Radeon HD 4730 vs Radeon HD 4770

Intro

Compare all of that to the Radeon HD 4770, which has GPU core speed of 750 MHz, and 512 MB of GDDR5 memory set to run at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon HD 4730		140 Watts
	Difference: 60 Watts (75%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4730 is 13% quicker than the Radeon HD 4770 overall, because of its greater bandwidth. (explain)

Radeon HD 4730		57600 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The Radeon HD 4770 will be a bit (approximately 7%) better at anisotropic filtering than the Radeon HD 4730. (explain)

Radeon HD 4770		24000 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 1600 (7%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4770 is superior to the Radeon HD 4730, by a large margin. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 6400 (114%)

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 largest amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at 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 can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.