Inefficient PSUs waste power so try to get an 80+ Silver or Gold rated unit. If you have to make a choice its better to cheap out on something else and get a good PSU.
Heatsinks are just getting weirder.
This new one from Prolimatech, looks like they had a factory accident on the Megahalems line. Or if you stepped on the side of a D14.
I think they mostly all unlock if they are on reference boards. TPU did a count of cards that unlock successfully and it was rare find one that wouldn't unlock. I personally lean towards Nvidia when the performance is close between two competing cards, I like Nvidia's features and their driver...
If you don't have any other available slots to space the cards out then there isn't much you can do. If your case has front intake fans try to position hard drives out of the way so the most of the airflow goes straight to the GPU. A bottom fan mount blowing up would also help cycle the ambient...
Virtualdub and its variants also have an audio skew function. Could check out Avidemux.
If you're not particular to VLC, I'd go with Media Player Classic as an alternative player.
I've seen some people use a 120mm fan with Megahalems fan clips and place it higher up on the heatsink to clear tall RAM. Even with only one fan mounted the Silver Arrow/NH-D14 are still huge heatsinks, should cool well enough. Good case airflow will always help.
Yeah, anything that uses Linpack will stress your OC the most and show if its stable pretty fast. It will also give you hotter temps than Prime.
If you're using the IBT Linpack frontend, and it isn't pegging all your cores in Windows Taskmanager, make sure Threads are set to 8 if HT on or 4 if...
For now I'd definitely back up any important files at least to a thumbdrive or DVD/CD, could also rar them into passworded 50MB multipart files and upload to Skydrive. If you call WD and explain the noise problem they'll probably issue the RMA, though I've had them ask for the error code from...