A Question

Compare any two graphics cards:
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Radeon HD 4670 1GB vs Radeon HD 5450

Intro

The Radeon HD 4670 1GB features a core clock speed of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory frequency of 1100 MHz. It also makes use of a 128-bit memory bus, and uses a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

Compare that to the Radeon HD 5450, which features GPU core speed of 650 MHz, and 512 MB of DDR3 RAM set to run at 800 MHz through a 64-bit bus. It also is made up of 80(16x5) Stream Processors, 8 TAUs, and 4 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

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 quite a bit 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 will be a lot (approximately 362%) better 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

If using high levels of AA is important to you, then the Radeon HD 4670 1GB is superior to the Radeon HD 5450, 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

Display Prices

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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

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
Fab Process 55 nm 40 nm
Bus PCIe 2.0 x16, AGP 8x PCIe 2.1 x16
Memory 1024 MB 512 MB
Core Speed 750 MHz 650 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 2200 MHz 1600 MHz
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
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2
Power (Max TDP) 70 watts 19 watts
Shader Model 4.1 5.0
Bandwidth 35200 MB/sec 12800 MB/sec
Texel Rate 24000 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 6000 Mpixels/sec 2600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Comments

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