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Radeon HD 4670 1GB vs Radeon HD 7790

Intro

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

Compare all that to the Radeon HD 7790, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1500 MHz through a 128-bit bus. It also is made up of 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB 70 Watts
Radeon HD 7790 85 Watts
Difference: 15 Watts (21%)

Memory Bandwidth

The Radeon HD 7790, in theory, should perform a lot faster than the Radeon HD 4670 1GB overall. (explain)

Radeon HD 7790 96000 MB/sec
Radeon HD 4670 1GB 35200 MB/sec
Difference: 60800 (173%)

Texel Rate

The Radeon HD 7790 is quite a bit (approximately 133%) faster with regards to AF than the Radeon HD 4670 1GB. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon HD 4670 1GB 24000 Mtexels/sec
Difference: 32000 (133%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7790 is superior to the Radeon HD 4670 1GB, by a large margin. (explain)

Radeon HD 7790 16000 Mpixels/sec
Radeon HD 4670 1GB 6000 Mpixels/sec
Difference: 10000 (167%)

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

Radeon HD 7790

Amazon.com

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 7790
Manufacturer AMD AMD
Year Sep 10, 2008 March 2013
Code Name RV730 XT Bonaire XT
Fab Process 55 nm 28 nm
Bus PCIe 2.0 x16, AGP 8x PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 750 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 2200 MHz 6000 MHz
Unified Shaders 320(64x5) 896
Texture Mapping Units 32 56
Render Output Units 8 16
Bus Type GDDR4/GDDR3/DDR3/DDR2 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3
Power (Max TDP) 70 watts 85 watts
Shader Model 4.1 5.0
Bandwidth 35200 MB/sec 96000 MB/sec
Texel Rate 24000 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 6000 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 get to the max fill rate.

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