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Radeon HD 4650 512MB vs Radeon HD 6750 1GB

Intro

The Radeon HD 4650 512MB has a GPU clock speed of 600 MHz, and the 512 MB of DDR2 RAM runs at 500 MHz through a 128-bit bus. It also features 320(64x5) Stream Processors, 32 Texture Address Units, and 8 ROPs.

Compare those specifications to the Radeon HD 6750 1GB, which has GPU core speed of 725 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also is made up of 720 Stream Processors, 36 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB 55 Watts
Radeon HD 6750 1GB 86 Watts
Difference: 31 Watts (56%)

Memory Bandwidth

The Radeon HD 6750 1GB, in theory, should perform quite a bit faster than the Radeon HD 4650 512MB in general. (explain)

Radeon HD 6750 1GB 64000 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 48000 (300%)

Texel Rate

The Radeon HD 6750 1GB is much (more or less 36%) faster with regards to anisotropic filtering than the Radeon HD 4650 512MB. (explain)

Radeon HD 6750 1GB 26100 Mtexels/sec
Radeon HD 4650 512MB 19200 Mtexels/sec
Difference: 6900 (36%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6750 1GB is the winner, by far. (explain)

Radeon HD 6750 1GB 11600 Mpixels/sec
Radeon HD 4650 512MB 4800 Mpixels/sec
Difference: 6800 (142%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 6750 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 512MB Radeon HD 6750 1GB
Manufacturer AMD AMD
Year Sep 10, 2008 January 2011
Code Name RV730 PRO Juniper Pro
Memory 512 MB 1024 MB
Core Speed 600 MHz 725 MHz
Memory Speed 1000 MHz 4000 MHz
Power (Max TDP) 55 watts 86 watts
Bandwidth 16000 MB/sec 64000 MB/sec
Texel Rate 19200 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 320(64x5) 720
Texture Mapping Units 32 36
Render Output Units 8 16
Bus Type DDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 514 million 1040 million
Bus PCIe 2.0 x16, AGP 8x PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4650 512MB

Amazon.com

Check prices at:

Radeon HD 6750 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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