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Radeon HD 4670 1GB vs Radeon HD 5450


Intro

The Radeon HD 4670 1GB makes use of a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 RAM works at a frequency of 1100 MHz on this particular 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 speed of 650 MHz and a DDR3 memory speed of 800 MHz. It also features a 64-bit memory bus, and uses a 40 nm design. It is made up of 80(16x5) SPUs, 8 TAUs, and 4 ROPs.

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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

As far as performance goes, the Radeon HD 4670 1GB should in theory be much better 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 is a lot (more or less 362%) more effective 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

The Radeon HD 4670 1GB will be quite a bit (more or less 131%) more effective at FSAA than the Radeon HD 5450, and also will be able to handle higher screen resolutions without losing too much performance. (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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

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.

Comments

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