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Radeon HD 4670 1GB vs Radeon HD 7850

Intro

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

Compare those specifications to the Radeon HD 7850, which makes use of a 28 nm design. AMD has set the core frequency at 860 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this specific model. It features 1024 SPUs as well as 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

The Radeon HD 7850 should theoretically perform a lot faster than the Radeon HD 4670 1GB in general. (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 (about 129%) better at 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 lots of anti-aliasing is important to you, then the Radeon HD 7850 is superior to the Radeon HD 4670 1GB, by a large margin. (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: Bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential 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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