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Radeon HD 4670 1GB vs Radeon HD 6790

Intro

The Radeon HD 4670 1GB has core speeds of 750 MHz on the GPU, and 1100 MHz on the 1024 MB of GDDR4/GDDR3/DDR3/DDR2 memory. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Compare those specs to the Radeon HD 6790, which comes with a clock speed of 840 MHz and a GDDR5 memory speed of 1050 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB 70 Watts
Radeon HD 6790 150 Watts
Difference: 80 Watts (114%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 is 282% faster than the Radeon HD 4670 1GB overall, due to its greater data rate. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4670 1GB 35200 MB/sec
Difference: 99200 (282%)

Texel Rate

The Radeon HD 6790 is much (more or less 40%) more effective at AF than the Radeon HD 4670 1GB. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 4670 1GB 24000 Mtexels/sec
Difference: 9600 (40%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6790 is superior to the Radeon HD 4670 1GB, by a large margin. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon HD 4670 1GB 6000 Mpixels/sec
Difference: 7440 (124%)

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

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Radeon HD 4670 1GB

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

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Model Radeon HD 4670 1GB Radeon HD 6790
Manufacturer AMD AMD
Year Sep 10, 2008 April 2011
Code Name RV730 XT Barts LE
Memory 1024 MB 1024 MB
Core Speed 750 MHz 840 MHz
Memory Speed 2200 MHz 4200 MHz
Power (Max TDP) 70 watts 150 watts
Bandwidth 35200 MB/sec 134400 MB/sec
Texel Rate 24000 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 6000 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 320(64x5) 800
Texture Mapping Units 32 40
Render Output Units 8 16
Bus Type GDDR4/GDDR3/DDR3/DDR2 GDDR5
Bus Width 128-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 514 million 1700 million
Bus PCIe 2.0 x16, AGP 8x 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 megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4670 1GB

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.

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