I recently bought and put together this hardware:
2x4GB GSkill DDR3
with this reused old hardware including:
PCI-Express x1 Wireless card
Modular PSU(need to check the wattage, but more on this later)
1 OCZ Vertex 3
1xDVDRW Combo drive
I got everything set up, installed Win7 and besides some wireless issues(nothing computer specific just where the unit was placed to get a signal wasnt ideal) everything seemed fine. I played some diablo 3 and some batman Arkham Origins and both played fine. Now i am finding that the computer freezes. But it only seems to freeze when I am accessing one of the seondary mechanical drives. The drives were working fine when they were in the old build and they can run for a long time without issue as i was downloading multiple torrents at one point and not crashing. However, when i get into playing a video from this drive though, thats where it *might* freeze up. With the sound sometimes continuing for a few seconds, sometimes distorting into noise, sometimes looping back on the last few seconds. This doesnt always happen and i have skimmed through several videos without it happening.
I reseated and replaced some sata cables, and for a while i thought that did it and then it happened again, while playing a video. I have been trying to identify what could be the issue. If i never access the other drives, it seems like the problem never happens. Even if i am playing games for a few hours(which one would think is more strenuous then powering up a HDD). So it could be the drive, but i never had any issues with this drive before and as mentioned, torrents were downloading simultaneously wihtout any probelm. Then i was wondering if it could be power. Like i said, i need to check the wattage, but if memory serves, i thought it was around 500Watts. I was debating on taking out the 5750 and using the onboard video just to see if the subsequent power usage drop would affect it. I don't think heat is an issue as it is pretty cool and for this testing i made sure to increase the airflow just in case.
AMD drivers for the 5750 are up to date.