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Upgrading memory from 512 mb ddr to 1 gb ddr

Hi, I recently bought a memory upgrade from simpletech at sam's club that reads like this on the front- 1GB PC 3200 DDR 400 compatible with ddr 2700 and ddr2100, And I bought it for a Sony Vaio PCV-RX660 wich has 512 MB PC 2100 DDR. I figured that it would work for it but when I go to the simpletech website to see what memory upgrades work for my computer it doesn't list what I got as an option. It actually only lists 512 MB sticks. So before I rip open the package I  would like to know if it can be used on my computer or not, And if it can do I have to remove the 512 mb or can I use both together in a certain order in the slots ?
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cyrax01
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cyrax01
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cyrax01Author Commented:
I forgot to ask whether using another 512 MB stick would work better or if it really isn't worth it to upgrade the memory on my computer due to other hardware limitations ?
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jamietonerCommented:
According to the specs for the system the 1gb stick wont work. Your system does support a max of 1gb but only with 2x512mb sticks.
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cyrax01Author Commented:
Ok, so does any 512 MB DDR stick work or do I have to match it to the one currently installed ?
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jamietonerCommented:
I would suggest matching it as close as possible. I have seen 2 sticks of ram with different spoecs work fine with each other and i have seen it cause all sorts of issues.
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cyrax01Author Commented:
Do you suggest I just replace the one installed and get two completely new ones if I can't find one close enough to it ?
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jamietonerCommented:
if you cant get one close to the same speed and timings then yes., it will most likly save you a headache in the longrun
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nobusCommented:
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cyrax01Author Commented:
Thanks for all your help!!!!
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