RAM (random access memory), either RAM hardware or software and operating system use of RAM.

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48
votes
8answers
17k views

Why does Windows only show about 3.5 GB of my more than 4 GB of RAM?

I recently upgraded my computer's RAM to 4 GB. My 32-bit Windows installation shows only 3574 MB of the memory. How can I make Windows use the full amount of RAM?
28
votes
10answers
40k views

How can I tell what RAM will fit my computer?

If I want to add more RAM to my computer, how can I buy something compatible? What kinds are there? How do I determine which kind my computer will accept and how much I can add?
18
votes
9answers
54k views

Is there way to enable more than 4 GB RAM in 32-bit Windows OS?

I upgraded my PC to 4 GB RAM and I get only 3 GB. Windows 7 32-Bit consider that I've 4 GB RAM but didn't use more than 3 GB. Someone told me that MS Windows 32-bit doesn't support RAM larger than 3 ...
26
votes
9answers
121k views

How can I enable PAE on Windows 7 (32-bit) to support more than 3.5 GB of RAM?

I know that Windows XP 32-bit can be configured, through PAE, to support more than 3.5 GB of RAM. Is there a good tutorial to do this with Windows 7 32-bit? As to why I don't simply use 64-bit ...
11
votes
8answers
14k views

Why is usable RAM less than total RAM?

My girlfriend bought a laptop last week. It's a core 2 duo with 4 GB We installed vista 64bit, and one of the first things we did was right click on "My computer" to see gthe properties. Immediately ...
6
votes
2answers
9k views

4 GB of Ram installed but only 2.97GB usable. What gives? [duplicate]

Possible Duplicate: Where did the other .8 GB of RAM go? I just bought a used Macbook on eBay that came installed with 4 gb of ram. The first thing I did was installed Windows 7 using ...
4
votes
7answers
2k views

Where did the other .8 GB of RAM go? [duplicate]

Possible Duplicate: Windows XP and RAM 3.5GB+ Hi sys admins I have this system, which has 2 , 2GB SDRAM installed. when i check the system bios it shows as 4 GB But in windows XP , it shows ...
8
votes
6answers
11k views

How to enable 4GB in my Windows 7 64 bit?

I have the following machine configuration: Intel Core 2 Duo E6300 1 x 2048 MBytes memory chip 2 x 1024 MBytes memory chip 1 x Radeon HD 4870 Motherboard : Gigabyte 945P-S3 Windows 7 RTM 64-bit In ...
33
votes
4answers
55k views

Is it better to have four times 2 GB or two times 4 GB of RAM?

I'm building a Core i7-860 system which supports dual-channel memory (up to 16 GB in four DIMMs), my target is 8 GB. From the performance perspective, is it better to have two times ...
13
votes
8answers
86k views

Why is all my extra RAM marked as “hardware reserved” in Windows 7?

I have a new HP Z800 Workstation, running Windows 7 Enterprise 64 bit. Z800 Specs are here. The machine has 4GB of RAM -- windows reported 1.99GB available, 2GB was "hardware reserved". I added ...
29
votes
8answers
15k views

Is there any benefit from installing Windows 7 64-bit when you have less than 4GB or RAM?

I've recently purchased Windows 7 Ultimate. I have an AMD Athlon64 X2 5000+ with 2GB DDR2 RAM. I know RAM has gotten much cheaper, I know, I know, but I am not going to be able to upgrade my RAM for ...
29
votes
3answers
6k views

Windows using too much RAM, how to diagnose resource hog

I have 16GB of system RAM. On startup with no applications open except the task-manager Windows is using about 3gb of RAM. I looked in the processes tab, but nothing seems to be out of the ordinary. ...
44
votes
5answers
6k views

How to Determine which Firefox Add-ons are Using the Most Memory

I love Firefox for its add-ons. I have a lot of them installed, which obviously increases memory use. But it seems that some add-ons are better than others in that department. Does anyone know a way ...
12
votes
9answers
24k views

How to Check RAM Size without Looking at Motherboard

As far as I am aware, one can view the RAM Size in System Properties: From the above screenshot it seems that My RAM is 3.5 GB, but as far as I can tell I actually inserted 2 two GB RAM into my ...
17
votes
3answers
4k views

What limits a motherboard from supporting more memory?

My specific question is with the ASUS M3N78-VM motherboard that my home server uses. I currently have 4x2GB installed for a total of 8GB but I was hoping to upgrade to say 16GB (4x4GB). The official ...
5
votes
2answers
2k views

Windows 7 memory usage

Physical memory(MB) for Windows 7 Total 4021 Cached 1113 Available 768 Free 174 Memory used 3.25GB At this point, windows7 asks me to close some programs because "system memory is low". From my ...
12
votes
3answers
15k views

Can you tell DDR and DDR2 apart visually?

