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Question about EliteGroup P4VMM2 Motherboard

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RAM Support I have a DDR 256MB PC266 RAM attached to my board, I got a 128 MB PC333, is it possible for me to have both in one board?? Tried it once it was working but I might bust my board.. Thanks...

Posted by baju abad on

  • baju abad Jul 30, 2007

    hi, thanks for your reply, so what would be my total speed?? 128+256= 384 minus the shared memory?? I'm sorry didn't get what you mean by "it always runs on the slowest speed. Do you mean the 266 Mhz processing speed?? Thanks...

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If it works there is no problem, as the system would not boot up, but your memory will run at the slower of the two speeds, which will be PC266 and not PC333, as the faster speed ram is backward compatable because it always runs on the slowest speed.

Posted on Jul 30, 2007

  • Anonymous Jul 30, 2007

    Yes your total ram will be 384mb, but the speed will be DDR pc266 as this is the slower of the two peices of ram, or the old equivelant to pc133

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I have heard that a PC333 DDR ram can also run in a PC266 DDR ram supported motherboard but in a "slower speed", what does this mean? Let's say that If I use a 512MB PC333 on a PC266 DDR Ram...

You will get 512 Mb of memory but it will run at the slower bus speed. Think of it like this. Your memory is your car. Your car has the ability to go faster, depending on how fast the motor allows it to go. Unfortunately, everywhere you drive has a speed limit. Regardless of how fast your car CAN go, you are only able to drive the speed limit. That's kind of what is going on with the bus speed situation.

Bus speed determines how fast the memory and cpu can transfer data between one another. The higher the bus speed, the more information it can transfer at a quicker rate. If your memory is capable of transferring at a rate of 333 MHz but your motherboard can only support 266 MHz you will surely have the 512 Mb of ram but it will only transfer at the motherboard supported speed of 266 MHz as opposed to the full speed that the memory is capable of.

Hope this helps. If it did help you, please give it a thumbs up.
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Wanting to findout what kinda ram i need to get for an upgrade. this computer only has 256mb.

SDRAM (Synchronous DRAM)
Almost all systems used to ship with 3.3 volt, 168-pin SDRAM DIMMs. SDRAM is not an extension of older EDO DRAM but a new type of DRAM altogether. SDRAM started out running at 66 MHz, while older fast page mode DRAM and EDO max out at 50 MHz. SDRAM is able to scale to 133 MHz (PC133) officially, and unofficially up to 180MHz or higher. As processors get faster, new generations of memory such as DDR and RDRAM are required to get proper performance.


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DDR basically doubles the rate of data transfer of standard SDRAM by transferring data on the up and down tick of a clock cycle. DDR memory operating at 333MHz actually operates at 166MHz * 2 (aka PC333 / PC2700) or 133MHz*2 (PC266 / PC2100). DDR is a 2.5 volt technology that uses 184 pins in its DIMMs. It is incompatible with SDRAM physically, but uses a similar parallel bus, making it easier to implement than RDRAM, which is a different technology.
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Hp system board

the machine uses ddr 1 memory and hold a max of 2 gb of ram


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