That's impossible, you can't mine and play video game on the PC at the same time, it will surely reduce it's hashrate or even stop mining and hang your system, I don't believe this, I can go with youtube video and browsing but not gaming, even watching YouTube video while mining will slow down your hashrate
Try running mining on a video card and the game "Heroes 3". Hashrate will not drop. Of course, if you run games like Call of Duty: Modern Warfare,
you won't be able to mine and play at the same time. Friends miners play on farms in EVE Online. Perhaps FP91G was talking about such games.
The most important thing is to have a powerful processor and 8 GB of RAM. It's bad to play on a 2-core processor.
Might be true, who knows? But I've never had any luck trying to run games while mining without hanging and freezing the whole PC, sometimes I might have to reboot the PC, even with low games indie games the PC will still reboots, I'm not saying you are wrong but I have enough CPU power, 8cores