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Radeon HD 4650 1GB vs Radeon HD 6450 (OEM)

Intro

The Radeon HD 4650 1GB makes use of a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR3 memory works at a speed of 700 MHz on this model. It features 320(64x5) SPUs as well as 32 TAUs and 8 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6450 (OEM), which makes use of a 40 nm design. AMD has set the core speed at 625 MHz. The GDDR3 memory is set to run at a speed of 800 MHz on this particular model. It features 160 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 31 Watts
Radeon HD 4650 1GB 55 Watts
Difference: 24 Watts (77%)

Memory Bandwidth

In theory, the Radeon HD 4650 1GB should be 75% quicker than the Radeon HD 6450 (OEM) in general, due to its higher bandwidth. (explain)

Radeon HD 4650 1GB 22400 MB/sec
Radeon HD 6450 (OEM) 12800 MB/sec
Difference: 9600 (75%)

Texel Rate

The Radeon HD 4650 1GB is much (more or less 284%) better at anisotropic filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
Radeon HD 6450 (OEM) 5000 Mtexels/sec
Difference: 14200 (284%)

Pixel Rate

The Radeon HD 4650 1GB will be much (about 92%) more effective at AA than the Radeon HD 6450 (OEM), and should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
Radeon HD 6450 (OEM) 2500 Mpixels/sec
Difference: 2300 (92%)

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 6450 (OEM)

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 6450 (OEM)
Manufacturer AMD AMD
Year Sep 10, 2008 February 2011
Code Name RV730 PRO Caicos
Memory 1024 MB 512 MB
Core Speed 600 MHz 625 MHz
Memory Speed 1400 MHz 1600 MHz
Power (Max TDP) 55 watts 31 watts
Bandwidth 22400 MB/sec 12800 MB/sec
Texel Rate 19200 Mtexels/sec 5000 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 2500 Mpixels/sec
Unified Shaders 320(64x5) 160
Texture Mapping Units 32 8
Render Output Units 8 4
Bus Type GDDR3 GDDR3
Bus Width 128-bit 64-bit
Fab Process 55 nm 40 nm
Transistors 514 million 370 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 data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4650 1GB

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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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