47C and 77C are pretty hot for what amounts to a CPU in idle and a GPU in 2D. There are three ways this is likely to happen:
1. You really do have an air circulation problem. This isn't real common unless you skimped on the fans or somebody who built it for you did. The old Dell Dimension 4700 was notorious for this. The manufacturer mounted the fan so that it did a good job of keeping hot air inside the case.
2. The CPU and GPU have inadequate coolers. The most likely problem combination is a 125W AMD CPU on stock cooling.
3. The computer is set up for low noise. Low-noise setups may not crank up the fans until the CPU hits 50C or the GPU hits 80C or the power supply hits 50% load.
Before messing with fans, check these points:
1. Are you running an inadequate CPU cooler? High-power AMD CPUs or any overclocked CPU on stock cooling are the most likely candidates.
2. Are you running with low-noise fan settings? There should be BIOS or UEFI settings for CPU and case fans. Adjust these in the direction of more noise, more fan.
3. Run with the side panel off; run with the side panel off and a portable fan blowing air at the open side. (Do this in a dust-free place.)
I make fan setups with two objectives in mind:
1. Most important, pull hot air away from components that generate it. If you have a GPU that exhausts into the case, put an exhaust fan in the side panel over the GPU. Put one or two exhaust fans near the CPU cooler.
2. Sometimes you need to feed cool air to a component that needs it. I have one high-power AMD setup where I put an intake fan on one side of the CPU cooler and two exhaust fans on the other. I have a mean old nVidia GPU (reference cooler, so it exhausts to the outside) where I put an intake fan on the side panel.
I don't set store by positive/negative pressure arguments. You can't achieve any significant pressure gradients with consumer-grade cases and fans. And it's less important than "get the hot air out".
Since the components seem to be relatively old to me it might simply be dust? I'm cleaning up my PC twice a year and it's pretty impressive how much dust can be accumulated in that time (and that's with dust filters on all chassis fans). And I don't know specifically about the FX6100 but a lot of AMD CPUs tend to run very hot, compared with the current Intel gen. Although the GPU seems to be more of an issue - 80°C is pretty high, my GPU never goes above ~65°C at full load.
First try your new GPU in some games and then take a look on benchmarks with your 270x and if you will have less FPS than another gamers with your GPU, then overclock.Does it generate significant more heat if overclocked?
I have a Thermal T. lanbox(less airflow) and the average temperature when gaming is 55-58C.
Wicther 3 uses a new engine Red Engine 3 not same as Red Engine 2
Phenom II 9's and 10's are good. (So are unlocked 5's if you got one.) The more recent FX-8's have better memory handling, but the old ones are just as good at crunching numbers. They run hot, and they run hotter if you overclock them, so yeah, given that you already have heat issues that you may not be able to solve in a lanbox, overclocking may not be an option.
There's an excellent old discussion of overclocking Phenom II's at http://www.overclock.net/t/525113/phenom-ii-overclocking-guide