Dropping frames in game during day when warm but not at night?

[YardyHardy]

I cleaned my computer out a couple weeks ago and in the process i took the heat sink off. I reapplied thermal paste (at least 3 times now) and although with doing so more than once i'm not sure if it's good. I play a game called Smite which when im playing during the day the frame rate drops to as low as 20fps, this is only during the day. Whenever i play later at night and it isn't warm outside and my room is a lot cooler my game runs fine. I have a temperature check and I have only seen it at the max of 43C. I have a AMD FX-4100 Quad-Core Processor and 7.75GB of RAM. Is there something that could be doing this, or is it still just the heatsink in which should i reapply thermal paste again?

[Geek-9pm]

Tell about the GPU, graphics processor, that you have on the video.
Can you measure its temperature?

[YardyHardy]

I attached my GPU details. How do i measure the temperature of it?

[attachment deleted by admin to conserve space]

[DaveLembke]

Speedfan has a good GPU monitor feature for looking at GPU temps, and plotting it, so that you can start the temp log plotter graph, and then start a game and run that, and then end out of the game or minimize out of the game and look at the last like 10 minutes of temp data for the GPU. You can also log CPU, HDD, and other parts of computer temps that are available if you like with speedfan.

http://www.almico.com/sfdownload.php

[patio]

Play at night...

[patio]

Your also not taking into account Network traffic at certain times...