Is My Computer Dying?

One thing I notice right off the bat is your specs list out 12 GB of RAM. You might check to see if you're running in dual-channel mode for the RAM, and if not, that may improve performance to the point that dropping to 8 could be worth your while.

I would start my diagnosis of a problem such as you describe by downloading a piece of software called Hardware Monitor, and just getting an overview of the temperatures in your system:

http://www.cpuid.com/softwares/hwmonitor.html

The download link is on the right side of the page there, as either an installer, or a simple .zip file you just unzip and run.

Running HWMonitor while you do some tasks on your machine may reveal that a component in your system is overheating, which will give you a direction to head.

On the other hand, to reach 12 GB of RAM, you are likely running differently sized pairs of modules. Timings on modules, even among the same manufacturer can vary slightly and be incompatible. If you have never set timing of your modules yourself, you could have a bad timing value in the RAM that you're just now noticing. There could be slight component drift from a capacitor feeding the modules, causing the differences in timing to now become problematic, for example, but I'm kinda reaching here. Anyway, to find what timings your RAM modules are supposed to support, you could use another handy, free utility called CPU-Z:

http://www.cpuid.com/softwares/cpu-z.html

In CPU-Z you will find an SPD tab. Click on that and look for the Memory Slot Selection. You can choose each of your RAM slots, and find out what the timings should be for the currently installed module in that slot, under the column matching the speed you are running the memory at. The problem with memory timings is that, you don't get to run all four sticks or even two different pairs at different speeds, which means, you have to have compatible timing on all of your modules, or you can run into problems.

On the Memory tab, you can see the timings you are actually running all of your memory at, and compare it to what your modules are designed for.

Changing those timings is something you will need to do in your computer's BIOS.

don't yet reinstall os. you can do that if all else fails. i suspect disk health/virtual memory related issue

a) How much of your boot drive (I suppose the SSD) and the other drive full
b) Have you tried disk cleanup and other easy stuff
c) have you checked the health of the ssd with the software provided (like samsung magician, etc)

also, just open your box once, push your RAM and other connections a little and dust it if required

reboot and report

For our own edification, can you list out the temps your processor is running at, both when idling and when loaded? It's not that I don't believe you, but we've seen plenty of occasions where the posters didn't realize the temperatures were not fine, and said they were fine anyway. It's easier for us to troubleshoot when we have more data to look at.

By the RAM being all the same speed, do you mean, the SPD readouts match what the Memory tab page lists you to be running it at, or that all of the different modules on the SPD page are rated for the same speed?

I agree with Half Life, I wouldn't do an OS reinstall just yet.

You might try downloading and running a memory diagnostic test overnight, to see if it can pick up any errors. Here are a few common ones:

http://www.memtest86.com/

http://www.memtest.org/

And also the instructions from Microsoft to use their utility built into Windows, if you prefer:

http://windows.microsoft.com/en-us/windows7/diagnosing-memory-problems-on-your-computer

If you decide to open your computer case to make sure things are plugged in, you may want to verify the plug ends on your SATA cables going to your SSD and HDD. Those can fatigue and fail over time and could be causing intermittent contact. I would pull each end and visually inspect it for bowing or expansion in the center. Too much and you'll lose the connection from time to time, which will either disconnect the device from the bus, or could lock up the machine.

Don't defragment an SSD, ever. It runs unnecessary write cycles (which SSD cells have a limited amount of) on the drive for zero benefit. SSDs can access every storage location at the same speed, so defragmenting can yield them zero benefits.

As a happy 6 core AMD user myself, I suspect right away from your numbers, you're processor is on the verge of too hot.

The maximum rated temps for these chips is between 55°C - 62°C, at least according to CPU-World:

http://www.cpu-world.com/CPUs/K10/AMD-Phenom%20II%20X6%201090T%20Black%20Edition%20-%20HDT90ZFBK6DGR%20(HDT90ZFBGRBOX).html

I know from my own experience, when I start to run in the 60°C+ range with my 1090t, it no longer likes to complete such things as Prime95 runs with accuracy, usually throwing an error on one or more cores until the temps drop, due to lower loading.

Your high load temps look reasonably consistent with your high idle temperature, however. Is the ambient temperature (the temperature of the room your computer is operating in) very high, such as in the mid 80's°F (27°C)and above? Are you using the stock cooler? Is the cooler running at 100% fan speed, or being run based on an acoustic target instead? With aftermarket air cooling, my 1090t generally idles in between 10°C - 20°C, and the variance is directly related to the room temperature that the machine operates in. I can only hit the 60°C mark when stressing every core such as with Prime95. Right away I suspect your cooling is insufficient for the processor.

On another note, I would not fret about the 128°C temperature that you were reported by HWMonitor. It's common for the program to list out whatever available monitoring lines it finds in the system, only for those inputs to be unused by the manufacturer of your motherboard or other device. At that temp you'd likely be smelling something.

One thing you might consider would be to increase the processor's heat sink fan speed, and perhaps even leave your computer's side panel off, to see if you can reduce your idle and load temperatures for your processor. If that alleviates your troubles for the most part, I think you're on track to getting things back to normal.

It's not unusual for the processor's heat sink to be clogged with dust after some time of usage. You should carefully inspect to see if perhaps you have an accumulation of dust on the fan blades and in the heat sink fins. This will drastically reduce the efficiency of your cooling, and often leads to lock-ups when you exceed your processor's thermal tolerance. It's not as readily apparent on some Intel chips, as that brand usually down-clocks to alleviate the problem, but that can be just as confusing to the end user. Either way, it's good to keep an eye on the processor cooling.

If you find the heat sink to be clogged, and decide to clean it, or remove and clean it, it would be good to know a few tips, and have a few things handy. If you remove the heat sink, you should find what is known as a TIM or "thermal interface material" between the heat sink base and the top of the processor. This should be cleaned from both surfaces and replaced. If you don't have replacement on hand, you may want to hold off on removing your heat sink. To clean the material off, isopropyl (rubbing alcohol) and q-tips or coffee filters works well. Let the alcohol air dry, which only takes a moment, and then use about a chick-pea sized drop of thermal compound in the very center of the processor's heat spreader, when remounting the cooler.

When cleaning the fan blades or heat sink fins, if you use any form of compressed air to dislodge the built up accumulation, make sure you do not allow the fan to spin freely. Hold the blades in place with a pencil or q-tip, or even your finger, so they do not spin excessively fast. The bearings for the small fans are not designed to handle the high RPMs that compressed air will drive them at, and can end up ruined or at least, very noisy.

here is my suggestion:

your ssd has about 6% free space. that is i think too low

can you move about 60 gb from your ssd to your secondary hard drive? it can be user data or media files

i think this will help you greatly even if it does not solve your problem