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Radeon HD 4650 1GB vs Radeon HD 6670 (OEM) 1GB

Intro

The Radeon HD 4650 1GB has a clock frequency of 600 MHz and a GDDR3 memory frequency of 700 MHz. It also uses a 128-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Compare that to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this particular card. It features 480 SPUs as well as 24 TAUs and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB 55 Watts
Radeon HD 6670 (OEM) 1GB 63 Watts
Difference: 8 Watts (15%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6670 (OEM) 1GB should perform quite a bit faster than the Radeon HD 4650 1GB in general. (explain)

Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 41600 (186%)

Texel Rate

Both cards have the exact same texel rate, so theoretically they should perform equally good at at anisotropic filtering. (explain)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6670 (OEM) 1GB is the winner, by a large margin. (explain)

Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Radeon HD 4650 1GB 4800 Mpixels/sec
Difference: 1600 (33%)

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 4650 1GB

Amazon.com

Check prices at:

Radeon HD 6670 (OEM) 1GB

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 4650 1GB Radeon HD 6670 (OEM) 1GB
Manufacturer AMD AMD
Year Sep 10, 2008 February 2011
Code Name RV730 PRO Turks
Memory 1024 MB 1024 MB
Core Speed 600 MHz 800 MHz
Memory Speed 1400 MHz 4000 MHz
Power (Max TDP) 55 watts 63 watts
Bandwidth 22400 MB/sec 64000 MB/sec
Texel Rate 19200 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 320(64x5) 480
Texture Mapping Units 32 24
Render Output Units 8 8
Bus Type GDDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 514 million 715 million
Bus PCIe 2.0 x16, AGP 8x PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (measured in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure 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 also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4650 1GB

Amazon.com

Check prices at:

Radeon HD 6670 (OEM) 1GB

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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