Quantcast
 


AMD Radeon HD 7950 Review; Tahiti Pro Arrives

Author: SKYMTL
Date: January 30, 2012
Product Name: HD 7950 3GB
 
Share |

Increased Geometry Processing & ROP Efficiency



Look familiar? Upon first glance there really isnít all that much different between the geometry processing engines in the current and next generation architectures but there are several optimizations built in for increased efficiency and throughput.

Letís start with the obvious first. Much like Cayman, Tahiti uses two distinct geometry processing engines that are accessed through a common Command Processor which takes care of load balancing and scheduling. The fixed function stages are broken up into the two engines that work in parallel and contain what AMD calls their ďninth generationĒ tessellators. Alongside other small changes, these new tessellation units still feature off-chip buffering which allows geometry data from tessellated workloads to be stored in the DRAM if the on-chip cache becomes saturated. However, due to the large amount of fast L2 cache available in the Tahiti core, tessellation performance has been increased by an order of magnitude over Cayman.


The result of these changes to the tessellation engine is a vast improvement over the HD 6900-series at higher levels of tessellation. Many people may clue into the seemingly lackluster increase at lower levels but we have to remember that the previous architecture already brought a ton of potential to the table in exactly these situations. Once everything is taken into account, Tahiti should offer more balanced performance in DX11 games that demand all levels of geometry processing.


Once again there really doesnít seem to be much in the way of changes to the ROP layout either with partitions of four ROPs and 16 z-stencil units throughout the core. However, AMD makes better use of these ROPs by leveraging Tahitiís increased memory bandwidth for a 50% theoretical fillrate increase over the previous generation.
 
 
 

Latest Reviews in Video Cards
January 27, 2015
There has been plenty of controversy about NVIDIA's GTX 970 and the way the core addresses its associated memory. †In this article we explain the limitations and test whether or not they have a negati...
January 22, 2015
At just $199 NVIDIA's new GTX 960 is looking to provide a perfect combination of performance, efficiency and value for a highly competitive market segment. †Its benchmark numbers are good, but are the...
December 22, 2014
Enthusiasts have been waiting for it and here it is: The ASUS GTX 980 Matrix Platinum in all of its overclocking, gaming glory and the performance on tap is spectacular....