RAM detection problem

[rajeeshap]

Hi iam having HP Pavilion Media Center a1320in Desktop PC.
my motherboard specs..
http://h10025.www1.hp.com/ewfrf/wc/...&dlc=en&cc=us&os=228&product=1823355&sw_lang=

i bought my pc on 2006. at dat time it was having 256mb ram(533mhz DDR2 sdram).
then i bought 512 mb from other vendor. so it became 768mb. and it was working fine.
then i bought 1 gb ram.
now the problem is wen i use 1gb ram with 512mb ram or 1gb with 256mb ram, my windows detects only 1 gb ram. not the other rams.
like it should show 1.5gb(1gb+512mb) or 1.2gb(1gb+256mb).

On my 1gb ram its written
DNHMAU1GC6FER1 - A6
1GB PC2 - 5300U - 555
KOREA 0850

On my 512 mb ram
512M DDR2 533 DIMM 4-4-4
17 10 19- 5863 RoHS[JU]

On my 256mb ram
256MB 1Rx16 PC2 - 4200U - 444 - 12
HYMP532U64BP6 - C4 AB 0550

 

[kristin48616]

I believe the problem you are experiencing here is that when both 512MB ram chips are installed together the system wants to operate in Dual channel mode. That’s the reason.

 

[rajeeshap]

so now what i have to do.

 

[tarun dhoom]

i m having same 1gb ram and i want to know how mhz is my ram?

 

[kristin48616]

so now what i have to do.

I’m sorry to say that I haven’t got an idea to solve your problem at present. But I’m trying.

 

[brucethetech]

some ram chips are picky and only work with other chips just like them (i know some people like that) try using the matching memory sticks.