While both consoles make use of an eight-core AMD Jaguar processor, the PS4 features 1,152 GPU cores compared to the XB1’s 768 graphics cores. Sony’s new console drives 1.84 TFLOPS as a result, compared to the XB1's peak shader throughput of 1.23 TFLOPS.
The PS4 also has the edge when it comes to system memory, featuring 8GB of 5500MHz GDDR5 memory compared to the XB1’s 8GB of 2133MHz DDR3 RAM. The PS4 has a rumoured 512MB-1GB reserved for it's OS, while we know the XB1 has 3GB reserved for it's 3 OS'.
Embedded memory and embedded memory bandwidth for the PlayStation 4 are still unknown factors.
But what else do we know? Aside from specs, a lot of "features" have been revealed, so let's recap those.
XB1
- 3GB RAM reserved for OS, 5GB available for games
- 2 CPU cores reserved for OS, 6 available for games
- 10% of GPU reserved for OS, 90% available for games
- Change channels and watch TV through the console (through pre-arranged partnerships, none confirmed as of yet)
- Blu-ray/DVD optical drive
- "Snap" mode allows for seamless transition between games, movies, TV, etc.
- Kinect 2 mandatory for console to operate
- Mandatory installs for all software (requires console to be online)
- Software tied to LIVE ID
- No Backwards Compatibility
- HDMI in/out only
- 4K TV compatible
- Smartglass second screen
- Cross-game video and audio chat via Skype app
- Exclusive launch lineup of Forza 5
- 3rd party launch lineup of Watch Dogs, Assassin's Creed 4: Black Flag, Call of Duty: Ghosts
- LIVE will continue to exist as it did this gen, with all online multiplayer and entertainment features behind a paywall (pricing not yet announced)
- Games can be suspended and resumed, even after turning off console
- System has constant access to the "Cloud", which could be theoretically used to offload AI routines and the like to take load off of the CPU
- Controller now features force feedback triggers (awesome), internal AA batteries, improved d-pad, Start + Select renamed to Menu and View
- Headset not included, and not compatible with previous gen headsets
- Achievement system carries over from 360
- Releasing in North America in 2013
- Region-locked
PS4
- Separate chip for Encoding/Decoding and various other tasks
- Blu-ray/DVD optical drive
- Will not play CDs
- There is a dedicated Share button on the controller. You can send snippets of recorded video straight to a friend and even invite them to watch your game, or allow them to take over your gameplay if you want them to.
- Backwards Compatibility through on-board Gaikai streaming (likely subscription-based, not likely available at launch)
- All PS4 software remote playable on PS VITA through Gaikai streaming (voodoo magic)
- Sharing and social functions controllable via iPad
- HDMI, RCA and Optical outputs
- 4K TV compatible
- VITA second screen
- Cross-game video, text and audio chat via OS
- Exclusive launch lineup of inFAMOUS: Second Son, Killzone: Shadow Fall, Drive Club and Knack
- 3rd party launch lineup of Watch Dogs, Assassin's Creed 4: Black Flag, Call of Duty: Ghosts
- Games can be suspended and resumed, even after turning off console
- Dual Shock 4 features much beefier size, tighter analog sticks, proper R2 triggers, and multi-touch touchpad, internal speaker and a light bar for motion control and identifying players
- Compatible with previous gen peripherals including headsets, keyboards and PS Move (not compatible with Dual Shock 3)
- Trophy system carries over from PS3
- Headset included
- Releasing in North America and Europe in 2013
As far as I know, that's everything we know up to now. Did I miss anything? If I made any errors, let me know and I'll edit. I haven't been following it as closely as many here, so there may be updated info I wasn't aware of.