A Chinese website has published pictures and details of the Nvidia GeForce GTX 880 GPU which is said to be based on the Maxwell architecture.
While the previous rumors suggested that the Nvidia GeForce GTX 880 will carry GM204 GPU, it comes with a GM210 GPU.
The source says that it is an engineering sample so we do not know if this is how the final production unit will look like.
The GPU is slightly smaller than GK110 and bigger than the GK104.
GeForce GTX 880 Specifications
3200 CUDA cores (not be the most powerful Maxwell GPU)
16 SKHynix H5GQ4H24MFR 0.5GB memory modules (8 on top and 8 on back)
8 GB memory @ 7GHz
Bandwidth of 224 GB/s (same as GTX 770)
Expected release date is sometime in second quarter of 2015.