The  most important question in the gaming world is; which has better graphics? However, it is very difficult to answer. We are saying difficult because if you compare graphics of the current Xbox 360 with the PS3, it will vary from game-to-game, and generally the difference is not that great. It's all down to the way games are made.

The Xbox One processor will be based on Jaguar architecture from AMD. It will use an APU with eight x86-64 cores clocked at 1.75 GHz that comes with 8 GB of DDR3 RAM with a memory bandwidth of 68.3 GB/s. However, according to some reports, 3 GB of RAM will be reserved for the operating system and apps for games.
The memory subsystem will also come with an additional 32 MB of "embedded static" RAM, or eSRAM, with a memory bandwidth of 102 GB/s,The console has a a Blu-ray Disc optical drive and a 500 GB non-replaceable hard drive.The graphics processing unit (GPU) will run on AMD GCN. It will have a total of 768 cores running at 853 MHz providing an estimated peak theoretical power of 1.31 TFLOPS.The gaming console will feature Wi-Fi Direct, Gigabit Ethernet and 802.11n wireless for networking.The Xbox One will support 4K resolution (3840×2160) (2160p) video output and 7.1 surround sound. The Xbox One will have an HDMI 1.4 for both input and output, however, it won't support composite or component video.
playStation 4 Hardware
The heart of both the console is similar. Both have a processor developed by AMD. The PlayStation 4 will also use an AMD processor. The PS4's CPU consists of eight x86-64 cores packed with 8 GB of GDDR5 memory which will give the console considerable longevity.The system can run at a maximum clock speed of 2.75 GHz. The PS4 will also come with a secondary custom chips. This chip basically performs tasks associated with downloading, uploading, and social gameplay.
The PS4 will support photos and videos at 4K resolution, but it is not expected to be able to render games beyond 1080p. The console will have a 500 GB hard drive for additional storage, which can be upgraded by the user.For networking, the PlayStation 4 will support Bluetooth, 2USB 3.0 ports https://games.yahoo.com and WiFi. Users will be able to include an auxiliary port for connection to the PS4's Camera,A mono headset, which can be plugged into the DualShock 4, will come bundled with the system.
Who is more powerful?
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The simple answer is the PS4. Look into the technical reasons mentioned above, it is clear that the PS4 is more powerful.Do you [games] the news that the Sony PS4 is (almost) categorically more powerful than the Xbox One is one of the reasons why the PS4 pre-order sold out before the Xbox One's?
However, it's worth noting that it's likely there will only be minor differences in titles released for both consoles. There's little benefit for a developer in making one version a good deal prettier than the other.
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