New Chinese GPU as fast as Nvidia GTX 1080 is allegedly being developed

When we think of gaming graphics cards, it’s either AMD Radeon or Nvidia GeForce that comes to our mind. This might not be the case for long as a Chinese GPU company by the name Changsha Jingjia Microelectronics is allegedly building a GTX 1080-level graphics chip dubbed JM9271.

Can the JM9271 GPU really be as Fast as the GTX 1080?

The company currently produces a lower end 28nm based JM7200 which provides Radeon R7 240/GT 640 level of performance at a TDP of 10-40W. The R7 240 is also a 28nm GPU and operates within a TDP of 30W.

	AMD Radeon R7 240	Jingjia JM7200
Process	28nm	28nm
Core Clock	up to 780 MHz	up to 1300 MHz
Memory Capacity	up to 2GB	up to 4GB
Memory Clock	900 MHz	1066 MHz
Memory Bus	128 bit	64 bit
Memory Bandwidth	28.8 GB/s	17.06 GB/s
TDP	30 W	10-40 W

As we can see, the specs of the 2 cards are quite similar barring a couple of exceptions.
The JM7200 has about half the memory bandwidth but its core is clocked nearly twice as high so things should even out. This implies that the IPC of these 2 GPU architectures should be remarkably comparable.

The fastest 28nm AMD graphics card Radeon R9 Fury X is around 11x faster than R7 240 according to TechpowerUp. But it’s still around 50% slower than the GTX 1080. If we add up, the GTX 1080 should be 12x faster than the R7 240 which certainly appears to be the case.

	JM7200	JM9271
API	OpenGL 1.5	OpenGL 4.5
Process	28nm	28nm
Core Clock	up to 1300 MHz	>1733 MHz
Memory Capacity & Type	up to 4GB GDDR3	16GB HBM2
Memory Bandwidth	17.06 GB/s	512 GB/s
TDP	10-40W	200W

Since we do not have the number of stream processors (SPs) of the either GPUs, we have to guesstimate it by looking at the TDP. The JM7200 operates between 10-40W. If we assume the average TDP of the JM7200 as 25W, then the larger JM9271 should have around 8 times the SPs or basically 8 times faster.

Also given the fact that the JM9271 has at its disposal 30 times the Memory bandwidth of the JM7200 and it should hardly come as a surprise that the 9271 may indeed perform at the same level of GTX 1080 despite still being on 28nm.

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