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Radeon HD 4670 1GB vs Radeon HD 7790

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 TAUs and 8 ROPs.

Compare that to the Radeon HD 7790, which has clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

(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

Theoretically speaking, the Radeon HD 7790 will be 173% faster than the Radeon HD 4670 1GB in general, because of its higher data rate. (explain)

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

Texel Rate

The Radeon HD 7790 should be a lot (about 133%) better at texture filtering 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 a high resolution 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

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

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 1100 MHz (2200 MHz effective) 1500 MHz (6000 MHz effective)
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 maximum amount of data (counted in megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics 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 Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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