So I have the p4m00pro-m478 version 1.1 motherboard and recently I decided to switch from 1 GB of DDR to tow 1 GB sticks of DDR2 533 which it says the board can handle. My problem is the computer is only recognizing 1 GB as being in there. I thought maybe one slot is bad so I tried starting the computer with only 1 slot in one spot and it was fine so I moved it to the other slot and restarted it and it was still fine, but with the 2 in there together it still only shows I have 1 GB?
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i had a look at your main board. it is capable of 2gig RAM (maximum). your issue is typically related to the type of RAM you are using. your posting does not indicate the RAM model. you have to make sure the RAM
you are using is double sided (has chips on boat sides of it). older
mother boards have problem addressing the full capacity of single sided RAM, so it reads only half of it.
good luck. if this was helpful please vote for me.
The schematic layout of the P5VDC-MX on the user manual shows that there are 4 DIMM banks, set as 2 X 2 rows, 2 DDR2 and 2 DDR.
The user manual explicity states:
I am running different frequency modules without any problems. With the info above provided by ASUS, it may be possible that a fix could be available with a BIOS update. Otherwise, you can opt to use a lower capacity RAM along with your 1GB Corsair.
Your mobo is quite old and its chipset can only support a maximum of 512MB PER SIDE (technically called a bank) of a memory module. I would guess that your 1gb memory module has 8 chips that are all located on one side of the module, putting all of the 1 GB on one bank. Thus, only 512MB of your 1 gb RAM is detected and usable by your motherboard (the remaining 32 mb is most likely being used by your onboard video). You'll need to find a double sided 1 gb memory module (usually 8 chips on each side).
re-examine the memory chips.... sometimes swapping slots (still ddr2 slots) will fix the issue. the other possibility might be that you have to set them up in the bios ... if you happen to have the manual for that board.... make sure there isn't supposed to be a jumper on the motherboard that needs to be changed as well.... some ideas to try... in the mean time i'll go look and see if i can find the manual myself and perhaps i'll have found it.
check the voltage on your new ram.
For ddr2 you need both slots filled.(this the memory I would use)
Make sure you put it in the right slots.
make sure that BIOs recognises each stick.
Let me know if these work for you.
This mother board will take either DDR or DDR2 but not both at the same time. It is stated clearly in the user manual. So if you already have 1 stick of DDR just get another stick DDR also and not DDR2.