Thread: High memory usage or faulty memory?

i've noticed significant slow-down in laptop's performance lately , believe it's due high memory usage and, consequently, swap usage which, combined slow hard-drive, makes laptop, @ times, unresponsive.
investigated.
have dell inspiron 6400 1 gb of ram.
seems memory usage @ 95%+ (970-980 out of 993 mb), not running; also, high usage seems unaccounted for. looking @ top, amount memory used processes doesn't add up: opera uses 10-20%, xorg 6-7%, compiz 2% , rest 1% or less.
rebooted , when getting gnome welcome screen, changed terminal , logged in cli session. when looking @ free , top, saw memory usage 850mb, no gui or programs running, usual services.
have apache , mysql running in background, after stopping them, memory usage remained essentialy same.
on other hand, on girlfriend's laptop, has 512mb of ram, when doing same thing, used memory 250mb, seems right.

now. if made far: possible memory faulty or should memory leaks?

did try memtest86 but, while wasn't able wait final result, @ 60% of tests done, showed no errors.

halp!

these results firefox , ordinary stuff running in background.

code:

blaz@modell:~$ free -m               total       used       free     shared    buffers     cached  mem:          3015        726       2288          0         22        341  -/+ buffers/cache:        362       2653  swap:         6534          0       6534

leave memtest running through night if nothing shows memory ok

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