What is Ram: Definition and 82 Discussions

Random-access memory (RAM; ) is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code. A random-access memory device allows data items to be read or written in almost the same amount of time irrespective of the physical location of data inside the memory, in contrast with other direct-access data storage media (such as hard disks, CD-RWs, DVD-RWs and the older magnetic tapes and drum memory), where the time required to read and write data items varies significantly depending on their physical locations on the recording medium, due to mechanical limitations such as media rotation speeds and arm movement.
RAM contains multiplexing and demultiplexing circuitry, to connect the data lines to the addressed storage for reading or writing the entry. Usually more than one bit of storage is accessed by the same address, and RAM devices often have multiple data lines and are said to be "8-bit" or "16-bit", etc. devices.In today's technology, random-access memory takes the form of integrated circuit (IC) chips with MOS (metal-oxide-semiconductor) memory cells. RAM is normally associated with volatile types of memory (such as dynamic random-access memory (DRAM) modules), where stored information is lost if power is removed, although non-volatile RAM has also been developed. Other types of non-volatile memories exist that allow random access for read operations, but either do not allow write operations or have other kinds of limitations on them. These include most types of ROM and a type of flash memory called NOR-Flash.
The two main types of volatile random-access semiconductor memory are static random-access memory (SRAM) and dynamic random-access memory (DRAM). Commercial uses of semiconductor RAM date back to 1965, when IBM introduced the SP95 SRAM chip for their System/360 Model 95 computer, and Toshiba used DRAM memory cells for its Toscal BC-1411 electronic calculator, both based on bipolar transistors. Commercial MOS memory, based on MOS transistors, was developed in the late 1960s, and has since been the basis for all commercial semiconductor memory. The first commercial DRAM IC chip, the Intel 1103, was introduced in October 1970. Synchronous dynamic random-access memory (SDRAM) later debuted with the Samsung KM48SL2000 chip in 1992.

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  1. KyleGranger

    RAM for AMD Ryzen 9 5950x: 2 vs 4 for FEA

    I am looking to build a computer using the AMD Ryzen 9 5950x. I am wondering I will be better off with 2 or 4 sticks of RAM. I will be using this for FEA.
  2. Delta2

    Why do we need to increase voltage when overclocking PC components?

    When we overclock CPU or GPU or RAM we also have to increase the voltage to achieve stable operation (provided we have adequate cooling). Why is that?
  3. MathematicalPhysicist

    What type of DDR3 RAM should I buy for my computer upgrade?

    I want to upgrade my computer by adding more memory to it. My PC runs on UBUNTU 16.04 with: processor: AMD A8-7650K Radeon R7, 10 Compute Cores 4C+6G × 4 graphics: AMD KAVERI (DRM 2.43.0 / 4.4.0-190-generic, LLVM 6.0.0) I thought of purchasing: 1600MHz 2x8GB DDR3 PC3-12800 Desktop PC DIMM...
  4. M

    Engineering Thevenin Theorem seems to not work in this 1 bit RAM RC circuit

    I have a problem which consist in 1 bit RAM made of 3 MOSFETs. One of the questions is to calculate the maximum voltage that the memory element can receive. I have obtained the result by inspection (it is 4 Volts) but I'm unable to reach the same by applying the Thevenin Theorem. My...
  5. MathematicalPhysicist

    How Close Are We to Having a Single 1TB RAM Memory Card?

    How far are we from a one card of memory of 1TB? I mean not using several memories, but just one memory card with a capacity of 1TB? My question is regarding the memories in desktops or laptops.
  6. Wrichik Basu

    Two x-GB RAM cards ##\neq## one 2x-GB card?

    Say you have a computer (desktop or laptop), and you have, say, 8GB total of RAM. There are two options to get a total of 8GB: 1. Use two 4GB cards. 2. Use one 8GB card. The mechanic who services our desktop says that using two RAM cards is not equivalent to using one single card. He says...
  7. PainterGuy

    Understanding DRAM Refresh Operations

    Hi, Could you please help me with the questions below? All of the questions are related to each other. Thank you. Question 1: Please have a look on this attachment. The following text is from the parts highlighted in yellow in attachment. "Dynamic memory cells store a data bit in a small...
  8. Don Bori

    Hydraulic Oscillating Ram Pump

    How can I get the Input Torque required to pump the double-acting cylinders with the following specifications below? Ram Working Pressure = 2 bars Ram ID = 100 mm. Ram Stroke = 1,000 mm.
  9. T

