Hi Denim, you should really monitor the temp with something like MSI Afterburner, it is a free download. You can watch the temp go up and down as you load the GPU and/or unload it in real time.
Depending on the way your case is, sometimes a side fan actively blowing air in works even better than the side open...it just depends. Sounds like you're doing good though. Might try some collatz on there too, it will most likely run cooler than PG.
