[vernie]

Most desktop computers aren't in space.

[falcolas]

That same wiki article references Google's experienced numbers, with a high end of "about 5 single bit errors in 8 Gigabytes of RAM per hour"

[monocasa]

Google at the time was buying memory chips that had failed manufacturer QA, stuffing them on to DIMMs themselves, and then running whatever seemed to pass.

[ascagnel_]

That number was consistent on-the-ground pre-launch and post-launch (with the exception of a short period of higher error instances due to a solar flare).