    Nitrogen pneumatic gas ram -- force to compress the piston in a cylinder

    Hi, Can some one point me to where I can workout the amount of force required to compress a niitrogen filled ram. Ram has an 80 mm bore and 172 mm stroke. We have filled it with nitrogen to both 1 and 1.5 bar. thanks Brett
  10. M

    Uniaxial press: 1 ram vs 2 rams

    Assume to have 2 hydraulic presses for compacting powders with the following designs: Press A has 2 rams that apply force in opposite directions, pointing towards the powders in the middle Press B has 1 ram that applies force in one direction, towards the base of the press My colleagues keep...
  11. G

    RAM memory diagram using decoders

    Homework Statement Draw a block diagram of 32kx8 bit RAM memory using decoders DEC 3/8 and memory components 8kx8 bit. 2. The attempt at a solution First we find the number of memory components: N=\frac{32kx8}{8kx8}=\frac{2^{18}}{2^{16}}=4. The number of decoders is 32/8+1=5 There are 4...
  12. wolram

    B How does Ram pressure kill galaxies

    Reading this article it states that ram pressure can kill off star formation, can you tell me please what ram pressure is? https://www.sciencedaily.com/releases/2017/01/170116160620.htm
  13. LtIvan

    My Static RAM Cell I Made over the Weekend

    Allo, Recently, I have been researching RAM, including formats such as DRAM and SRAM. While I was running simulations on SRAM one week, I realized I could make a 1 bit Static Memory Cell using a simple Schmidt NAND IC. I ran a draft for it displaying two feed backing NAND gates as inverters...
  14. LtIvan

    Dynamic RAM: Capacitance and Refreshing

    Wes thu hal, I have been researching computer hardware aspects, and I have been recently looking at RAM types, particularly DRAM. I am think of making a simple model of it for a hobby. For a DRAM bit cell, does the capacitance value matter? What affects does it have if it is big or small, e.g...
  15. LtIvan

    Everything About RAM: All You Need to Know

    Allo, Introduction: I want to know the insides and outs of ram, mainly the hardware side of things. I know the concepts of RAM and other computer parts like CPU's, Graphics Cards, etc, and how they relate to each other in computer architecture. I know basically that RAM is temporal memory...
  16. C

    Homework help.... Strokes of pump to raise a ram

    Hi all, I have this question in my HND... A hydraulic jack has a load piston diameter of 150mm and a plunger diameter of 25mm. a) Ignoring losses, calculate the force required on the plunger to raise a load of 2500Kg. I have calculated my answer (correct or not i don't know) to be...
  17. HyperTechno

    Troubleshooting RAM Issues for Scientists

    When I turned on my computer, it was successfully booted up to the Windows Logo and then suddenly restarted... there, in the menu with the details related to RAM, HDD etc that shows up at first when the computer is booting, My RAM was shown as 1024MB . (I have 2048MB of RAM... and after the...
  18. C

    MATLAB Is 2GB ram enough to work on C language and matlab

    Hello everyone I am going to buy a computer soon. And because I don't have much money, computer s ram can be 4 GB at most and which will cause me some trouble. My question is that will 2gb ram be enough to work on MATLAB and learning to code.
  19. J

    How are processes' memory stored in RAM?

    How is memory of programs stored in RAM? The memory for a single program is represented: Where memory reserved for stack, data , bss and code segment are fixed, but heap can grow indefinitely. Is the free memory between stack and heap all of a computer available RAM? So where is the memory...
  20. S

    What are pyramidal RAM geometry? (on Anechoic chamber)

    i found that in Anechoic chamber there are pyramidal structures over the walls, what are the geometries of the height and base of those pyramids? W and H on the picture:
  21. bob_wbstr

    Question on the ram air effect

    I am now 76 years old but as a young man I served an apprenticeship with a well known motor manufacturer and we apprentices were able to carry out experiments on engines in testbeds that were connected to dynamometers. In one such experiment we attached a straight length of pipe to the air...
  22. M

    Help with decoders and RAM [Digital Logic]

    First I really don't know where I should post this (I'm assuming this place is fine, maybe coursework?) So I built a circuit that includes a 1k x 4 RAM ( so I'm assuming that stands for 4000 Kb but I wouldn't see why you'd need to write 1k x 4 RAM) Furthermore, I'm having trouble...
  23. G

