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Radeon HD 4670 1GB vs Radeon HD 5450

Intro

The Radeon HD 4670 1GB uses a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 memory runs at a frequency of 1100 MHz on this specific model. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Compare those specs to the Radeon HD 5450, which comes with a clock frequency of 650 MHz and a DDR3 memory speed of 800 MHz. It also uses a 64-bit memory bus, and makes use of a 40 nm design. It is comprised of 80(16x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 4670 1GB 70 Watts
Difference: 51 Watts (268%)

Memory Bandwidth

The Radeon HD 4670 1GB should in theory perform quite a bit faster than the Radeon HD 5450 overall. (explain)

Radeon HD 4670 1GB 35200 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 22400 (175%)

Texel Rate

The Radeon HD 4670 1GB will be much (more or less 362%) better at anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 4670 1GB 24000 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 18800 (362%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4670 1GB is a better choice, and very much so. (explain)

Radeon HD 4670 1GB 6000 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 3400 (131%)

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

Radeon HD 5450

Amazon.com

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 5450
Manufacturer AMD AMD
Year Sep 10, 2008 February 4, 2010
Code Name RV730 XT Cedar PRO
Memory 1024 MB 512 MB
Core Speed 750 MHz 650 MHz
Memory Speed 2200 MHz 1600 MHz
Power (Max TDP) 70 watts 19 watts
Bandwidth 35200 MB/sec 12800 MB/sec
Texel Rate 24000 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 6000 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 320(64x5) 80(16x5)
Texture Mapping Units 32 8
Render Output Units 8 4
Bus Type GDDR4/GDDR3/DDR3/DDR2 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 largest amount of data (counted in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 that the graphics card could possibly write to the local memory per 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 - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Comments

2 Responses to “Radeon HD 4670 1GB vs Radeon HD 5450”
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