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Radeon HD 4670 1GB vs Radeon HD 7850

Intro

The Radeon HD 4670 1GB comes with a core clock speed of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory speed of 1100 MHz. It also uses a 128-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Compare those specifications to the Radeon HD 7850, which features core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs along with 64 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB 70 Watts
Radeon HD 7850 130 Watts
Difference: 60 Watts (86%)

Memory Bandwidth

In theory, the Radeon HD 7850 should be 336% faster than the Radeon HD 4670 1GB overall, due to its greater data rate. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 4670 1GB 35200 MB/sec
Difference: 118400 (336%)

Texel Rate

The Radeon HD 7850 is quite a bit (more or less 129%) faster with regards to AF than the Radeon HD 4670 1GB. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 4670 1GB 24000 Mtexels/sec
Difference: 31040 (129%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7850 is the winner, and very much so. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 4670 1GB 6000 Mpixels/sec
Difference: 21520 (359%)

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 7850

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 7850
Manufacturer AMD AMD
Year Sep 10, 2008 March 2012
Code Name RV730 XT Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 750 MHz 860 MHz
Memory Speed 2200 MHz 4800 MHz
Power (Max TDP) 70 watts 130 watts
Bandwidth 35200 MB/sec 153600 MB/sec
Texel Rate 24000 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 6000 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 320(64x5) 1024
Texture Mapping Units 32 64
Render Output Units 8 32
Bus Type GDDR4/GDDR3/DDR3/DDR2 GDDR5
Bus Width 128-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 514 million 2800 million
Bus PCIe 2.0 x16, AGP 8x PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4670 1GB

Amazon.com

Check prices at:

Radeon HD 7850

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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