Will getting an extra 4GB of RAM help me?

Processor: Intel Core i5-2520M processor (dual-core, 2.50GHz, 3MB Cache)
DDR3 memory controller (up to 1333MHz), Intel Turbo Boost 2.0 (3.20GHz), HT technology

Detailed specs about my laptop:
http://support.lenovo.com/en_PH/product-and-parts/detail.page?DocID=PD015731

Will going from 4GB to 8GB stop the FPS fluctuations and let me play/record at ~100 fps?

or should I just build a desktop

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