Radeon HD 4750 vs Radeon HD 6970

Intro

Compare all of that to the Radeon HD 6970, which makes use of a 40 nm design. AMD has set the core speed at 880 MHz. The GDDR5 memory is set to run at a frequency of 1375 MHz on this card. It features 1536 SPUs along with 96 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 6970		250 Watts
	Difference: 175 Watts (233%)

Memory Bandwidth

Performance-wise, the Radeon HD 6970 should in theory be a lot superior to the Radeon HD 4750 in general. (explain)

Radeon HD 6970		176000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 124800 (244%)

Texel Rate

The Radeon HD 6970 will be a lot (about 262%) more effective at anisotropic filtering than the Radeon HD 4750. (explain)

Radeon HD 6970		84480 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 61120 (262%)

Pixel Rate

The Radeon HD 6970 is quite a bit (more or less 141%) better at full screen anti-aliasing than the Radeon HD 4750, and will be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6970		28160 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 16480 (141%)

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 maximum amount of information (in units of MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 can be processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs 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 quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.