Radeon HD 4670 512MB vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM works at a frequency of 1125 MHz on this specific model. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 7770		80 Watts
	Difference: 10 Watts (14%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 should be a lot faster than the Radeon HD 4670 512MB in general. (explain)

Radeon HD 7770		72000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 40000 (125%)

Texel Rate

The Radeon HD 7770 is quite a bit (about 67%) more effective at texture filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 7770		40000 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 16000 (67%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7770 is superior to the Radeon HD 4670 512MB, and very much so. (explain)

Radeon HD 7770		16000 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 10000 (167%)

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 largest amount of data (counted in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number 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 drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.