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Upgrading ram modules on dv4-2145dx

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              Hello I need a little help about upgrading the ram for dv4-2145dx I need to know two things,first I had tried to unscrew the memory plate or cover but so far the cover just doesn't come off and it just does a clicky sound of sorts even though I had unscrew it and hence I can't access or substitute the ram modules.Second which kind of ddr2 memory module can I use with that laptop can it be 667 or 800 or lower.Well that's all my questions anybody who can help me on this issue I will truly preciate it and thanks for your attention have a great day.    

Answers

I've used the Kingston brand on all my mac (ibook 700mhz G3,1.25DDR, 1.25 DP DDR & G5 DC. So far no problem. I recently purchased matched pair of 1gig (2 gi)DDR2 533mhz @ micro center, coast me $235.00. I was thinking about getting a seperate module. But I remember reading somewhere that for trouble free, better get the matched modules. 1gig x 2 per package = 2 gig or 512 x 2 = 1gig. I rather use brand for less head ache (so far).

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