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Why can I only use 3.47GB of my 8GB of RAM on my Windows 7 64-bit machine?

I had 4GB of RAM and just installed another 4GB. When I go to my computer's properties I see it recognizes all 8GB but I'm still only able to use 3.47GB.

My motherboard is an Asus P7H55-M which is supposed to handle up to 16GB. I'm running Windows 7 Enterprise 64-bit as well, so what might be causing this? How can I use all 8GB?

For what sort of workload can a Core i7-920 be faster than a i7-860?

Core i7-860 has a slightly higher clock speed (2.8 vs 2.66 GHz)

Core i7-920 has QPI and tri-channel DDR3 (vs DMI and dual-channel)

Computer Memory Configuration

So I currently have 4x 4GB Dimms of 1600Mhz memory (DDR3) in my computer, however one dimm has went bad.

Now, my understanding is that they are dual-channel, which means they are ment to run in pairs.

Is it better to drop to 2x 4GB Dimms for a total of 8GB of memory (preserving dual-channel)

or; go 3x 4GB Dimms for 12GB of memory, however i loose the dual-channel advantage, right?

Thanks SuperUser.

Can I use 3x2GB plus 3x4GB ddr3 RAM triple channel?

Made the mistake of thinking 12GB was enough, but I keep crashing out of memory while running sparse matrix solver... a few more GB should do it.

Is it valid to replace 3 of the 2GB modules with three 4GB ram modules, for 18GB total ? I realize that its "probably" valid, and "might" break triple-channelness, but does anyone have a specific experience trying this?

Mods- I think this is the same question, but unanswered and questionable choice of title... could be merged with my question. http://superuser.com/questions/139090/semi-hybrid-triple-channel-ddr3

What's the max memory i7 processors can use?

There are lots of i7 motherboards that support 64GB memory, and even one that supports 128GB: http://www.newegg.com/Product/Product.aspx?Item=N82E16813130681

But I read that i7 CPUs can't access more than 32GB of memory on some forums. Is this true?

If so, then what's the point of those motherboards?

Do DDR3 SODIMM modules come in sizes greater than 8GB?

I'm really interested on buying a 1x16GB DDR3 SODIMM module because my laptop has only one memory slot. I know that DIMM modules with 16GB do exist. But I can find only packs with two 8GB modules of SODIMM. So, where can I find such a module if it exists ?

The laptop I want to upgrade is an Asus UX32VD with 2GB of DDR3 memory on mother board (can't change it), and 1 slot. I upgraded it to 10GB (2+8).

How to check if two memory modules are being used with dual channel?

I have two 1333 DDR3 memory modules with different brands. I wonder if they can be used in a dual channel setup. How can I check that?

3GB of RAM showing up as 2GB

Last year I built a Core i7 920 system based on the ASUS P6T Deluxe motherboard. I have 3x1GB of DDR3 (triple-channel configuration), but only 2GB is being reported by: Windows XP, CPU-Z, the BIOS. Is this a hardware problem, or is the third gigabyte of RAM being reserved by the system for video card-related stuff? The video card has 512MB of RAM.

I realize that 32-bit Windows XP is not the ideal operating system for more than 2GB of RAM, but from what I've read it should be reporting at least 2.5GB.

Is a DDR3 MB compatible with DDR2 RAM?

If a motherboard's specifications say it supports DDR3 SDRAM sticks, would I be correct to assume it is also compatible with DDR2 RAM? Am I wrong, or does it depend on the motherboard?

SK hynix memory module PC3-10600S-9-11-F3: What does "11-F3" mean?

I know what are:

• PC3 (same as DDR3),
• 10600 (bandwidth in MB/s),
• S (stands for SODIMM, it's RAM for laptops),
• 9 (CAS latency).

Hynix HMT351S6CFR8C-H9 4Gb (front view):

But I couldn't find anything about what 11 number and F3 mean. Could anybody help in understanding what it is?

Can I use two types of DDR3 in the same motherboard?

I have a DDR3 RAM of 1333MHz of 4GB on my motherboard (Asus H61M). I have another stick of RAM DDR3 1600 MHz of 4GB. Can I use this in the other slot along with the original to reach a combined 8GB?

The manual of my motherboard says the following:

The motherboard supports DDR3 memory that features data transfer rates of DDR3 2200(O.C.)/2133(O.C.)/2000(O.C.)/1866(O.C.)/1600/1333/1066 MHz to meet the higher bandwidth requirements of the latest 3D graphics, multimedia, and Internet applications. The dual-channel DDR3 architecture enlarges the bandwidth of your system memory to boost system performance.

CPU-Z says my PC3-10600 1333MHz RAM is actually PC3-10700 667MHz. Do I have 1333 or 667 MHz RAM?

CPU-Z says this:

DDR3
4096 MBytes
PC3-10700 (667 MHz)

I am supposed to have PC3-10600 1333MHz.

What am I not understanding?

Or, is my RAM only half of what the label and seller claims it to be?

Recommendation for memory pairing in a 13" MacBook Pro?

I know usually it's better to run the memory on dual channel, if possible, with a Kit of 2x2GB, but at the moment my laptop has 2x1gb and I wanted to upgrade it.

Which means, I can either buy a kit of 2x2gb and try to sell the 2x1gb I already have, since the laptop only has 2 slots, or I can buy 1x4gb (also a bit more expensive) and add keep one of the 1gb dimms, making it 5gb non dual channel.

From what I hear, dual channel only gives you performance increase of 3-5%, so I'm unsure of which option to pick.

Does DDR3 ram need to be installed in pairs? [duplicate]

Possible Duplicate:
Matched DRAM — Why? Is it important?

I'm building a machine with the following motherboard and processor.

MSI 890FXA-GD65 Socket AM3/ AMD 890FX/ DDR3/ SATA3&USB3.0/ A&GbE/ ATX Motherboard AMD Athlon II X2 Dual-Core Processor 240 (2.8 GHz) AM3 1GB DDR3-1333 PC3-10600

Do I need multiple DIMMs for this setup to function?

If a motherboard doesn't explicitly support a RAM frequency, is still compatible?

For example, my Asrock P67 Extreme4 says this:

• Supports DDR3 2133(OC)/1866(OC)/1600/1333/1066 non-ECC, un-buffered memory

Is RAM clocked at 2400 MHz compatible? Will the performance be downgraded or it just won't work?

I found other questions but they were related to the CPU cap at 1600 MHz. This cap is related to the motherboard, specs says 2133(OC) max.