Radeon HD 4855 vs Radeon HD 7950 Boost

Radeon HD 4855
Memory: 512Mb GDDR5DESKTOP
Release date: 3 Jan 2010
Radeon HD 4855
Radeon HD 7950 Boost
Memory: 3072Mb GDDR5DESKTOP
Release date: 22 Jun 2012
Radeon HD 7950 Boost


Reasons to consider Radeon HD 4855

90 watts lower power draw. This might be a strong point if your current power supply is not enough to handle the Radeon HD 7950 Boost .
Based on an outdated architecture (ATI TeraScale), there are no performance optimizations for current games and applications.

Reasons to consider Radeon HD 7950 Boost

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.

Radeon HD 7950 Boost

HWBench recommends Radeon HD 7950 Boost

Based on theoretical specifications.


Core Configuration

Radeon HD 4855Radeon HD 7950 Boost
GPU NameRV770 (RV770 PRO)vsTahiti (Tahiti PRO2)
Fab Process55 nmvs28 nm
Die Size256 mm²vs352 mm²
Transistors956 millionvs4,313 million
Compute Units8vs28
Core clock575 MHzvs850 MHz

Memory Configuration

Radeon HD 4855Radeon HD 7950 Boost
Memory TypeGDDR5vsGDDR5
Bus Width256 bitvs384 bit
Memory Speed900 MHz
3600 MHz effective
vs1250 MHz
5000 MHz effective
Memory Size512 Mbvs3072 Mb

Additional details

Radeon HD 4855Radeon HD 7950 Boost
TDP110 wattsvs200 watts
Release Date3 Jan 2010vs22 Jun 2012

Raw Performance comparison

Pixel Rate

  • Radeon HD 4855
    9.20 GP/s
  • Radeon HD 7950 Boost
    27.20 GP/s

GigaPixels - higher is better

Texel Rate

  • Radeon HD 4855
    18.40 GT/s
  • Radeon HD 7950 Boost
    95.20 GT/s

GigaTexels - higher is better

Memory bandwidth

  • Radeon HD 4855
    115.00 GB/s
  • Radeon HD 7950 Boost
    240.00 GB/s

GB/s - higher is better

Single precision performance

  • Radeon HD 4855
    736.00 GFLOPs
  • Radeon HD 7950 Boost
    3046.00 GFLOPs

GFLOPs - higher is better