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Q:I have a Dell Dimension 8400. I want to take out the memory and add 3GB of higher speed memory. These Crucial 1GB modules seem to have the same specs as memory which Dell says is compatible with my 8400. Yet Crucial's Memory Advisor says this module is not compatible. Is this correct?
A:Only PC2-5300 modules will work in this system:
Q:What does the 6400 stand for
A:PC2-4200 (DDR2-533), PC2-5300 (DDR2-667), PC2-6400 (DDR2-800), and PC2-8500 (DDR2-1066) memory are all types of Double Data Rate, second-generation SDRAM, usually referred to as DDR2. The varying numbers refer to the different speeds of memory your computer was designed for. PC2-6400 (DDR2-800), which has a bandwidth of 6.4GB/sec and is designed for use in systems and motherboards that require a 400MHz front-side bus, with an effective front-side bus speed of 800MHz.
A:Its referring to the speed of the ram itself in technical terms mostly labeled on the packaging of the item. A dimm module for example a 2gb 800mhz 240 pin PC2-6400 is clocked at 800mhz so the 800mhz is multiplied by 8 bit (smallest digital character) which equals 6400(800x8=6400), same thing goes for a dimm(ram) which is clocked at 667mhz then this would be 667x8=5336 but on the box of the ram you'll see PC2-5300.
A:The 6400 is basically the speed that the RAM runs at. Not sure what the speed is measured by (GHz or MB ect) but naturally the higher the better, however, if you are installing more RAM into a computer then the RAM will only go as fast as the slowest RAM already installed.
1. Ran the scan on desktop pc at crucial.com
Maximum memory: 8192MB
Slots: 2 (2 banks of 1)
*Not to exceed manufacturer supported memory.
Although the memory can be installed one module at a time, the best performance comes from using matched pairs of modules.
2. Existing memory is 2 GB - occupies one of the two memory slots
3. Purchased 2 x 2GB Crucial 4GB Kit from Amazon -
4. Both memory slots filled - memory is read on boot up but......
5. Unfortunately the new memory does not work????? Put existing 2GB memory module back in slot.
Thanks for your help,
Thanks for your question. I have looked in to that system for you and it can support 2GB of memory in total and it has two memory slots. Each memory slot can support 1GB each. This means the 2x2GB memory modules would not work in your system.
We would need to see the part numbers of the memory modules you have received before we can confirm if they are compatible for you. When you receive the new memory modules it would be great if you could post on here with the part numbers that are listed on the memory modules. This way we can check if they are the correct speed and type for your computer. The part numbers will be printed on a sticker on the side of your memory module.
If you do ever need any help, please feel free to ask in here or to contact our customer service team directly.
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In most cases the RAM is the same, but there are cases where it is not. It can really depend on the system. It's always best to purchase RAM that is guaranteed to be compatible with your system.
Please let us know if there is anything else we can help you with.
I purchased CT51264BF160BJ new from Amazon few months ago which seemed to have normal package/sticker and runs okay.
However, MemTest86 identifies it as Super Talent CT51264BF160BJ.M8F in the PC (JEDEC SPD 1.0).
Does this make sense - was there some temporary issue in manufacturing week 7 of 2014 where Crucial programmed Super Talent's info (module rev x4444, mfg loc 5)?
My more recent purchase of CT51264BF160BJ from NewEgg shows SPD 1.1 with reasonable Crucial info.
Both SODIMMs have the same number of micron chips but the recent chips are slightly smaller.