|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":
Tell us what it is.
If it's a HP or Compaq computer.....
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
If it's an Acer laptop or netbook
Where is the model number located on my notebook or netbook?
Where is the serial number located on my notebook or netbook? (part two)
If it's an Acer desktop computer
Where is the model number located on my desktop?
Where is the serial number located on my desktop? (part two)
"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
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 ?