system information shows wrong amt of RAM installed

January 23, 2012 at 12:06:33
Specs: Windows 7
I recently upgraded my PC from 512ram to 2.5gig - I have 4 slots and I installed 2 1gig and the original 512 (2x 256) I had in it. I noticed that when I went to my system information, it says I only have have 1.5g of RAM installed. Any ideas? thanks!!

See More: system information shows wrong amt of RAM installed

Report •


#1
January 23, 2012 at 12:09:53
Check the bios for an accurate number. You may have onboard video that's using 1 gig of the memory.

Report •

#2
January 23, 2012 at 12:14:33
Rum memtest.

Katy Perry, I'd never treat you badly.


Report •

#3
January 23, 2012 at 12:19:43
Remove RAM sticks one at a time, could be faulty socket or RAM

A thank you would be nice, if I have helped.


Report •

Related Solutions

#4
January 23, 2012 at 13:27:10
As so many posters do (or don't do), you didn't list your system specs, make/model of motherboard, or any details about the RAM. Are you sure your board supports 1GB per slot?

Report •

#5
January 25, 2012 at 11:58:15
ok..here is what I can tell you so far.
@ grasshopper- I don't think memory is taking up 1gig, as I have a PCI video card so I can run dual monitors.
@clive_pearce- When I got the new RAM I had taken out the old ones to test the new ones, then added the original ones back in, so they have all been taken out. What would be the best way to determine if it is a faulty socket/RAM? actually, the new RAM is in the slots which the original RAM was in, so I know the slots work.
@ryder- I am familiar with looking up system specs..I read the manufacturer's info and it says it supports up to 1gig/slot.

Report •

#6
January 25, 2012 at 16:43:01
How much RAM does it show in the BIOS ?

Report •

#7
January 27, 2012 at 02:33:04
i forgot to check the BIOS and I just did..it seems one of the slots i have one of the new 1gigs in is showing not installed. I'm gonna open my pc up again and re-check everything. i was going to do this anyways but I didn't want to deal with unplugging cables and stuff AGAIN. is there anyway to tell which slot is 0 and which is 1 when looking at it? I don't like touching RAM if I don't have to.

Report •

#8
January 27, 2012 at 05:24:28
Many motherboards have this printed on the board.
Remove and reseat the memory sticks 4 or 5 times as this will rub up the contacts and it may be enough to clean them off. If the system is unplugged and you ground yourself first, you should be fine handling the components.

Run Memtest86 with a few different configurations of the memory including each of the new sticks one at a time in each slot to test for both the memory and the slots being bad.

You have to be a little bit crazy to keep you from going insane.


Report •

#9
January 27, 2012 at 12:15:21
System Information shows the Physical amount of ram the mboard's bios detects.
If the mboard has onboard video and if you're using it, the figure is usually the total amount of ram the bios detects minus the amount being shared with the onboard video.

" have a PCI video card "

Installing a PCI video card usually DOES NOT disable the onboard video if your mboard has that. If you look in Device Manager in that case, both the onboard video and the PCI card video may be listed. If the onboard video is still listed, the bios may still be sharing some of the ram with it and the onboard video port may still be producing video.
Yoiu can Disable the onboard video in that case in Device Manager (uninstalling it won't work - it will come back after you restart the computer), however the ram will probably still be shared with the onboard video in the bios.
......

Ram that works in another mboard , or any ram you buy or have lying around, may not work properly, or sometimes, not at all - even if it physically fits and is the right overall type (e.g. SDram, DDR, DDR2, etc.; PCxxxx, xxx mhz) for your mboard. In the worst cases of incompatibilty your mboard WILL NOT BOOT all the way with it installed, and the mboard may not even beep - the ram has to be compatible with the mboard's main chipset, or in the case of recent mboards, compatible with the memory controller built into the cpu.

See response 5 in this for some info about ram compatibilty, and some places where you can find out what will work in your mboard for sure:
http://www.computing.net/hardware/w...
Correction to that:
Mushkin www.mushkin.com

Once you know which module ID strings (part numbers) work in your mboard, you can get them from anywhere you like that has ram with those ID strings.

If you have brand name ram, it is usually easy to look up whether it's ID string (part number) is in a list of compatible modules found by using your mboard or brand name system model number.
If the ram is generic, that may be difficult or impossible.
.....

Some ram manufacturer's modules do not strictly adhere to the JEDEC standards that most mboards bioses use to determine ram settings.
In that case, the ram settings in the bios Setup that the bios has automatically chosen may not be correct.
Check the ram settings in your bios - the ram voltage, and the ram timing numbers - those should be the same as for the specs for the modules themselves. Often the ram voltage and timing numbers are printed on the label on the modules.

If the voltage setting or timings settings in the bios are different from the specs for the ram, change them in the bios. The timing numbers must be as close as you can get to the same, or slower timings (higher numbers = slower) - you won't notice the difference the slower settings make.

If you have a mix of different modules
- don't mix ram that different voltages are specified for - the bios will force the ram to use the lowest voltage, if "by spd" or similar is used (default settings) - ram that a higher voltage is specified for is more likely to not work properly in that situation.
- the bios settings must be those for the slowest timing settings of all the modules, or slower (higher numbers = slower).

You MAY be able to custom set the ram voltage to the higher ram voltage in the bios if you do NOT have the bios set to detect the ram "by SPD" or similar, however, you must NOT exceed the max voltage range for the modules that require a lower voltage, and that can be hard to determine, unless you can find detailed specs - e.g. if the ram is Kingston ram that doesn't have a brand name system specific part number, that info is easily found.


