Radeon HD 5750 1GB vs Radeon HD 7870 XT

Intro

Compare those specifications to the Radeon HD 7870 XT, which makes use of a 28 nm design. AMD has set the core frequency at 925 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this card. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		86 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 99 Watts (115%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT should perform a lot faster than the Radeon HD 5750 1GB overall. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 118400 (161%)

Texel Rate

The Radeon HD 7870 XT will be quite a bit (more or less 252%) better at AF than the Radeon HD 5750 1GB. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 63600 (252%)

Pixel Rate

The Radeon HD 7870 XT will be a lot (about 164%) better at FSAA than the Radeon HD 5750 1GB, and also will be capable of handling higher resolutions better. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 18400 (164%)

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 max amount of data (counted in MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one 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 in one second.

Pixel Rate: Pixel rate is the most pixels the video 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 number of Raster Operations Pipelines by the clock 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.