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Radeon HD 4670 1GB vs Radeon HD 7790

Intro

The Radeon HD 4670 1GB has a core clock speed of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory frequency of 1100 MHz. It also features a 128-bit bus, and uses a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

Compare all that to the Radeon HD 7790, which features a clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is comprised of 896 SPUs, 56 Texture Address Units, 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

In theory, the Radeon HD 7790 is 173% faster than the Radeon HD 4670 1GB in general, because of its higher bandwidth. (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 quite a bit (about 133%) faster with regards to 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

The Radeon HD 7790 will be quite a bit (approximately 167%) better at AA than the Radeon HD 4670 1GB, and also should be able to handle higher screen resolutions without slowing down too much. (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 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 (measured in MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. 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 fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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