On the airflow issue... Fluid dynamics is often one of those things that will make any engineer groan if you mention it, because it's a very difficult subject to get your head around. Simply having a bunch of fans doesn't mean anything if all that air is getting bunched up into pockets inside the case somewhere, which seems to be the case if your video card is now running hotter than before.
I've seen people make all kinds of mistakes with air flow. I've seen people who think having 20 fans (maybe a slight exaggeration) will somehow compensate for the rats nest of cables they have strewn about everywhere. Or people who have all exhaust fans and no intake fans, or maybe only 1 intake fan and 4-5 exhaust fans. I've seen people who put the intake fans on top and exhaust fans on the bottom or pair an intake with an exhaust on the side of a case. The number and/or power of the fans doesn't mean much if you can expel the hot air and replace it with cooler air. What you want is something like a river. If you imagine the air as a stream, you want the cooler air that settles at the bottom to be pulled in by an intake fan and blown up past the CPU and GPU on its way out the top of the case. Basic thermodynamics tells us that convection cooling only works if the air blowing past the device is at a lower temperature. So some of the heat energy is transferred to the air flowing past and the device generating the heat is cooled.
Now, if you use the stream analogy and think of a tree branch or something that might have fallen into the river and made something of a makeshift dam, the water starts to back up and swirl around that branch as it seeks to move down stream. Think of all the cables in your computer as tree branches fallen into a stream. If they're all off to the side, running parallel with the shore, the impact is minimal, but if they're jutting out, you've got a problem.
This is all just the cruising altitude overview of the subject. Many elements have been glossed over or overly simplified. But the fact that your video card is now running warmer after putting in a more powerful CPU fan says that you've got some blockages in your air flow causing hot air pockets to build up which could very well explain your problem.
I have recently been having a problem with my computer where my mouse and keyboard begin to lag when I am playing a game. Now at first I just thought it was the game lagging but as I looked at it further everything inside the game wasn't lagging at all. This problem began happening when I replaced my stock CPU fan with a Cooler Master fan. Ever since then my graphics card has been running 10 degrees Celsius hotter and (52 before to 62 after). I have made sure that the airflow inside the computer is still good, and really the new fan should only help with flow. I was wondering if there is any way to fix this issue and if the new fan could have caused the problem?
- Windows 7 64 bit
- ASrock Z77 Pro 4 mother board
- Intel i5 - 3570 chipset, 3.4ghz
- MSI Nvidia gtx 760 graphics card
- 500 W powersupply
- 16 GB memory
- 1 TB hard drive