sudhan_venkat :
While reading some post through the community I realized that I should not have asked that question if I had to choose between a 1333 or 1600, It goes without saying that if both the RAM's are available at the same price I should obviously go with 1600 which the faster RAM when compared to 1333. Have always heard that its better to have (2 X4GB) than a (1X8 GB).
These are the two 4 GB RAM I have decided on (JM1600KLH-4G vs TS512MLK64V6H) which are more less available for the same price with the same configuration (4 GB (1 x 4 GB) \ DDR3 PC RAM\ DDR3-1600 \ 512Mx8).
I assume that the change in codes is to do with the batch manufacture codes ? Am I right in assuming that ?
Rgds,
Sudhan
Hi there,
512Mx8 refers to the internal organization of the DDR3 SDRAM chips. These numbers are indeed quite confusing.
Each DIMM (memory module) contains one or more ranks. A rank is a collection of chips that when tied together form a 64-bit data bus. Each memory channel can have one or more ranks attached to it, but only one rank can be active at a time.
The most common arrangement of chips is 8 chips per rank, with each chip having 8 data pins. These are tied together to form a 64-bit interface, which is standard for x86 platforms.
Internally, each chip has 8 independent memory banks. That's what the 512Mx8 describes. Eight memory banks, each of which holds 512 megabits. By multiplying this out, that DDR3 SDRAM chip is 4 gigabits in size. By then multiplying the capacity of each chip by the number of chips in the rank, we get the capacity of the rank. Eight chips per rank multiplied by four gigabits per rank yields 32 gigabits per rank. At a rate of eight bits per byte, that yields four gigabytes per rank.
If one rank is installed on a DIMM (commonly eight chips on one side of the board), this forms a 4GiB DIMM. If two ranks are installed on a DIMM (commonly eight chips on both sides of the board), this forms an 8GiB DIMM.
What if the memory banks are smaller? 256Mx8 describes an SDRAM chip with 8 memory banks each of which hold 256 megabits. Eight of these results in two gigabits, exactly half of a 512Mx8 chip. By applying the same mathematics in the example above, this results in a 2GiB rank. Thus, a single-rank DIMM has a capacity of 2GiB, and a dual-rank DIMM has a capacity of 4GiB.
All else being equal, more ranks provide better performance. A dual-rank 4GiB DIMM should always be used over a single-rank 4GiB DIMM, but the single-rank DIMM will usually be cheaper.
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