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Memory limitation question

Last response: in Memory
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April 16, 2014 6:11:14 AM

Lets say a motherboard have 4 RAM slots. I put a 8GB RAM into one of the slots but it can't detect all of it.

Them main point of this is what determines how much RAM can occupy a single RAM slot.

Is it a motherboard issue or a OS issue or both?

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a b } Memory
a b V Motherboard
April 16, 2014 6:17:01 AM

Both. Certain mobo chipset combos can only register a certain amount of RAM total and each slot. If the mobo can detect the RAM it is still possible that the OS can't address as much RAM as you have like putting 8 Gb in a 32 bit OS
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April 16, 2014 6:17:55 AM

All of the above. The motherboard and the OS both a maximum amount memory. The motherboard's limit is typically based on the max card size of the memory that fits in the mobo. For example, if you have a DDR3 motherboard with 4 RAM slots, it will likely hold 32 GB. 8x4 = 32GB. Operating systems are a little bit different. A 32-bit operating system will basically never make use of more than 4 GB of RAM. So even if you put an 8GB card in, it will only show 4GB. I don't know what the true limits of 64-bit are, but we're not even close to them yet. The max in Windows 8.1 64-bit is 128 GB, whereas Professional and Enterprise 8.1 64-bit have a maximum of 512 GB.
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April 16, 2014 6:55:08 AM

Is there anyway to find out what the exact amount a OS and motherboard would detect on a single RAM slot?
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April 16, 2014 7:00:54 AM

Is there a specific issue that you're trying to figure out? Including your system specs could probably help us explain whatever problem you're having.
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a c 2149 } Memory
a c 1696 V Motherboard
April 16, 2014 3:28:25 PM

OS has it's limits, based on whether 32 or 64 bit as well as version, i.e. 32bit - up to 4GB, 64 bit goes higher, but then you have say Win7 Home Premium 64bit is limited to 16GB total where Win7 64bit Ultimate can go 192GB...then the CPU if we look at Haswell, most can run 32GB max, but there are mobos that the Haswell can run on that don't support that much, this is generally a limitation of the mobos chipset, i.e. 1150 has the Z87, H81, B85, H87, et al those can be limited by number of slots available i.e. entry level and micro mobos say 16GB
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