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Radeon HD 4650 1GB vs Radeon HD 5450

Intro

The Radeon HD 4650 1GB comes with a GPU core clock speed of 600 MHz, and the 1024 MB of GDDR3 memory runs at 700 MHz through a 128-bit bus. It also features 320(64x5) Stream Processors, 32 Texture Address Units, and 8 ROPs.

Compare those specs to the Radeon HD 5450, which has core speeds of 650 MHz on the GPU, and 800 MHz on the 512 MB of DDR3 memory. It features 80(16x5) SPUs as well as 8 TAUs and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 4650 1GB 55 Watts
Difference: 36 Watts (189%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4650 1GB should in theory be quite a bit superior to the Radeon HD 5450 overall. (explain)

Radeon HD 4650 1GB 22400 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 9600 (75%)

Texel Rate

The Radeon HD 4650 1GB will be a lot (approximately 269%) faster with regards to texture filtering than the Radeon HD 5450. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 14000 (269%)

Pixel Rate

The Radeon HD 4650 1GB should be much (more or less 85%) better at full screen anti-aliasing than the Radeon HD 5450, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 2200 (85%)

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

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Radeon HD 5450

Amazon.com

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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 5450
Manufacturer AMD AMD
Year Sep 10, 2008 February 4, 2010
Code Name RV730 PRO Cedar PRO
Memory 1024 MB 512 MB
Core Speed 600 MHz 650 MHz
Memory Speed 1400 MHz 1600 MHz
Power (Max TDP) 55 watts 19 watts
Bandwidth 22400 MB/sec 12800 MB/sec
Texel Rate 19200 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 320(64x5) 80(16x5)
Texture Mapping Units 32 8
Render Output Units 8 4
Bus Type GDDR3 DDR3
Bus Width 128-bit 64-bit
Fab Process 55 nm 40 nm
Transistors 514 million 292 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 3.2

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, 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 that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 4650 1GB

Amazon.com

Check prices at:

Radeon HD 5450

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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