Q8200 w/ Ati 4830 performs 3 times slower than it should. Why?

Gaming
1

Hello to all. I noticed that my computer slowed down tremendously in the last 6-8 months. It was being able to play Medal Of Honor with a decent framerate that gave me a nice multiplayer experience. I love that game and that's why I'll use it as a benchmark. Let's look at this graph first. 

High_01.png609x781 75.9 KB
 

So a 4850 is around 45fps. A 4830 should be 38-39ish. Maybe more. I remember playing it on 50fps at the map Kunar Base. But recently in the last few months(6-8) my computer slowed down immensely. Now it plays it at 12-15FPS !!! I reinstalled Windows when it happened. No change. Still had that shitty framerate. Assassin's Creed (the first one) runs at 12fps! I remember playing that back in the day with 70fps. I was really frustrated but there really wasn't anything I can do. So I just accepted the situation for what it was. Today I reinstalled Windows again. 5 months after the previous reinstall, I thought, maybe this time will be different. Installed all my drivers, installed the game, set my graphical quality and then BAM - 12 fps again. 

What do you think may be the problem. Is it normal for a PC to slow down so much after 5 years? 

2

I use to use one of these chips years ago they did ok but they didn't do so well OC for some reason. If i can remember correctly two different batches of these had been made one unlocked then later down the line one with a power cap was released you could tell by checking CPU-Z it would have an LS or L something like that i think.

It could be that the heat has gotten to it or something and it's trying to throttle. How are the temps on it?  

3

The temps are perfect. 75 max under load. That's pretty good considering that when I got that PC in 2009, the stock cooler was so bad, that the CPU cores went to 100C.