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|
|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.
|API||OpenGL 1.5||OpenGL 4.5|
|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|
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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