Switched GPU to Radeon 5770, worked fine at first but lags now.

[stewie-Y]

Hey guys.

About 2 weeks ago my friend gave me his Radeon 5770 card that was working great but he had upgraded, and I swapped it out for my old Geforce 9600gt. I installed all the drivers for the Radeon 5770 and for the first while it worked fine. But now, it's giving me significant graphics lag(like 5fps on Tera) and even CoD 4 is even lagging.

Can anyone tell me why this could be?

[Calum]

Download and run HWMonitor to check your temperatures, it's possible your graphics card or another component is overheating.  Post a screenshot of HWMonitor after gaming for a little while and experiencing this issue so we cans ee what your temperatures are like.

[stewie-Y]

Here's it screenshot while I was running Tera. As you can see it hadn't overheated(only 63 C), but in the dungeon I ran I got from 2-8fps the whole time.

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[Calum]

Your CPU is massively overheating.  I suspect you have possibly knocked the heatsink loose while installing the card.  Your system is throttling down to save the CPU from being damaged.
You'll need to check the heatsink and reinstall it.

[stewie-Y]

I reset the heatsink with new thermal compound and it is working much much better. Thanks!

[Calum]

No problem, glad to hear you got it sorted