Radeon HD 3470 256MB vs Radeon HD 7770

Intro

Compare those specs to the Radeon HD 7770, which has a core clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 7770 is 137% quicker than the Radeon HD 3470 256MB overall, due to its greater data rate. (explain)

Radeon HD 7770		72000 MB/sec
Radeon HD 3470 256MB		30400 MB/sec
	Difference: 41600 (137%)

Texel Rate

The Radeon HD 7770 is quite a bit (about 1150%) better at texture filtering than the Radeon HD 3470 256MB. (explain)

Radeon HD 7770		40000 Mtexels/sec
Radeon HD 3470 256MB		3200 Mtexels/sec
	Difference: 36800 (1150%)

Pixel Rate

The Radeon HD 7770 is quite a bit (more or less 400%) better at AA than the Radeon HD 3470 256MB, and will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 7770		16000 Mpixels/sec
Radeon HD 3470 256MB		3200 Mpixels/sec
	Difference: 12800 (400%)

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 maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of 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 is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.