    Where in the world can i purchase a A ram air turbine Rat_

    where in the world can i purchase a A ram air turbine Rat.._ i want to mount it on the roof of my rv trailer build. and use it as a wind turbine generator as i drive down the road, to recharge my batteries.. i heard you really can't use a regular wind turbine or can you..?? or will it just...
  24. N

    How does RAM give "4"th value when CPU requests the "001"th

    Hey all, I'm currently building a 8 bit CPU and ram in simulator software but have no idea how to call a specific memory cell, ie I can't call the "001"(binary) cell, I'd want it to be translated to call the 4th cell. How does real ram solve that issue? Any help appreciated, thanks.
  25. Medicol

    New RAM bar into my free slot for gaming

    I am excited to tell you that I will get new RAM bar for my PC. Oh I like this site, http://www.crucial.com/ it can read all hardware thingies on my computer, I now know I have Maximum memory: 16384MB Slots:2 (2 banks of 1) *Not to exceed manufacturer supported memory. 4GB Empty that means I...
  26. M

    MHB Relationship between the Turing Machine and RAM Models

    Hey! :o Could you tell me which is the relationship between the Turing Machine and RAM Models??
  27. M

    MHB Equivalent RAM Program: Hints to Show Complexity $O(T^2(n))$

    Hey! :o I have to show that for each RAM program of time complexity $T(n)$ under the logarithmic cost function there is an equivalent RAM program of time complexity $O(T^2(n))$ which has no MULT or DIV instructions. Could you give me some hints how to show that?? (Wondering)
  28. M

    MHB Converting Recursion into Loops for Computing n^n

    Hey! :o Write a RAM program of uniform-cost time complexity $O(\log n)$ to compute $n^n$.Prove that your program is correct. (Under the uniform cost criterion each RAM instruction requires one unit of time.) So that the time complexity is $O(\log n)$ the size of the problem should get divided...
  29. M

    MHB Exploring RAM and Indirect Addressing: Accepting Languages

    Hey! :o Show that any language accepted by a RAM can be accepted by a RAM without indirect addressing. Could you give me some hints what I could do?? (Wondering)
  30. vead

    How we access RAM or ROM memory

    how we access memory and which instruction we use that determine weather we are accessing Internal rom , Internal Ram ? how to access rom example Mov R0, #55H ; load R0 with 55H Mov R1, #85H ; load R1 with 85H how to access ram memory Mov 00, #55H ; ram location 00 has 55H...
  31. B

    Understanding the Memory Hierarchy and Its Impact on CPU Performance

    I just was thinking somebody may be able to help me understand something about Computers. If I have a PC and the Memory in it is 1066 MHz I know the real Clock speed 533 MHz because DDR Dabbles the Data Rate. And if I have a CPU that is 2 GHz it is running at 2,000 MHz now this is what I...
  32. S

    Proteus: Creating a 16*8bit RAM with D flip flops

    Homework Statement Hey! I need to create a RAM in Proteus Suite. The RAM should have 16 storage spaces each containing 8bits of data (16*8bit RAM) and the output should be a three-state output. I've tried to create one, but I can't seem to get the hang of this three-state thing, and I think...
  33. Y

    How to Interface 8086 to a Single 8-Bit Wide RAM

    How to interface 8086 to a single 8 bit wide RAM (only one RAM is given)? How to connect 8086's A0, BHE, A1-A19 pins to the mentioned RAM?
  34. A

    How is Ferroelectric RAM Operated?

    Hi, the schematic unit cell in DRAM is drawn below: https://docs.google.com/file/d/0BzvjZoZeQg3nd1JYNTdGOTdIS2c/edit?usp=sharing Here, "zero" or "one" are simply capacitor charged or not. So to write a bit, we attach (or not) a source (Vcc) voltage with switch WBIT. In the case of FeRAM, we...
  35. M

    Can I load my entire OS into the RAM? If so, how?

    The DDR3 1333 is relatively cheap, so I'm thinking about buying a server mobo that can stock up to 64 GB of RAM (2^64 enables that many address lines, I suppose?) Then I can pre-load the entire windows into the RAM, so : Advantages: super-groovy and sweet just to think about lightning fast...
  36. P

    How to develop a RAM Pump with a 300m delivery head?

