Corsair CMX16GX3M2A1333C9 XMS3 16GB (2x8GB) DDR3 1333 Mhz CL9 Performance Desktop Memory Kit

Good for an upgrade or computer build. But, have had to send a couple back with errors. Corsair are very good at replacing them and give a lifetime warranty so you can take your time over testing them.When you have installed them, it's best to run a Microsoft Memory Test (just type 'Memory' into the MS search box and click on the memory test app. When it come up click the top layer of hypertext. Your PC will restart and run the test).If you ever get bad RAM, you will find your PC gives you a lot of BSODs (blue screen of death crashes).The key to diagnosing bad RAM is that these crashes will be for many different reasons (i.e not just IQRL alert.. IRQL_NOT_LESS_OR_EQUAL bug check has a value of 0x0000000, but for all sorts of reasons). It is then best to download the USB version of MEMTEST86 (it's free). It comes with instructions and free software to make a bootable MEMTEST86 USB. Then test each stick of RAM in by itself in each RAM slot (to make sure its not a motherboard fault). MEMTEST86 will find any errors and you can raise a returns case at Corsair (takes about a week for them to send you new ones).But hopefully yours will be faultless!

[Please read the Update at the end]This 16GB XMS Memory kit (2x8GB memory modules) is very good but the spec is not totally accurate and there should be a disclaimer to this effect. You even see a bold statement "Outrageously fast 1600MHz performance using 16GB of memory" with 1.5V spec shown a few lines below on the same page (unless Amazon corrected this as I have sent them a note pertaining to what I describe here) but this must be qualified.Corsair's own website indicates that the 1600Mhz clock rate is achieved at 1.65V which is quite different from the 1.5V indicated here under Product Specifications. If you, like me, use this memory with Intel new technology processors (the latest i5 and i7 CPUs), then the DDR3 memory is controlled by the host processor using an on-chip Memory Controller Hub (MCH). According to Intel's spec, the on-chip MCH was designed to support DDR3-1333/1600MHz memory at 1.5V, and any memory voltage above 1.5V can shorten the life-span of the processor or even damage it. Hence, operating the memory module at 1.65V should be avoided.This will not be an issue if an external memory controller is used (which may mean using with older processors), but I haven't looked into such scenarios as they don't apply to me; my interest is with systems using i5-3570K and i7-3770K processors (and many others that share the same Chipset such as the Ivy Bridge chipsets, e.g., Z77).I think there should be a disclaimer for customers using this memory kit with Intel processors that use on-chip MCH for memory control (I think all Ivy Bridge and Sandy Bridge microarchitectures, perhaps earlier ones, use the MCH).Update - 2013-02-18This memory kit is exchanged for  Corsair 16GB 1600MHz CL10 DDR3 Vengeance Memory Kit  which works as expected at 1.5V. Thank you Amazon.Update - 2013-03-26Corsair's website now indicates 1.5V instead of the 1.65V. As detailed under Comments link below, thanks to V. E. Brindle for pointing out the website correction.

I had originally given these memory sticks a good review. I suppose they are like most electronics, if they work then they are good. But I've now had the RAM fail on me twice. It failed once and I thought oh well, these things happen i'll just get it RMA'd (sent back for repair/replacement) by Corsair.Then when the RAM was returned to me, the note now says that I only have 30 days warranty on these repaired/replacement chips. So some memory I bought that was less than a year old broke...they were replaced by Corsair for free...but now I only have 30 days warranty on them. Sure enough, it's 6 months later and the same chips that were replaced under warranty have now broken again and I cannot have them RMAd because it's beyond the 30 days.So their "lifetime warranty" is a pile of dog poop since if you ever need to use that lifetime warranty it then becomes 30 days warranty. Even if your product is still under 1 year old. Considering the fact that now 4 sticks of these have broken , I think i'll be avoiding Corsair products from now on and sticking with a well known brand and one that won't try to screw me out of my warranty.

Computer memory is a tricky matter. In the past I have tried using memory which appeared to fit the spec and was cheaper than the "official" memory from the pc supplier - only to find that it did not work. So it is essential to check that the memory has been tested with the intended motherboard/processor - if not I would always follow the pc producer's advice and recommendations rather than try and save a bit of money by buying an alternative source which appears to satisfy all the requirements density (eg 2gigabit/4gigabit) voltages etc etc only to find it will not work. Corsair is a highly respected producer of memory (possibly the best) but I still needed to check before purchase that it would work in my system because it would be an expensive mistake.

got some of this 6 years ago so got some more thinking if you need the same type then using exactly the same ram would be best so hit buy it again, but no it an older version than the one i got 6 years ago and has caused nothing but problems, blue screens, crashes, freezing, corruption of apps. very unhappyit is NOT the one pictured its older with yellow writing and wont work with the one picturedTotal wast of time effort. at least its a easy refund, the only good thing i can say i got my money back