Okay, i've had this problem for around a year now. I never used to game much on my PC as I had a Xbox 360, I make gaming videos on YouTube and my card used to work fine. About a year back I had an issue on my Radeon HD 6850 with any game I play. I assumed it was a problem with the hardware in the card because it was just out of warranty, I didn't use it much so I left it for a year. About 2-3 weeks ago my new Sapphire HD 7970 Ghz edition arrived, I also sold my Xbox 360 thinking I would switch to PC gaming.
Anyway, the problem persisted, the problem in its best way of describing it, is I can be doing anything in a game, running through a huge battle in Crysis 3, or staring at a wall on ArmA and my frame rate will go from 70+ down to anything from 5-15 fps.
Obviously I can now rule out my 7970 as it is brand new, I can also rule out my HDD (formatted yesterday along with a clean install of windows), it is NOT a driver issue, as it is a continuation of a problem I've had for around a years worth of drivers. It is NOT my system overheating as everything is running at around 30 degrees. My GPU raises to 50-55 degrees when under load. My processor which is clocked at 3.3Ghz goes to around 40 degrees under 100% load.
(Everything run's nice and cool because of my NZXT Phantom Case
)
So, what is the issue? My friend reported to me that my voice whilst on skype wen't 'stuttery' or 'laggy' whilst I was experiencing a lag spike.My microphone is plugged directly into my motherboard through USB 2.0 which has lead me to believe that because my motherboard didn't quite reach the screw-holes in my case so we had to bend it a little (bad I know and it wasn't anything major, more just putting pressure on it so it would fit) but could this have affected my system just a minimal amount in such a way that it could possibly cause the intermittent, absolutely random FPS drops?
My system is 64bit if anyone was wondering and I have 12gb of DDR3 RAM installed clocked at 1333mhz. My processor is the AMD Phenom II X6 1100T Black Edition. I think that is all the information you need
if any of you know a tool where I can simply paste my specs in it would be easier but I think it's all there, if not then let me know 
Any help?!?!
My main question is, could the motherboard be causing this? if yes, it's on its way out!
Anyway, the problem persisted, the problem in its best way of describing it, is I can be doing anything in a game, running through a huge battle in Crysis 3, or staring at a wall on ArmA and my frame rate will go from 70+ down to anything from 5-15 fps.
Obviously I can now rule out my 7970 as it is brand new, I can also rule out my HDD (formatted yesterday along with a clean install of windows), it is NOT a driver issue, as it is a continuation of a problem I've had for around a years worth of drivers. It is NOT my system overheating as everything is running at around 30 degrees. My GPU raises to 50-55 degrees when under load. My processor which is clocked at 3.3Ghz goes to around 40 degrees under 100% load.
(Everything run's nice and cool because of my NZXT Phantom Case

So, what is the issue? My friend reported to me that my voice whilst on skype wen't 'stuttery' or 'laggy' whilst I was experiencing a lag spike.My microphone is plugged directly into my motherboard through USB 2.0 which has lead me to believe that because my motherboard didn't quite reach the screw-holes in my case so we had to bend it a little (bad I know and it wasn't anything major, more just putting pressure on it so it would fit) but could this have affected my system just a minimal amount in such a way that it could possibly cause the intermittent, absolutely random FPS drops?
My system is 64bit if anyone was wondering and I have 12gb of DDR3 RAM installed clocked at 1333mhz. My processor is the AMD Phenom II X6 1100T Black Edition. I think that is all the information you need


Any help?!?!
My main question is, could the motherboard be causing this? if yes, it's on its way out!