Computer shuts down randomly – suspected PSU or memory – which one is it

In this case, I would follow some basic troubleshooting guidelines.

Step 1) Determine a reproducible process for testing the issue. You need a set of steps to take that will make the system crash each time you do it. The best process is one where you can walk away and do something else while it is running. the best processes don't require anything more than windows, but that can sometimes be a challenge. You will be doing this process constantly until you determine what it wrong. Before you move on, make sure that you can perform the test on a known working machine. You don't want your test to crash all computers, just the one having problems.

Step 2) Reduce the number of variables down to the smallest set. This is where you start removing hardware until you have a bare bones system. You can start with reducing down to 1 stick of ram, removing extra peripherals, and disconnecting hard drives. This is also a good time to reduce the number of running programs down to the fewest possible.

Step 3) Eliminate the OS/Programs from consideration. Get a known good blank hard drive and reinstall windows onto it. Add the latest manufacture drivers and any software needed to test for your error.

Step 4) Start swapping components with known good ones. This is the most time intensive and difficult step to complete. Find compatible hardware and start changing things out. I'd go in this order:

• Video Card (sometimes good to go with a different chip-set series)
• Memory
• CPU
• Motherboard
• Power supply
• Case

If you can't figure out what is wrong after doing all of the above, then you may just need to trash the whole system and build a new one from scratch. What you currently have should work together as long everything is configured correctly.

Hope this helps

SHORT ANSWER:

Change your PSU to more than 1000 watts. (1200w/1500w)

Explanation:

Even if you didn't mention your PSU Watts, I'm sure your problem is a PSU shortage watt. As you have:

• Intel i7 (around 140w)
• 8x8GBRAM (around 35w)
• EVGA Titan X Hybrid (requires at least 600 Watt)
• D15 cooler system (requires at least 140w)
• 6x additional 120mm fans(around 15w)
• 4x SSDs (around 16w)

Doing the math with adding an additional 250 watts to the results as a safety room for your computer, you would end up needing more than 1000 Watts for the current built.

When you pick the PSU, you have to see how much watts you need from the hardware requirements, and then add between 100 to 300 additional watts (depends on your usage), which will cover any shortage that you may experience in the future from usage or adding new components or overclock. Plus, some external connected devices are also counted in. Any device you connected to the computer that DOES NOT have a dedicated power supplier will use PSU power, which means more watts will be used.

So, again, your computer needs more watts to be consumed, but your PSU couldn't offer them. That's why when you unplugged 2 120mm fans, 2 sticks of RAM and an SSD, the computer went back to normal because you free some watts from being consumed.