Turns out it was the processor. I thought it might be the BIOS, but this motherboard is the same socket as the processor I'm using, and I checked the website. Shouldn't be an issue.
Also looked at the PSU (Corsair RM650) but curious enough, it wouldn't BSOD with the overclocked Pentium G3258
(which used similar amounts of power as a stock i5/i7) that I'd been running for several months.
I ended up returning the used i5-4440 and purchasing a new i5-4590, praying to god that it wasn't my motherboard that was the issue. Just installed it last night and ran 25 rounds of the Intel Burntest at the very high setting. Highest temps with the stock cooler/thermal paste was 75, and I know that I will rarely, if ever, be taxing it to the extent that the burntest does.
It makes me think that the 4440 has a bad core or internal temp problems.
I'm just glad I don't have to break down the whole PC to diagnose the issue, because as clumsy as I am, I'd probably probably break one of the perfectly good components. lol
Depends. Huge difference in CPU technology. I am late to the post but I would have asked you for motherboard model, version of board, and BIOS version. Many times, you will find a BIOS update(s) to support newer CPU technology and possible stability issues. If your curious, you could still provide me with the info and I could check to see if you just wasted time. I would also add, this is a classic example for updating your BIOS. Normally, it is not advisable to update the BIOS unless a specific issue is identified and the BIOS update address's it. I assume the chipset on the motherboard supports the CPU in question. Pretty rare to get a bad CPU.
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Well these CPUs are all part of the same generation. The 4440 is about a year older than the 4590 (2013 vs 2014) but my BIOS version is May 2015.
The used 4440 also did this as well while trying to stress it, which makes me believe the chip itself was failing.
So far the new CPU has been working perfectly fine. With the used processor I would get a BSOD every 5-10 minutes even on idle. Nowadays processors and motherboards have become standardized to the point that you really only have to worry about getting the right manufacturer and socket. Features vary, but it would be rare for a motherboard to not support a CPU with the same socket.
I'm thinking the seller either didn't test it, or it came out of a pre-built corporate computer with OEM/manufacturer-specific parts and was on the brink of failure when it was removed.