Question old ram not working in new mobo but works in others

Jun 18, 2019
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recently, I'v plugged q45t-am motherboard with my old working ram 4gb 800 Mhz.
When I turn it on the mobo start beeping, i tried another 2gb 1066 Mhz ram it worked fine , both rams look tha same having same pins, the mobo should be supporting 800, 1066,1333 Mhz fsb (ddr3)
.So why it is beeping and not booting with fine ram?

mobo has dual channel 2*2 slots I tried to plug only one ram each time same problem on old ram

bios up to date cpu:core 2 quad q9400
both are kingston ram and tested worked in other mobo

sent by internet explorer 😛
 
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