Random lag spikes in some games.

I get lag spikes in some games i play on my PC. Like for minecraft for example. I spawn in on a world and it lags badly at the start then stops in 10 seconds but as i adventure out even further it gives off lag spikes from time to time. Does anyone know how to fix this or tell me what changes i would need to make to my PC build/is there a bottleneck?
My pc build:
CPU: Intel Core i5-3470 Quad Core 3.20 GHz
GPU: Gigabyte geforce gtx 770 windforce 3x Oc 2GB
RAM: 2x4GB Kingston HyperX, 2x4GB Corsair Vengeance
Motherboard: MSI Z77A-G43
PSU: Corsair 750Watt CXM semi modular
HDD: 1TB SATA-III Hard Drive, 2TB Seagate Hard Drive
SSD: no
Case: CoolerMaster HAF X
OS: Windows 8.1 64-bit
audio: Realtek High Definition Audio
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More about random lag spikes games
  1. Try with only 2x4gb sticks its not recommended to mix brands like that the same time
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