Geforce GTX 680 vs Radeon HD 4750

Intro

Compare that to the Radeon HD 4750, which has a core clock frequency of 730 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Geforce GTX 680		195 Watts
	Difference: 120 Watts (160%)

Memory Bandwidth

The Geforce GTX 680 should in theory be quite a bit faster than the Radeon HD 4750 in general. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 141056 (276%)

Texel Rate

The Geforce GTX 680 will be quite a bit (more or less 451%) better at anisotropic filtering than the Radeon HD 4750. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 105408 (451%)

Pixel Rate

If using high levels of AA is important to you, then the Geforce GTX 680 is a better choice, and very much so. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 20512 (176%)

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 data (counted in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.