Radeon HD 4730 vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which comes with a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 4730		140 Watts
	Difference: 32 Watts (30%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6770 should in theory be a bit superior to the Radeon HD 4730 in general. (explain)

Radeon HD 6770		67200 MB/sec
Radeon HD 4730		57600 MB/sec
	Difference: 9600 (17%)

Texel Rate

The Radeon HD 6770 should be quite a bit (more or less 61%) better at anisotropic filtering than the Radeon HD 4730. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 13600 (61%)

Pixel Rate

The Radeon HD 6770 is quite a bit (more or less 157%) better at anti-aliasing than the Radeon HD 4730, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6770		14400 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 8800 (157%)

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 max amount of data (measured in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.