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The other day I tried to view the meminfo by giving command on shell:
$ cat /proc/meminfo
/***Here was the output***/
MemTotal: 343164 kB
MemFree: 21440 kB
Buffers: 48 kB
Cached: 42824 kB
SwapCached: 0 kB
Active: 120940 kB
Inactive: 141408 kB
Active(anon): 106776 kB
Inactive(anon): 125856 kB
Active(file): 14164 kB
Inactive(file): 15552 kB
Unevictable: 11592 kB
Mlocked: 11224 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 231092 kB
Mapped: 39852 kB
Shmem: 12776 kB
Slab: 15976 kB
SReclaimable: 3036 kB
SUnreclaim: 12940 kB
KernelStack: 6552 kB
PageTables: 16444 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 171580 kB
Committed_AS: 2668440 kB
VmallocTotal: 524288 kB
VmallocUsed: 184664 kB
VmallocChunk: 283652 kB
Need Answer from SE people/moderator about why the RAM is 335 MB, which is so less than 512 MB (177 MB less), as claimed in the product specs?
Request you to please address this asap, otherwise it will definitely badly hit the Sony/ Sony Ericsson Brand credibility.
Awaiting Reply...
Neo v has more internal memory than arc :smileygrin:
420mb ..whereas arc as you show has 380mb 
you wanna fight over this

:smileygrin: :smileygrin: :smileygrin:
SE developers and Moderators ..please reply...Waiting!!!
The command "cat /proc/meminfo" only shows available RAM, not actual physical RAM. Therefore you get these figures.
The main things that consumes RAM as default is graphics, kernel and Android OS.