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Radeon HD 4670 1GB vs Radeon HD 5450

Intro

The Radeon HD 4670 1GB has a GPU core clock speed of 750 MHz, and the 1024 MB of GDDR4/GDDR3/DDR3/DDR2 memory runs at 1100 MHz through a 128-bit bus. It also is comprised of 320(64x5) SPUs, 32 TAUs, 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 RAM. 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 4670 1GB 70 Watts
Difference: 51 Watts (268%)

Memory Bandwidth

The Radeon HD 4670 1GB, in theory, should be a lot faster than the Radeon HD 5450 in general. (explain)

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

Texel Rate

The Radeon HD 4670 1GB should be a lot (about 362%) more effective at AF 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 is quite a bit (approximately 131%) better at AA than the Radeon HD 5450, and also will be able to handle higher screen resolutions while still performing well. (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

Radeon HD 4670 1GB

Radeon HD 5450

Specifications

Display 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 max amount of data (in units of MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Radeon HD 4670 1GB

Radeon HD 5450

Comments

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