Noise from CPU while playing games

Hello everyone, I recently facing problem with my CPU I think. When I start to play a game (Elder Scroll V: Skyrim) , my CPU suddenly became so noisy. I don't know if the game will crash or what will happen to it, so I just close the game and everything back to normal. No noise from the CPU anymore.

When I'm listening music, running other program or anything, my CPU doesn't have this annoying noise, but when I'm playing, the noise started.

I'm using Windows 7 Professional, a i5-2500 processor, a NVIDIA GeForce 9500GT and Realtek Audio (From the motherboard I think, because I didn't add any sound card?)

Any help would be appreciate

I would guess it is the fan on the Video card. Some speed up when needed(when playing games usually, or something graphic intense, to keep the card cool enough.).
I suppose it's a possibility that it is the CPU fan, but usually if it's loud enough to hear that well, it's the fan(s) on the video card.

Oh, so because of the old video card, it cannot keep up with the graphic, so it make noise?

Easiest way to tell is to open up your case and start a game, then you can tell what's making the noise.

if the noise starts instantly when the game starts its not going to be your CPU fan as its not going to get hot enough, and most fans will spin at 100% when plugged into the mobo anyway so it would always be audible.

If it is your card it could just be just, so a good clean may help

Sent from my BlackBerry 9900 using Tapatalk

I see...
Well, one weird thing is, the first try, I remove my case, then the whole computer restart. So I leave the case open, and then after the restart is done, I run the game, no noise. Second try, I close the case, the computer restart again. And I run the game again with the case closed. Noise produced again. Third try, restart the computer, start the game without removing the case, noise started to produce, but after a little while, the noise disappear....
What is wrong with it?

Lol side panel rattle!?!

Lol I read it as a short at first, but not sure if he means he restarted it lol

I don't restart myself... the PC restart itself. Well, I not sure what is the problem, I think everything is okay. I check everything and nothing is loose....