Radeon HD 4730 vs Radeon HD 6770

Intro

Compare all that to the Radeon HD 6770, which has core speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 memory. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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

Theoretically speaking, the Radeon HD 6770 should perform a small bit faster than the Radeon HD 4730 overall. (explain)

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

Texel Rate

The Radeon HD 6770 is quite a bit (more or less 61%) better at AF 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 will be quite a bit (about 157%) more effective at AA than the Radeon HD 4730, and also capable of handling higher screen resolutions while still performing well. (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 information (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 can be processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core 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 output 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 reach the max fill rate.