Question about EliteGroup P4M800PRO-M478 Motherboard

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Doesn't recognize DDR2 ram

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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  • Anonymous Jan 03, 2009

    I have the same motherboard. I have 2x 1GB DDR2 ram insterted but the system only detects 1gb. I have updated bios and that did not help.

  • Anonymous Mar 17, 2009

    The solution didn't work for me... Updated Bios version 08/030/07 but 2 gb ddr2 533 still read as 1 gb ddr2 533 and 1 gb ddr 2 read as 512 mb ... The ddr2 support of this mobo is buggy i think ... 2*512 ddr1 runs perfect (Time to upgrade)...



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I installed the 1GB DDR2 533 but upon startup it recognizes my RAM at half its capacity.

Make sure you use only ONE TYPE of memory modules - DDR -OR- DDR2... Both types CAN'T operate simultaneously!
Also, this motherboard support no more than 2GB in total...

Sep 18, 2010 | EliteGroup P4M800PRO-M478 Motherboard

1 Answer

I installed memory 1 gb 533 ddr2 kingston mHz, and the computer only recognizes 512 mb of memory. The memory is installed into the sockets of DDR2 memory and change the socket but the result is the same,...

hello jorge stoke

my name is ausi. i have just joind Fixya.

it is interesting you have had no reply yet.

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.

Sep 12, 2010 | EliteGroup P4M800PRO-M478 Motherboard

1 Answer

Asus p5 vdc-x motherboard not recognizing ddr2

Ok i am just guessing here

maybe your motherboard does not support

ddr2 rams and hence it wont boot up as it does not detect any ram in the slots......

try to boot with one old and one new ram (ddr and ddr2) and post the result

are you sure whether the ddr2 ram is supported?

Jun 30, 2009 | ASUS P5VDC-X Motherboard

1 Answer

Ram assurance

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.

Hope this helps.

Jun 24, 2009 | ASUS P5VDC-MX Motherboard

2 Answers

1gb shows 512mb only

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).

Mar 06, 2009 | ASUS P5VDC-MX Motherboard

1 Answer

Upgrade ram


this board is ddr so you will need ddr400 or pc3200 and a maximum capacity of 2gb so be carefull with 1 gb sticks as sometimes this causes system crashes

hope this helps

Regard Rik

Feb 26, 2009 | Intel D101GGC Motherboard

1 Answer

Switching ddr to ddr2 memory

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.


Dec 19, 2008 | EliteGroup P4M800PRO-M478 Motherboard

1 Answer

Can't Install RAM in DDR2 and DDR3 DIMM slots

You cannot use DDR and DDR2 ram at the same time, because its always been like that (ie, no SD and DDR, or SD and RIMM)

What you should do is switch to all DDR2 sticks.

Jan 09, 2008 | Gigabyte GA-8PE667 Ultra Motherboard

1 Answer

Upgraded Ram Issues

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.

Nov 30, 2007 | EliteGroup P4M800PRO-M478 Motherboard

2 Answers

Can 1 stick of DDR and 1 stick of DDR2 be used together

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.

Oct 13, 2007 | EliteGroup P4M800PRO-M Motherboard

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