Radeon HD 4670 512MB vs Radeon HD 7750

Intro

Compare all that to the Radeon HD 7750, which features a core clock frequency of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It features 512 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon HD 4670 512MB		70 Watts
	Difference: 15 Watts (27%)

Memory Bandwidth

Performance-wise, the Radeon HD 7750 should in theory be a lot superior to the Radeon HD 4670 512MB overall. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 40000 (125%)

Texel Rate

The Radeon HD 7750 should be a small bit (more or less 7%) more effective at AF than the Radeon HD 4670 512MB. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 1600 (7%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7750 is superior to the Radeon HD 4670 512MB, and very much so. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 6800 (113%)

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 moved over the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.