operating systems, in some cases only by a few seconds which I attribute to my multi-boot configuration. Load times for some software under Windows has also improved, as with Adobe Photoshop CS5, and The Sims 3. Virus and malware scanning time has been cut down by nearly half the time. Since this system memory bus can only support 10666MHz, I am not seeing any changes in benchmarks due to the 12800MHz capable RAM upgrade, nor did I expect to. The memory is perfectly stable at the slower rate. Windows Index Rating also remains the same, and because Linux has low overhead system requirements - it's still just plain fast.I would have bought the 16GB kit, but I was getting conflicting, false, or misleading information about the maximum limits from my owner's manual and Dell technical support. The manual says 8GB and I have 3 different answers from Dell's staff who stated a) ...your system was delivered with the components it was designed to support... it took several tries for me to understand the accent before I realized he was implying it cannot be upgraded at all, b) The system will support up to 16GB, providing you have updated the BIOS to version A12, however, that was erroneous because the last firmware release is A10, and c) Windows only supports up to 4GB of RAM... which is argumentatively true under a 32bit environment and XP, but I'm mainly running W7 64bit so the response was irrelevant. Other sources claim it WILL support 8GB and may or may not support up to 16GB. I was not willing to risk the expense and hassle of finding out first hand and went with 8GB based on my manual and the fact that it was the largest kit offered on the Dell website for the M17x-R2.I've used Crucial Memory in several computers over the past years and have always had excellent results. The reliability has been unsurpassed by other makers. Its stability has given me and my clients months of run-time without failure in servers, desktops, laptops, and even printing devices.I hope this helps.

I purchased the 8GB Kit (4GBx2) to upgrade the RAM on my late 2011 MacBook Pro 13". First off, this kit works perfectly in that model of MacBook Pro, so you should have no concerns about compatibility. The MacBook Pro says it accepts RAM up to 1333 MT/s, but it actually accepts up to 1600 MT/s and it will work at full speed. I'm not sure why Apple does this, but trust me, it works.If you're looking to add some speed to an aging Macbook, there are two easy ways to give your computer a big speed boost: upgrade the hard drive or upgrade the RAM. For more casual users who want their computer to boot-up faster, load programs faster, and just perform more smoothly, I'd actually recommend a hard drive upgrade *before* a RAM upgrade. Swapping your old hard drive for an SSD like the Samsung 850 EVO 250GB 2.5-Inch SATA III Internal SSD (MZ-75E250B/AM) will seriously make your computer faster than the day you bought it.If you're still wanting more speed for complex tasks like video or photo editing, data crunching, or gaming then I'd recommend looking into a RAM upgrade. This kit comes in at a great price and should be very reliable. RAM prices can be very volatile, so check around for the going price, but Amazon is usually a good bet.Installation is extremely simple and step-by-step guides are available all over the internet (I'd recommend iFixIt). You may want to buy a small screwdriver with this to remove the bottom panel of your laptop--the screws are tiny and you can't do it with a normal screwdriver!

This review is going to be specific to my computing situation, and contain information that I wished were already in the reviews prior to my purchase (mostly because I was very nervous as to whether this was the right ram for me, and I assume there might be others out there who are nervous about purchasing this ram for their identical systems).I have two identical laptops, which are Samsung R780 models. I have the US versions, and they’re commonly referenced on websites as the R780 Red models. They run the Intel Core i5-430M processors on motherboards which run the Intel HM55 chipset. The stock memory were 2x2GB (for a total of 4GB) Samsung PC3-8500 (1066MHz) DDR3 modules which are dual voltage modules capable of running at either 1.35v or 1.5v—however on my laptops the stock memory ran at the higher voltage of 1.5v. The stock ram modules had a latency rating of 7-7-7-20.Prior to purchasing this kit I had some concerns about whether it would work in my system. The item description here on Amazon mentions it is dual voltage (just like my stock ram was) however the official Crucial website states only the 1.35 voltage. Further, the sticker on the ram, as well as the sticker on the retail packaging, only mention the 1.35 voltage (mentioned in other reviews, but I can confirm that is how it is on the product). I contacted Crucial’s customer service and they did verify that the ram is dual voltage capable, so I went ahead and purchased it, and what follows are my results.This ram was plug-and-play without requiring any adjustments to my bios settings. It “under clocked” automatically down to the PC3-8500 (1066MHz) that my system is capable of utilizing. In doing so, it runs at a latency of 8-8-8-19 and at a voltage of 1.35v. This was rather surprising to me as my stock ram ran at the higher 1.5v and though this ram is capable of achieving the higher voltage, my laptops are happy to run it at the lower voltage. Another surprising result was that although the CL rating is slightly higher than the stock ram, this ram actually outperforms the stock ram within Windows 7. The WEI rated the stock ram at a 5.9, whereas this replacement ram rates as a 6.6 on one laptop and a 6.7 on the other laptop. I've now doubled my previous amount of ram, and have maxed out the laptop's capabilities (as it can only accommodate 8GB of ram).If you’re like me, and have a Samsung R780 that you feel is plenty powerful to do the things you want to do, but that needs a little more ram for multitasking (or just having 20 tabs open in your web browser) then I can recommend this ram and can confirm that it will run on this system. It will run at a lower voltage and still outperform the stock ram. I’ve only had the ram for about a week, but the difference is noticeable for me (especially when having a lot of internet tabs open) as the computer can store more in the ram and not have to access the much slower on-hard-drive page file to store and retrieve data. Hopefully the longevity of the product is as good as I’ve experienced with previous Crucial purchases, but I will update this review in the future if I encounter any issues.

Product performed superbly! Easy installation. Great Value for money. High recommendations!