Radeon HD 4730 vs Radeon HD 7770

Intro

Compare all of that to the Radeon HD 7770, which features core speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon HD 4730		140 Watts
	Difference: 60 Watts (75%)

Memory Bandwidth

In theory, the Radeon HD 7770 will be 25% faster than the Radeon HD 4730 overall, due to its greater data rate. (explain)

Radeon HD 7770		72000 MB/sec
Radeon HD 4730		57600 MB/sec
	Difference: 14400 (25%)

Texel Rate

The Radeon HD 7770 should be much (more or less 79%) faster with regards to anisotropic filtering than the Radeon HD 4730. (explain)

Radeon HD 7770		40000 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 17600 (79%)

Pixel Rate

The Radeon HD 7770 is quite a bit (about 186%) more effective at anti-aliasing than the Radeon HD 4730, and should be capable of handling higher resolutions better. (explain)

Radeon HD 7770		16000 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 10400 (186%)

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 (in units of MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics 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 most pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour 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 is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.