Quadrant benchmark question?

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http://forum.xda-developers.com – OK, so I'm running a new ROM on my nex7. Smooth ROM to be exact, which I'm very pleased with. After installing the ROM I ran a quadrant benchmark and scored 4880. A couple days later, after side loading adobe flash player I ran quadrant again and scored slightly lower at 4872. My question is, is it normal that benchmarks will vary slightly or should my score stay exactly the same? Sent from my Nexus 7 using Xparent Green Tapatalk 2 (HowTos)