I have installed 4 GB of RAM but it only shows 3 GB RAM

Pull up a RUN box. Windows key plus R. Then type in cmd and hit enter. Next, using the command prompt that has appeared, type in wmic memphysical get MaxCapacity, MemoryDevices

Hit enter.

Copy the number you see and devide that by 1048576
You can actually do that in the address bar of your browser.
That will give you the maximum gigabytes your computer will run.

https://www.maketecheasier.com/how-to-find-out-maximum-ram-capacity-of-computer/

There are 4 RAM slots. 2 are taken and 2 are free. To upgrade to the maximum amount of RAM you need to place 2 sticks of 4 GB on the free slots.
DDR3 PC3-12800 • CL=11 • UNBUFFERED • NON-ECC • DDR3-1600 • 1.35V • 256MEG X 64 •

If you have difficulty doing it and you find yourself in London you can visit us https://www.computerbeing.co.uk/

your comp can only handle so much ram,you also need to use the same ram,check how much ram it recognizes with only two,then 3,then 4,64 bit comps only recognize 4 gb,32 bit recognizes any gb ram.

The POST beep code - 3 short beeps mean RAM failure.
Try reseating the RAM modules.
If this does not solve your problem then remove all the RAM modules and insert one RAM module at a time into memory slot 0 (1st memory slot) to determine which is the faulty RAM module.

I assume that you've booted the computer with _ONLY_ the 512MB stick installed, and that the computer recognized it (reporting either 512MB or 384MB), i.e., the 512MB RAM is not "defective".

Hmm. 1024 minus 896 is 128.
So, the "integrated-into-the-motherboard" video-card is "stealing" 128MB of your RAM, to be used strictly for "video" purposes, leaving 896MB for Windows to use.

Now, about the "missing" 512MB of RAM.

1. If you have four slots for RAM, and they are physically arranged into two pairs of two slots, rather than four equally-spaced slots, your motherboard is capable of "dual-channel" mode. But, since your two sticks of RAM are not "matched" (size, speed), you _MUST_ insert both sticks into _ADJACENT_ slots (not slots 1/3, nor slots 2/4), in order to run your RAM in "single-channel" mode.

2. If you have two slots for RAM, interchange the two sticks, to see if that makes a difference.

nope, 1 slot can only accomodate 2gb of ram. and also take NOTE that 4gb can only be read if the windows is running 64bit ,now if the system is running 32bit and there are 4 gb of ram installed on the system . The system will only read 3 or 3.5 gb of ram.

put the new ram in slots 2 and 4.

Slots 1 & 2 are channel 1 slots 3 & 4 are channel 2, you need matching sets in each channel to run dual channel mode.

These are the spec of memory you can use .
If it does work by itself it might be defective of not compatible with yous system.

Thank you

Memory Installed 512 MB (2 x 256) Maximum allowed 4.0 GB* (4 X 1 GB) requires the replacement of the installed 256 MB DIMMs

*Actual available memory may be less Speed supported PC3200 MB/sec Type 184 pin, DDR SDRAM DIMM slots Four Open DIMM slots Two

1.make sure your monitor is plugged on the video card.
2.check *********** board manual for videocard slots.
3.check your videocard if they nid extra power from four(4) pin
female power cable or six pin female power cable.
4.try using another monitor.. or TV XD

Ok, I got it, Ur motherboard supports upto 8GB DDRII Dual channel

Try using these RAMs on other slots of the board to check if there is a problem with RAM Slot (As there are four slots on ur board).

If no success, try using RAMs on some other system to confirm whether problem is with RAM or Motherboard.