Well, if the system is working fine then I would not really mess with it. Is it cheap memory? sure but if it works, hey who cares. Could you higher performance with say Crucial memory maybe depending on what programs you are running. You might want to do some benchmark tests and post them here so I can see your scores and we can compare.
Crucial Performance Lab
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When responding please provide your full system specs; hardware and software, OS, BIOS, drivers Etc. You can e-mailmemory related questions to firstname.lastname@example.org