Computer configuration:   CPU: Intel Core i5-7600K, 7th gen MB: ASUS H110I-PLUS, allows up to 2 DIMM slots, max. 32GB and 2400MHz RAM: Corsair Vengeance LPX, 32GB (2x16GB), 2400MHz, CL16, 1.2v (CMK32GX4M2A2400C16)   Research done:   Meets MB requirements:  Is not officially tested by ASUS, but that does not mean it is not supported:  Tried also when "memory isn't detected":  Installed BIOS version is 4212 (latest currently):  Both DIMM slots and the RAM modules are functional.   The problem:   One DIMM boots flawless. Two DIMMs starts up the computer with no beep, no display, no boot, no HDD sound activity. Why?
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I'm looking at rather short QVL lists from manufacturers, and I'm wondering what is the underlying cause of RAM incompatibility aside from the obvious: Obvious Reasons for Incompatibility  RAM Generation (DDR, DDR2, DDR3, DDR4) Form Factor / pin count RAM Type (ECC vs Non-ECC, Registered vs not, Buffered vs not) Minimum speeds on a board that cannot adjust the memory frequency Non-standard voltage range on a board that cannot adjust the memory voltage Channel count (single vs dual vs quad) Bad or inoperable module Mismatched set  Not Obvious Reasons  Brand SKU Max Capacity Speed too high  As in, why can't motherboard manufacturers just list the specifications of the RAM they will accommodate, and support every memory chip of that category instead of listing specific SKUs from specific brands? What happens electrically/physically that causes boards to fail to POST / operate with RAM that is otherwise 'compatible' with all of the specifications of RAM that is on the QVL?
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I have recently upgraded a Windows 7 Home Premium PC with 12 GB of RAM. For some reason once I looked in the System tab it said only 7.96 GB of 12 GB of RAM is usable. I have already tried to go into the msconfig to see if the Maximum Memory was ticked, which it wasn't.  Is there a solution to this error? The other topics that I have viewed on Super User did not help me at all.  Installed RAM:   msconfig:   My Windows Edition is showing "Home Premium":   Resource Monitor:
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I have recently purchased 8&nbsp;GB of RAM to upgrade my system to go along with a new shiny i5!  When I run speed checks on my system online I get told I only have 3.5&nbsp;GB of RAM, also in  I only see around that value of RAM yet that stupid Windows rating index tells me I have 8.0&nbsp;GB.  Am I doing/reading/interpreting this incorrectly?  See below what I see:
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My wife put my PC into sleep mode, I could not wake it up. I just got a signal on monitor saying "no signal input".  When I'm trying to boot up, I am getting two short beeps, followed by eight short beeps, then it continues to appear to load up.   I turned off the power to the PC and held the start button for 60 seconds. I also took side cover off, checked all connections, reseated ram, graphics card, also took out the battery and reset the BIOS, still nothing.   Any ideas? The PC is running Windows Vista.
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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 some more info:    Here is the RAM I'm looking at:    It all looks compatible to me, I just was curious about the four channel thing.
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So I have a  which I need to buy RAM for.  Now the specs say that it supports DDR3-L.  I am thinking of getting the following kit:  CORSAIR Vengeance (2x8) 16GB 204-Pin SO-DIMM Model CMSX16GX3M2B1600C9 DDR3 1600 (PC3 12800) Cas Latency 9 1.35V (also supports operation at 1.5V) Dual Channel Kit Timing: 9-9-9-24   My question is whether this will work for a slot that is specified as DDR3 L?
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I just upgraded my computer's RAM, adding another 4 GB to the computer.  Windows 7 acknowledges that 8 GB is installed, but says only 7.5 GB is accessible.  Any idea why? I thought since I had the 64-bit Professional version this wouldn't be an issue.
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I currently have a  8GB DDR4 RAM. I want to upgrade my system to have 16 GB RAM. I already have bought the  8GB DDR4 RAM.  I understand that my current RAM is a single-rank RAM and my new one is dual-ranked RAM. My question is can I plugin the new RAM into my MOBO and expect everything to work harmoniously?  My MOBO is a MSI Gaming Z170A M5.
