I get commissions for purchases made through links on this page. (more info)

Compare any two graphics cards:
VS

Radeon HD 4870 2GB vs Radeon HD 6790

Intro

The Radeon HD 4870 2GB features a GPU clock speed of 750 MHz, and the 2048 MB of GDDR5 memory runs at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 6790, which features core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

In theory, the Radeon HD 6790 is 17% quicker than the Radeon HD 4870 2GB in general, because of its greater bandwidth. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 19200 (17%)

Texel Rate

The Radeon HD 6790 will be just a bit (more or less 12%) faster with regards to anisotropic filtering than the Radeon HD 4870 2GB. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 3600 (12%)

Pixel Rate

The Radeon HD 6790 will be just a bit (about 12%) better at AA than the Radeon HD 4870 2GB, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 1440 (12%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Display Prices

Hide Prices

Radeon HD 4870 2GB

Amazon.com

Check prices at:

Radeon HD 6790

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

Display Specifications

Hide Specifications

Model Radeon HD 4870 2GB Radeon HD 6790
Manufacturer AMD AMD
Year Jun 25, 2008 April 2011
Code Name RV770 XT Barts LE
Memory 2048 MB 1024 MB
Core Speed 750 MHz 840 MHz
Memory Speed 3600 MHz 4200 MHz
Power (Max TDP) 150 watts 150 watts
Bandwidth 115200 MB/sec 134400 MB/sec
Texel Rate 30000 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 800(160x5) 800
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 2GB

Amazon.com

Check prices at:

Radeon HD 6790

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Comments

Be the first to leave a comment!

Your email address will not be published. Required fields are marked *


*

WordPress Anti Spam by WP-SpamShield