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I've made my first custom build PC for my grandma. She doesn't really use it for gaming but her grandchildren do, and she didn't have much money to spare, so I've build a PC with an AMD A10 7850K without a graphics card, but with enough power to add one later. The PC has 8 GB of Corsair Vengeance RAM running at 2133 MHz.

The problem is that Minecraft lags at specific points, however, during normal gameplay it works just fine.

The Squid, for example, stutter instead of moving fluently. This only applies to the Squid though.

Also, I experience a severe FPS drop when it starts raining, but this only troubles me when I have Vsync enabled, however, turing Vsync off isn't an option.

When I have Vsync disabled, my maximum framerate is about 150 FPS, with Vsync enabled, it's limited to 60. When it rains and Vsync is disabled, my framerate varies between 80 to 100 FPS, however, when Vsync is enabled, My framerate drops to 30 FPS.

Finally, the game freezes for a moment when I set something on fire.

Especially the second problem troubles me, as my gameplay is impaired.

I've seen videos of people running Minecraft just fine with 1920 by 1080 resolutions, while I'm only using a 1280 by 1024 resolution, so higher framerates should be achievable.

Does anyone know what could cause these problems?

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    I'm guessing the problem has something to do with movement, since the game lags when moving rain particles are generated, a moving fire is placed or when a squid moves. – Jaïr Paalman May 20 '16 at 21:15
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    I'd suggest you to monitor your CPU's activity while experiencing these lags, such as watching for usage, temperature... Found many posts like yours on the internet, not for minecraft but still, they added fans and it was all good – Pronox Jun 3 '16 at 8:52
  • The CPU does get quite hot. I'll try a 3th party cooler. – Jaïr Paalman Jun 4 '16 at 12:44
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By now, I've found the source of the problem myself. My RAM clock speed was too high, causing the game to become unstable. 2400 MHz is apparently too much for the 7850K. Once I turned the clock speed down to 2133 MHz, Minecraft was stable again. My framerate, however, was still quite low. I could get a maximum of 30 FPS on minimal settings with an 8 chunk render distance, when my much older A8 5500 could reach at least 60 on these settings. I think the temperatures may be the cause of that, but I'm not sure. Anyways, I've bought an R7 360 GPU and now everything works fine. I'm still disappointed, though. I expected a lot more of the 7850K. I guess I should have bought an Athlon X4 860 instead.

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