Radeon HD 4850 1GB vs Radeon HD 5670

Intro

Compare those specs to the Radeon HD 5670, which features core speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 400(80x5) SPUs as well as 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 4850 1GB		110 Watts
	Difference: 49 Watts (80%)

Memory Bandwidth

In theory, the Radeon HD 5670 should perform a bit faster than the Radeon HD 4850 1GB overall. (explain)

Radeon HD 5670		64000 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 448 (1%)

Texel Rate

The Radeon HD 4850 1GB will be a lot (more or less 61%) faster with regards to texture filtering than the Radeon HD 5670. (explain)

Radeon HD 4850 1GB		25000 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 9500 (61%)

Pixel Rate

The Radeon HD 4850 1GB should be a lot (about 61%) faster with regards to anti-aliasing than the Radeon HD 5670, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4850 1GB		10000 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 3800 (61%)

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

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

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