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I am having windows 10 pro 64 bit OS,With 4 Gb RAM. But in memory section its showing 2.66 GB usable. Why? doing some research(Googling) I found that 32 bit machine can't utilize the full RAM. But though I am having 64 bit machine, still why its showing 2.66 GB usable? I tried a tweak through MSConfig &rarr; Boot &rarr; Advanced option &rarr; unchecking but nothing is working.  ------------------ System Information ------------------        Time of this report: 6/3/2016, 08:39:50          Operating System: Windows 10 Pro 64-bit (10.0, Build 10586) (10586.th2_release.160104-1513)                  Language: English (Regional Setting: English)       System Manufacturer: LENOVO              System Model: 20351                      BIOS: InsydeH2O Version 03.73.069ACN28WW                 Processor: Intel(R) Core(TM) i3-4030U CPU @ 1.90GHz (4 CPUs), ~1.9GHz                    Memory: 4096MB RAM       Available OS Memory: 2722MB RAM                 Page File: 3268MB used, 1885MB available               Windows Dir: C:\WINDOWS           DirectX Version: 12       DX Setup Parameters: Not found          User DPI Setting: Using System DPI        System DPI Setting: 96 DPI (100 percent)           DWM DPI Scaling: Disabled                  Miracast: Available, with HDCP Microsoft Graphics Hybrid: Not Supported            DxDiag Version: 10.00.10586.0000 64bit Unicode   --------------- Display Devices ---------------           Card name: Intel(R) HD Graphics Family        Manufacturer: Intel Corporation           Chip type: Intel(R) HD Graphics Family            DAC type: Internal         Device Type: Full Device          Device Key: Enum\PCI\VEN_8086&amp;DEV_0A16&amp;SUBSYS_380C17AA&amp;REV_0B      Display Memory: 1473 MB    Dedicated Memory: 112 MB       Shared Memory: 1361 MB        Current Mode: 1366 x 768 (32 bit) (60Hz)
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I noticed that my MacBook Pro 5,5 middle 2009 is very slow so i thought i had some malicious software in it but today i went to check something about the hardware in the computer under "About this Mac" and i noticed that i only had 2gb RAM which is wrong because i have 2 RAM memories of 2GB each. So i opened the laptop and started trying some stuff. I removed one of them and the computer didn't even start i just got a beeping sound. But when changed the memory to the other RAM Slot the computer started with 2GB RAM as always and in conclusion both RAM memories are fine. It seems that one of the memory slots is fried. Only way i found to check if one of the slots is broken was to do a memtest so i ran the command memtest all but i got no errors and the system didn't freeze. The question is: how could i see if the RAM Slot is broken besides doing this memtest?  Additional info: in december i put the laptop to charge at work, after an hour or two i noticed that the laptop was so hot that i almost couldn't even grab it, i could fry eggs on it. But nothing else happended it was working as usual. Maybe that's the reason why this is happening. So once again, how could i check if the memory slot is broken and in case it is how could i fix it?
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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 module?  Another question, can I mix MHz values, like that I have two 667MHz modules and two 1066MHz modules? Is this dangerous for the comp?
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I have a new HP Z800 Workstation, running Windows 7 Enterprise 64 bit. Z800 Specs are .  The machine has 4GB of RAM -- windows reported 1.99GB available, 2GB was "hardware reserved".  I added another 2 GB and windows reports that there is 6GB of physical RAM, but now 4GB is "hardware reserved".  The BIOS sees the full RAM amount as well.  The video card is an nVidia Quadro FX 580, so it shouldn't be using any shared memory at all.    Why is all my extra RAM marked as "hardware reserved" in Windows 7?
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I was browsing for a RAM upgrade earlier for my system, and came across 'AMD-only' RAM (aka, RAM that only works on AMD chipsets).  This RAM can , and seems to be slightly cheaper than 'normal' RAM.  The RAM prompts a question: is this RAM really restricted to AMD chipsets?  When considering RAM for a system, there are certain considerations to make such as:   Speed (1066MHz, 1600MHz, etc); CAS (latency, lower is better); Generation (DDR2, DDR3, DDR4, etc)   However there is usually no such consideration as chipset compatibility. Sure, it's possible to guarantee that a given stick of memory will work if it's within the bounds of the chipsets listed in the information given by the seller/manufacturer.  For instance if a series of chipsets supported RAM between 1600MHz and 2400MHz, with 9-12 CAS, and on DDR3, it would be possible to list a product as being fully compatible with that series of chipsets if the said RAM was 2000MHz, 10 CAS, and DDR3.  I suspect that's partially the story here. However, is it possible at all for a given stick of memory to be 'AMD-only' or 'Intel-only', and if so, how?
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I'm building a Core  system which supports dual-channel memory (up to 16&nbsp;GB in four DIMMs), my target is 8&nbsp;GB. From the performance perspective, is it better to have two times 4&nbsp;GB or four times 2&nbsp;GB?
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The specifications of my system say it supports 400 MHz and 533 MHz DDR2 unbuffered SDRAM. I have a 1 GB DDR2 PC2-5300 laptop RAM module. Can I use this in my desktop? If not, what exactly is the difference between desktop RAM and laptop RAM?
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I have 2 8gb RAM sticks on my motherboard. One is faulty on some bytes and is giving me BSOD once in a while.  Is it possible to disable one of them without removing it physically? I want to keep it inside the motherboard as I dual boot with Xubuntu and I can block the fauly bits there, and as far as I know, it is impossible to block them in Windows.
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I have a Windows system and when I turn it on everything runs and turns on but the monitor stays black. No BIOS shown or anything. Ideas?  This is also a brand new system. No more then a year old running an i5.  Could it be powersupply?