Sony disabled
Other OS in the 3.21 firmware updateI would advise against buying a PS4 until Sony restores that function as a sign of good faith.
The PS3 would probably fare no better than a GPU mining. If you want to mine, you essentially need to invest in ASICs. If Sony still had other OS, you could probably use it to control the actual hashing machines. The 256MB of RAM would be limiting though. (For using P2Pool you essentially need 2GB to run P2Pool and Bitcoind at the same time).
That link is 4 years old and can be ignored. You can customize your firmware with
https://github.com/aldostools/webMAN-MODThere are a few important points to remember:
1. It'll get super hot and
will destroy your ps3 in a short time by desoldering pretty much everything attached to the motherboard.
2. Costs 100x more in electricity than it makes in mining profit per day.
3. A Pain in the ass to set up if you can find the software mod files without malware.
4. Totally worth it for bragging rights.Those bragging rights passed away a long time ago. In a head to head between somebody running 50 Neptunes with Novec 7100 or a PS3 mining Bitcoin - I would be more interested in the Novec setup. As noted above it's been done on a SNES and nobody even remembers him.