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Radeon HD 4670 1GB vs Radeon HD 7850

Intro

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

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

Display Graphs

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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

Theoretically speaking, the Radeon HD 7850 should perform quite a bit 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 will be a lot (approximately 129%) faster with regards to texture filtering 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

The Radeon HD 7850 will be quite a bit (more or less 359%) more effective at full screen anti-aliasing than the Radeon HD 4670 1GB, and will be able to handle higher screen resolutions without losing too much performance. (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 max amount of information (measured in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum 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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