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Radeon HD 4670 1GB vs Radeon HD 7790

Intro

The Radeon HD 4670 1GB comes with a GPU core speed of 750 MHz, and the 1024 MB of GDDR4/GDDR3/DDR3/DDR2 memory is set to run at 1100 MHz through a 128-bit bus. It also is comprised of 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

Compare those specs to the Radeon HD 7790, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1500 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

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

Theoretically speaking, the Radeon HD 7790 should be 173% quicker 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 will be quite a bit (more or less 133%) more effective 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 using high levels of AA is important to you, then the Radeon HD 7790 is the winner, and very much so. (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 information (in units of MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, 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 that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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