If you are interested in reliability of the results you produce, read on.
If you want trustworthy calculations or documents without occasional random mistakes in content, you need a machine with ECC. See http://www.intel.com/content/dam/www/public/us/en/documents/technology-briefs/workstation-ecc-memory-brief.pdf
Soon to be available:
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Nowadays, with very few exceptions, desktop PC's, laptops, notepads, phones and even low end servers all come with RAM that does not check for soft errors at runtime, and usually not even hard errors at power-on or reboot. No parity checking, no Error Correcting Coding (ECC). Most user-class processors, chipsets, motherboards, and BIOS's do not support it.
On these computers, if a random change happens to a bit of code, if you are fortunate, the program crashes. If a random change happens to bits of the kernel, if you are fortunate, the whole OS crashes. If it happens to your application data, well, it isn't what it used to be. Random alterations to a dirty disk buffer in memory will get written out to disk. If it happened to your data, it changed. If it happened to a directory or file system allocation bit map, some spot that is occupied will maybe appear to be free. If it happened to the table of which dirty disk blocks are where in memory, then data blocks on disk will end up with totally content, with the correct content written someplace else or not at all..
Why is it this way? The story goes back 25 years, when clone makers came out with IBM PC clones without parity memory. IBM's and some other company's PC's had parity memory. The good news was that it would catch soft errors. The bad news was that when BIOS caught a parity error interrupt, it cleared the screen, put a Parity Error message on the first line and halted the computer. Unsaved work? too bad. In the middle of a file write, directory or FAT file system update? too bad. Some manufacturers offered a BIOS option to disable that behavior. Enough customers preferred that option that more companies started using non-parity memory. After all, the parity memory bits add another 12.5% to memory cost. Why not be able to offer a lower price for what the customers want? Eventually, even "market driven" IBM started doing the same.
ECC watches for and corrects soft errors when they happen.
For some people, it may be adequate to use a generic laptop to VNC or RDP into a server class machine with ECC for important work.