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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 set the core speed at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 RAM runs at a speed of 1100 MHz on this specific card. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 ROPs.

Compare that to the Radeon HD 5450, which has GPU clock speed of 650 MHz, and 512 MB of DDR3 RAM running at 800 MHz through a 64-bit bus. It also features 80(16x5) SPUs, 8 TAUs, and 4 ROPs.

(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

In theory, the Radeon HD 4670 1GB should be 175% faster than the Radeon HD 5450 in general, because of its greater data rate. (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 much (more or less 362%) more effective at texture 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 is much (more or less 131%) faster with regards to full screen anti-aliasing than the Radeon HD 5450, and capable of handling higher 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

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

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 1100 MHz (2200 MHz effective) 800 MHz (1600 MHz effective)
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 (counted in megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to 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 maximum fill rate.

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