Radeon Retrospective: Radeon HD 7870 GHz Edition and RX 480 [Video]

Keith May

Over a year ago we did a GeForce then and now article and video.  In there we promised a Radeon Retrospective as well.  Yes, over a year ago, I know. We had several different ideas and all of them fell through for some reason or another until now.  Having secured a reference design Radeon HD 7870 GHz Edition we now had a GCN 1.0 Mid Range Graphics Card on hand to compare to Radeons current mainstream card, the GCN 4.0 based RX 480.  I know that the RX 580 is now but we all can agree that it's a refreshed RX 480 so what we're looking at here is non refreshed original iterations of both Radeon's first 28nm GPU and their 14nm GPU.

HD 7870 GHz and RX 480

 HD 7870 GHz EditionRX 480 8GB
GPU Name
ArchitectureGCN 1.0GCN 4.0
Process Size28nm14nm
Die Size212mm²232mm²
GPU Clock1000MHz1120MHz/1266MHz boost
Memory Clock1200MHz/4800MHz Effective2000MHz/8000MHz Effective
Memory Size2048 MB8192 MB
Memory TypeGDDR5GDDR5
Memory Bus256 bit256 bit
Stream Processors12802304
Compute Units2036
Floating Point Performace2.56 TFLOPS5.83 TFLOPS
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