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<blockquote data-quote="aroy" data-source="post: 316074" data-attributes="member: 16090">Yes.. 32 bit OS will recognize only 4GB. 64 bit OS will recognize beyond thatWhat is more important is the Motherboard. There are two limitation. Physical limitation is the number of slots and the maximum DIMM size. If you have 2 slots and each can support only 4GB, then you max out at 8GB. If each can take 8GB DIMM then you have 16GB. On the other hand some older ones cannot go beyond 2GB DIMM, here you max out at 4GB.. Logical limitation is when the motherboard does not support beyond a certain size, even though it may be physically possible. My XEON MB has 16 slots, but supports only upto 4GB DIMM, so I am stuck at 64GB max. Some support bigger capacities, so could have 128GB with 8GB DIMMS or 256GB with 16GB DIMMS.Desktop MB are flexible, while most laptop MB are not. Some support 4GB, some 8GB and a few beyond 16GB.</blockquote>

[QUOTE="aroy, post: 316074, member: 16090"] Yes. . 32 bit OS will recognize only 4GB . 64 bit OS will recognize beyond that What is more important is the Motherboard. There are two limitation . Physical limitation is the number of slots and the maximum DIMM size. If you have 2 slots and each can support only 4GB, then you max out at 8GB. If each can take 8GB DIMM then you have 16GB. On the other hand some older ones cannot go beyond 2GB DIMM, here you max out at 4GB. . Logical limitation is when the motherboard does not support beyond a certain size, even though it may be physically possible. My XEON MB has 16 slots, but supports only upto 4GB DIMM, so I am stuck at 64GB max. Some support bigger capacities, so could have 128GB with 8GB DIMMS or 256GB with 16GB DIMMS. Desktop MB are flexible, while most laptop MB are not. Some support 4GB, some 8GB and a few beyond 16GB. [/QUOTE]

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