Radeon HD 4850 512MB vs Radeon HD 7750

Intro

Compare all that to the Radeon HD 7750, which makes use of a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory runs at a speed of 1125 MHz on this card. It features 512 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 55 Watts (100%)

Memory Bandwidth

The Radeon HD 7750 should in theory be a bit faster than the Radeon HD 4850 512MB overall. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 8448 (13%)

Texel Rate

The Radeon HD 7750 is just a bit (approximately 2%) better at AF than the Radeon HD 4850 512MB. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 600 (2%)

Pixel Rate

The Radeon HD 7750 will be a lot (more or less 28%) faster with regards to anti-aliasing than the Radeon HD 4850 512MB, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 4850 512MB		10000 Mpixels/sec
	Difference: 2800 (28%)

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 (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.