Radeon HD 6870 X2 vs Radeon HD 7990

Radeon HD 6870 X2
Memory: 1024Mb GDDR5DESKTOP
Release date: 8 Jul 2011
Radeon HD 6870 X2
Radeon HD 7990
Memory: 3072Mb GDDR5DESKTOP
Release date: 24 Apr 2013
Radeon HD 7990

Summary

Reasons to consider Radeon HD 6870 X2

75 watts lower power draw. This might be a strong point if your current power supply is not enough to handle the Radeon HD 7990 .
Based on an outdated architecture (ATI TeraScale), there are no performance optimizations for current games and applications

Reasons to consider Radeon HD 7990

This is a much newer product, it might have better long term support.
Higher theoretical gaming performance, based on specifications.
Supports Direct3D 12 Async Compute
Supports ReLive (allows game streaming/recording with minimum performance penalty)
Supports Mantle
Based on an outdated architecture (AMD GCN), there may be no performance optimizations for current games and applications

Radeon HD 7990

HWBench recommends Radeon HD 7990

Based on theoretical specifications.


Specifications

Core Configuration

Radeon HD 6870 X2Radeon HD 7990
GPU NameBarts (Barts XT)vsMalta ()
Fab Process40 nmvs28 nm
Die Size255 mm²vs365 mm²
Transistors1,700 millionvs4,313 million
Shaders1120vs2048
Compute Units14vs32
Core clock900 MHzvs950 MHz
ROPs32vs32
TMUs56vs128

Memory Configuration

Radeon HD 6870 X2Radeon HD 7990
Memory TypeGDDR5vsGDDR5
Bus Width256 bit x2vs384 bit x2
Memory Speed1050 MHz
4200 MHz effective
vs1500 MHz
6000 MHz effective
Memory Size1024 Mbvs3072 Mb

Additional details

Radeon HD 6870 X2Radeon HD 7990
TDP300 wattsvs375 watts
Release Date8 Jul 2011vs24 Apr 2013

Raw Performance comparison

Pixel Rate

  • Radeon HD 6870 X2
    57.60 GP/s
  • Radeon HD 7990
    60.80 GP/s

GigaPixels - higher is better

Texel Rate

  • Radeon HD 6870 X2
    100.80 GT/s
  • Radeon HD 7990
    244.00 GT/s

GigaTexels - higher is better

Memory bandwidth

  • Radeon HD 6870 X2
    268.00 GB/s
  • Radeon HD 7990
    576.00 GB/s

GB/s - higher is better

Single precision performance

  • Radeon HD 6870 X2
    4032.00 GFLOPs
  • Radeon HD 7990
    7782.00 GFLOPs

GFLOPs - higher is better