Radeon HD 4670 1GB vs Radeon HD 5770

Intro

Compare all of that to the Radeon HD 5770, which comes with a clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon HD 5770		108 Watts
	Difference: 38 Watts (54%)

Memory Bandwidth

The Radeon HD 5770, in theory, should be a lot faster than the Radeon HD 4670 1GB overall. (explain)

Radeon HD 5770		76800 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 41600 (118%)

Texel Rate

The Radeon HD 5770 will be a lot (approximately 42%) better at AF than the Radeon HD 4670 1GB. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 10000 (42%)

Pixel Rate

The Radeon HD 5770 should be a lot (about 127%) better at full screen anti-aliasing than the Radeon HD 4670 1GB, and will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 7600 (127%)

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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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