I'm getting a few old computers to take apart for parts soon. Most of them are definitely using DDR2 RAM, but there is the possibility that one or two of them are using DDR RAM. Since these are ...
4
votes
3answers
9k views

8.00GB RAM (3.22GB usable) in Windows 7 x64

I have set up Windows 7 Ultimate 64-bit on my PC. I have 8GB RAM and my BIOS states the correct amount (8192MB), but Windows (System Manager) says I have 8.00GB (3.22GB usable). give me a solution. ...
31
votes
12answers
17k views

Any reason not to disable the Windows pagefile given enough physical RAM? [closed]

The question of disabling the Windows pagefile has already been discussed quite a bit, for example here and here and here. People continue to upvote answers that say "you should not disable your ...
2
votes
2answers
3k views

64-bit Windows 7 can only use 3.25GB of RAM instead of 4GB? [duplicate]

Possible Duplicate: How to enable 4GB in my Windows 7 64 bit? My Windows 7 is 64-bit, and I thought that means it can use the full 4GB of RAM installed on the computer. But I just saw this ...
19
votes
3answers
57k views

How do I find what's eating up all of my system's memory? (not SuperFetch)

How does one diagnose/discover memory-related problems, if Task Manager appears to not be reporting correctly? I must have a memory leak or something -- I'm at 75% usage of my 12 GB of memory, but ...
8
votes
6answers
17k views

How does Motherboard and CPU affect RAM choice?

I am seeking advice on which memory to use with my motherboard and CPU. Below are my components and some relevant information extracted from their official websites. NOTE: Although this is a very ...
19
votes
4answers
2k views

Is there a certain or measurable advantage to using ECC RAM in a desktop PC?

I fuss a lot over building stable machines -- in that I absolutely hate crashes, reboots, funny behaviour, etc. -- and so error-correcting a.k.a. ECC RAM would seem to solve a big problem: memory ...
20
votes
7answers
3k views

Is it possible to use a storage disk (such as a USB drive) as RAM?

My motherboard (HP Pavilion s3000y) only supports 2GB of RAM max. Which means that I can only allocate 1GB for running VMs, and applications that use a lot of RAM are slow (such as games and Visual ...
77
votes
4answers
60k views

Can a 32-bit OS machine use up all 8GB RAM + 20GB page file?

What I understand about 32-bit OS is, the address is expressed in 32 bits, so at most the OS could use 232 = 4G memory space -- I assume the unit is bytes, so 4GB. Does this mean if any machine with ...
2
votes
2answers
7k views

Dual Channel RAM vs. Quad Channel RAM

I just bought a motherboard that says it supports Dual-Channel RAM. The RAM I'm looking at says it's a "Quad-Channel Kit" . Will it work with my motherboard? EDIT: Thanks all for the replies. Here is ...
29
votes
14answers
31k views

What happens when more RAM is installed than the motherboard supports?

I have a free RAM slot and some spare memory that will fit my computer. However the problem is my motherboard only supports 2GB and I have 2GB installed. What would happen if I plugged the spare ...
3
votes
4answers
5k views

I have 4GB of RAM installed but only 2GB are useble?

In the BIOS it says 4096MB, so the BIOS detects it. However Windows 7 only lets me use 2048MB. What's the problem?
2
votes
2answers
2k views

Can I mix different RAM modules in PC?

I have 4 RAM slots on the motherboard P5K. At the moment I have two 1GB RAM modules and two 2GB RAM modules. Everything is working fine. Can I buy one 4GB module and put it instead of the 1GB ...
2
votes
5answers
389 views

Memory sticks, 32 and 64 Bit OS

My current setup: Windows Vista, 32 bit 2 sticks of 1 GB Kingston HyperX 1333Mhz ram Asus P5K3 Deluxe Motherboard My Theoretical, temporary setup Windows Vista, 32 bit 4 sticks of 2 GB, 1333 ...
-3
votes
1answer
4k views

Installed RAM : 4 GB but 2.96GB Usable…why? [duplicate]

Possible Duplicate: 4 GB of Ram installed but only 2.97GB usable. What gives? Installed RAM : 4 GB but 2.96GB Usable......why? I installed 2 x 2 GB DDR2 800 MHz. My Windows is Windows 7 ...
41
votes
6answers
19k views

Windows pagefile size with large RAM and SSD

I just upgraded my Windows 7 machine from 12GB to 24GB RAM - both for running more VMs and for future proofing. My C drive is an SSD with 129GB formatted size. I was surprised to find out that the ...
18
votes
5answers
12k views

Does installing larger RAM means consuming more energy?

