Why does the pc only recognize 1 ram chip at a time? Both slots work just fine. I purchased the exact same two cards specifically for this model, T5212. It will only read one at a time. It works if I use a 1GB plus a 512MB, but not both 1 GB's.
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You Gateway only supports up to 8 GB. memory. Hence it will not see your 5 GB. dimms
tops: 8129 MB (8 GB.). 4- 2GB. Adding the maximum amount of memory will improve performance and help extend the useful life of your system as you run increasingly demanding software applications in the future.
How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS. More information about OS memory maximums can be found at http://www.crucial.com/kb/answer.aspx?qid=4251.
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I'm assuming that your 2nd DIMM is the same type and speed as the 1st one you put in. If you are not sure, check and make sure that it is DDR2, 533MHz, PC4200.
If they are not the same, that is most likely the problem.
If both DIMM's are the same, remove them both and then put one of them back into DDR2 Slot 1. Start your computer and see if the computer recognizes the memory. Remove it and try the other DIMM in the same DDR2 Slot 1.
If both work OK, the problem is on your mainboard.
I'm not a guru, but your predicament is pretty simple. Depending on your OS (XP 32 bit, XP 64 bit, Vista), the OS will be able to recognize a certain amount of RAM. XP 64 Bit will be able to recognize up to 6GB of RAM. Vista, I have no Idea. 32 Bit, what you're seeing right now.
Sorry for wasting a bit of money on that last stick.
You have the wrong memory chip. The beep code you hear indicates that there is no memory or incompatible memory. The memory you need is PC4200, Which is a 533mhz chip. Memory has a frequency rating that is matched to the processor and motherboard. Not just any DDR 200 pin memory that fits will work, the frequency has to match or it won't work. The new chip should be labeled, make sure it reads PC4200 or 533mhz, if it reads anything else it's the wrong chip. If it is the right frequency chip, then you may have a bad memory slot, the chip is bad, or mislabeled. Here's a link to a memory configurator that gives the memory specs for your machine.
I had the same issue on this board where it came with a Samsung 512 MB 533 MHz PC2-4200 DDR2 DIMM. I put in a 1 GB Kingston with the same specs (533 MHz PC2-4200 DDR2) and it would not recongize the Samsung anymore with the system reading as 1 GB of RAM instead of 1.5 GB. Tried every configuration and would only see the Kingston. It would only see the Samsung if I pulled out the Kingston regarless of the slots I use. So, I just bought the exact same make/model of Kingston and it recognized that fine and the system now has 2 GB of memory (max this board allows). And, I had already installed the latest BIOS for this board from Intel before doing all this so wasn't an old BIOS. I'm figuring the board didn't like something about the Samsung memory (speed, module configuration, etc.) that made it not play nice with the Kingston. If interested I bought the DM8400A/1G Kingston modules. And, this board appears not to support dual channel memory. Only has channel A, slots 0 and 1, and I read need two channels to support dual channel (seems obvious). Boards that supports dual channel memory normally have 4 memory slots, two for channel A and two for channel B, then put in matching modules in slot 0 for channel A and B and have dual channel memory access. And if want more ram, then matching modules in slot 1 for channel A and B.