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Radeon HD 4670 1GB vs Radeon HD 6790

Intro

The Radeon HD 4670 1GB uses a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 RAM works at a frequency of 1100 MHz on this card. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Compare that to the Radeon HD 6790, which has GPU clock speed of 840 MHz, and 1024 MB of GDDR5 RAM set to run at 1050 MHz through a 256-bit bus. It also is made up of 800 Stream Processors, 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

As far as performance goes, the Radeon HD 6790 should theoretically be much better than the Radeon HD 4670 1GB in general. (explain)

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

Texel Rate

The Radeon HD 6790 will be a lot (about 40%) better at anisotropic filtering 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

The Radeon HD 6790 should be a lot (approximately 124%) more effective at anti-aliasing than the Radeon HD 4670 1GB, and also able to handle higher resolutions while still performing well. (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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied 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 the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum 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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