Since every bit of a dynamic memory module needs to be refreshed to keep it's data, does that mean that if I install a module with more capacity than the current one on my laptop, more energy will be ...
8
votes
7answers
26k views

Will adding more RAM speed up my computer?

Apparently, you can speed up your computer by adding more RAM. Is the amount of ram to be added is directly or indirectly related to the amount of hard-disk space, processor speed, Motherboard etc... ...
11
votes
7answers
24k views

Is it safe to use RAM sticks with different frequencies?

I have two RAM sticks: one 533 MHz and one 667 MHz. Is it safe to use both of these in the same system?
7
votes
6answers
5k views

Why does my sytem only uses 3.2GB of my 4GM RAM?

I am using win 7 64 bit. I tried the solution given here, didn't help. David's answer makes me think this is futile. Is there anything else to try? Updates: Notice that I have a graphic card on ...
8
votes
1answer
2k views

How does RAM frequency and latency differ? How does it affect performance?

I have a question regarding two specifications of RAM memory, the amount of Mhz and the latency timings (example: 9-9-9-24). Which one of the two is most important for system performance and why? ...
7
votes
2answers
7k views

Getting 'running low on memory errors' on Windows 7 64-bit with 8GB RAM

I have a new Dell laptop running Windows 7 64-bit with 8GB RAM. If I leave the system running overnight I start getting low memory errors the next day. Looking at Task Manager it shows 6.27GB used but ...
16
votes
5answers
5k views

Windows 7 unreasonable ram usage

I have a fresh install of windows 7, and my ram in normal startup goes up to 2.5 GB. I looked at task manager, and there's at least 1.5 GB missing from there and in resource monitor as well. No ...
6
votes
2answers
1k views

Triple vs. Dual Channel with 6 sticks of memory

Assuming a Core i7 with a x58 chipset (IOW, triple-channel is supported)... I'm trying to decide if I need to buy triple channel memory kits. The MB has 6 slots, and I will populate them all. So I've ...
4
votes
2answers
3k views

Windows 7 / Page File Disabled / 12 GB RAM / 2+ GB RAM free and “your computer is running low on memory”

So I am running on Windows 7 (64-bit) Home Premium with 12 GB RAM (Intel Core i7 920). I have restricted the Page File to 400MB since it was eating up a lot of space om my SSD (that is 80GB). After ...
17
votes
4answers
31k views

How to test video card memory

I want to test the memory of my video card because there are vertical lines on my screen. I have done some basic troubleshooting and it seems that the problem is in the video card. I want to validate ...
11
votes
1answer
4k views

Wired Memory vs. Active Memory in OS X

I'm having trouble understanding the difference between Wired Memory and Active Memory in OS X. Do not talk about the four types of memory (don't talk about free or inactive memory, because I ...
7
votes
4answers
8k views

Mac OS X: What is using my 'active' memory?

I'm using a recent MacBook Pro with 8 GB of RAM and after a few hours of using it at work I notice the amount of 'active' memory growing and growing. Whenever I reboot my Mac, everything looks fine ...
12
votes
5answers
15k views

Why are RAM size usually in powers of 2 (512 MB, 1, 2, 4, 8 GB)?

The newer computers usually have 2, 4, 8, etc GB of memory. The older ones usually have like 128, 256, 512 MB or less but usually also in powers of two. What is the reason behid this? Why don't hard ...
3
votes
5answers
5k views

Should I be worrying about Single Channel and Double Channel for my RAM?

I've got an Asus P5N-EM HDMI motherboard. When I run CPU-Z, it says my Memory is Single Channel. Currently, i have 2x2GIG Kingston DDR2 ram modules installed. These are the screenies from CPU-Z: ...
14
votes
2answers
2k views

What do the memory timings and RAM mean?

On every piece of RAM you'll see the timings like: "2-2-2-5". What is this all about? What should I buy?
12
votes
8answers
7k views

Windows only sees 768 MB RAM out of 4 GB

I have a windows XP machine with 4 GB of memory. As expected (and discussed in a dozen or so other questions on this site) the OS could only see 3 and a bit... until yesterday. As of yesterday, the ...
9
votes
7answers
5k views

Running Windows with defective RAM

Is it possible to run Windows (7, x64) with a defective RAM module? More precisely, is there some way to tell Windows not to allocate a known bad address or block of addresses? For Linux, there is ...
9
votes
4answers
8k views

Releasing swap space

At times the kernel seems to be intent on keeping e.g. firefox in swap, even though there is enough physical memory available and I'm using firefox: robert@rm:~> free -m total ...