Report •

#10
March 29, 2012 at 19:18:17
@ tubes and wires-- of course the RAM is the correct type or none of the new sticks i installed would work at all...it's a matter of the full 2gig not working..only have does. also, i don't think the video mem is a problem, when i first got the PC it had 512 installed and all 512 showed up in the system info.

Report •

#11
March 29, 2012 at 19:31:02
As I said in response 9, people often think they have installed ram that is 100%compatible with installing it in the mboard when they DID NOT !

"Ram that works in another mboard , or any ram you buy or have lying around, may not work properly, or sometimes, not at all - even if it physically fits and is the right overall type (e.g. SDram, DDR, DDR2, etc.; PCxxxx, xxx mhz) for your mboard. In the worst cases of incompatibilty your mboard WILL NOT BOOT all the way with it installed, and the mboard may not even beep - the ram has to be compatible with the mboard's main chipset, or in the case of recent mboards, compatible with the memory controller built into the cpu."

E.g. if the ram module has 8 chips on one side rather than 16 - 8 on each side - only half the ram on the module may be recognized on older mboards. In that case if you remove one 1 gb module there will 1 gb total detected along with the two 256 mb modules.


Tell us the brand and the manufacturer's part numbers of the 1gb modules you bought !

As riider said in response 4:

"As so many posters do (or don't do), you didn't list your system specs, make/model of motherboard, or any details about the RAM. Are you sure your board supports 1GB per slot? "

Even if your mboard manual or the specs for the model say you can install 1 gb per slot, in some cases you can't populate all the slots if you're using the fastest ram the mboard supports and have them all be recognized !
In that case if you remove one 1 gb module there will still be 1.5 gb total detected along with the two 256 mb modules.

We can probably tell you why you're having the problem you're having if you supply that info ! !

Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard.

The model, sometimes the make, of a mboard in a generic desktop system is usually printed on the mboard's surface in obvious larger characters, often between the slots.

The specific model of a brand name system is often shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site and loading a program they have available, if Windows is still working, on the subject computer.

If it's a Dell computer...
Go here for how to find the Service tag "number":
http://support.dell.com/support/top...

Tell us what it is.

If it's a HP or Compaq computer.....
Go here:
http://partsurfer.hp.com/search.aspx
Scroll down a bit.
Look for the similar label on the outside of your computer.
Quote the specific model number - that's at the end of the first line.
Quote the Product number - that's on the third line.

If it's a Lenovo computer
Find your specific Product number and tell us what it is:

Finding my product number
http://support.lenovo.com/en_US/Fin...


If it's an Acer laptop or netbook
Where is the model number located on my notebook or netbook?
http://acer.custhelp.com/app/answer...

Where is the serial number located on my notebook or netbook? (part two)
http://acer.custhelp.com/app/answer...

If it's an Acer desktop computer
Where is the model number located on my desktop?
http://acer.custhelp.com/app/answer...

Where is the serial number located on my desktop? (part two)
http://acer.custhelp.com/app/answer...
.....

"I don't think memory is taking up 1gig, as I have a PCI video card so I can run dual monitors."

If a mboard has onboard video as well, installing a PCI video card in a slot DOES NOT disable the onboard video. It's still sharing ram installed in the mboard .
.....

"What would be the best way to determine if it is a faulty socket/RAM? "

It's extremely unlikely there's anything wrong with any of the ram slots, but
- the ram MUST be properly seated.
- ram slots that haven't had ram in them may have accumulted crap in the bottom of them that's hard to see - you may need to blow them out.
You know two of the ram slots and the two 256 mb modules work fine. Try the two 256 mb modules in the other two slots to see how much total ram is detected
.....

I'm assuming there's nothing wrong with any of the ram slots, all the modules are seated properly, and there's nothing wrong with any of the modules

Download CPU-Z
http://www.cpuid.com/softwares/cpu-...

Install it, run it.

Clicking on the Memory tab tells you the settings the bios is using for all the ram and how much total ram it's detecting.

By default, the bios uses the lowest voltage, and the slowest ram timing settings, of those specified on the SPD chips of all the modules.

If any, but not all, of the modules are specified to use a higher voltage, the one or ones that a higher voltage is specified for will probably not be detected properly.
....

Clicking on the SPD tab tells you what specs each of the modules (in Slot #1, Slot #2, etc.) have specified by the manufcturer for them on their SPD chip

If all the modules have the same voltage specified for them but the total amount of ram detected by the bios is less than the total of the module capacities, either one or more of the modules are incompatible, or there is some main chipset limitation that prevents the total from being detected.

When you install only one 1 gb module, how much total ram is detected ?

When you install only two 1 gb modules, how much total ram is detected ?

When you install only two 1 gb modules and one 256 mb module, how much total ram is detected ?


Report •

#12
March 30, 2012 at 12:10:07
yeah i fixed it. i ended up just opening my PC back up (which I wanted to avoid because it involved moving furniture around) and I think one of the sockets just had some crap in it. They were seated fine but I took them both out again and used some canned air and when I replaced them it worked fine. thanks for all the suggestions everyone.

Report •

#13
March 30, 2012 at 16:00:33
Next time do not overlook the obvious and assume there is something major wrong. Just use the process of elimination and check all of the probabilities first. Then if you still need help, include ALL system and component specs and ALL you have tried so far. This way we will not be telling you things you have already tried. This will save everyone time and effort.
By the way, glad to hear that everything is working.

You have to be a little bit crazy to keep you from going insane.


Report •


Ask Question