    Hey there, I was just wondering if its actually possible to configure a RAM Pump to deliver up to a height of 300m (984 ft) I've made a ram that has a delivery head of 35m (115ft) for personal use; however a family friend wants me to set up a RAM for them that goes up to 250m and...
  37. K

    Performance gains above 1600MHz RAM

    I was told that performance gains using memory above 1600MHz in enthusiast desktops is very small and unnoticeable, and is only useful when overclocking. This has something to do with "JDEC" what is JDEC?
  38. K

    Is there any other place I could get this RAM?

    Newegg is currently out of stock and they don't have it anywhere on tigerdirect. It could be months before they have them back in stock. I'm building a new PC and I have the MSI big bang mpower Z77 motherboard. I read that this memory kit was designed specifically for my mobo. Is there any...
  39. D

    How much force is 5T of pressure exerted by a hydraulic ram?

    Homework Statement How much force is 5T of pressure exerted by a hydraulic ram? Homework Equations P= F/A Hydraulic Ram F1/A1=F2/A2 The Attempt at a Solution 5KN ?
  40. R

    Hydraulic ram force calculation help?

    Hi, I was wondering how to calculate the force of a hydraulic ram in Newtons if the piston diametre is 20mm and the oil pressure is 52 bars. I would like it if someone could explain the formula as i can only find it with psi and imperial units on google. Also I have the shaft diametre of 4mm, I...
  41. T

    Why would more RAM of same type/speed not work?

    I know what type of RAM I have: DDR3-PC3 12800 at 1600MHz. My laptop came with 2x4GB and I want to upgrade to 2x8GB and every resource I've found says 4GB per slot (and I only have 2 slots) is the most memory this laptop can use (...
  42. T

    Why doesn't my new RAM work with my ASUS M4A785TD-V EVO motherboard?

    My motherboard is the ASUS M4A785TD-V EVO. I decided to get som more RAM for it, and went for 16 GB (4x4) by Crucial: http://www.crucial.com/uk/store/mpartspecs.aspx?mtbpoid=E8F809A0A5CA7304 After installing it my PC didn't want to boot. It revs up and all, but the screen never gets a...
  43. R

    Ram Speed vs. Latency: What Matters for Gaming PC Performance?

    What should I be looking for if I'm buying ram for a gaming pc, higher speeds or lower latency or is it all just a bit academic and doesn't make that much real life difference apart from benchmarking?
  44. N

    Anechoic chamber, RAM, and faradays cage

    Hi, I was reading about anechoic chambers for performing tests of RF equipment, and read that they are usually screened rooms, built as a Faradays cage (Grounded, closed metal structure) in order to block radiation from the outside, and stop radiation escaping. But also they coat the...
  45. P

    Faulty Bios, Motherboard, RAM ?

    My friend's computer restarts after the BIOS screen. There's only one key to press, F2 on the BIOS Screen. Windows XP SP 2 never opens. He says that the problem began after his computer shut down after a power cut. His UPS was not well then. So, he put it on direct supply. What should I do to...
  46. N

    Testing RAM on Board using Machine Assembly Code

    I'm currently taking a Microprocessor course and we are adding to our breadboard week by week. The most recent add on was a UT6264CPCL RAM chip. Other chip specifications are given below in in 2. Homework Equations . My question is, how do we test to make sure that the RAM is working using two...
  47. C

    Mathematica How can I manage memory usage while plotting 3D functions in Mathematica?

    I'm trying to plot some 3D functions in mathematica, but each time I evaluate the cell, more and more RAM gets eaten up. How do I clear the memory to keep this resonable? My PC almost crashed because I ate up all the memory. I tried ClearAll and ClearSystemCache[] and it didn't work. I'm new...
  48. N

    RAM and sleep: how do they work?

    I have two questions with which I'd appreciate some help: (1) What are the pros and cons of leaving my home PC in SLEEP mode instead of "SHUT DOWN" (shut off)... I tend to leavge it in sleep mode for portions of the day and wonder if I should bother shutting it off for the night. (2) I...
  49. P

    Why Does My Computer Show 0.99 MB RAM

    Today, while I was exploring my system properties, I found that my computer shows only 0.99 Mb RAM. But I have 1 GB of RAM and I have Windows XP SP2. Why does computer show 0.99 Mb ?
  50. Chronos

    Troubleshooting DoA RAM Chip: 3x2 Tri Channel Set

    I purchased a 6gb set [3x2] tri channel ram chips. One of the chips is apparently doa. It appears replacing it with an identical 2gb chip is not necessarily guaranteed to work. Any suggestions?