GeForce 9800 GX2 vs Radeon HD 4750

Intro

Compare all that to the Radeon HD 4750, which uses a 40 nm design. AMD has clocked the core frequency at 730 MHz. The GDDR5 memory works at a speed of 800 MHz on this particular model. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
GeForce 9800 GX2		197 Watts
	Difference: 122 Watts (163%)

Memory Bandwidth

The GeForce 9800 GX2, in theory, should perform much faster than the Radeon HD 4750 overall. (explain)

GeForce 9800 GX2		128000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 76800 (150%)

Texel Rate

The GeForce 9800 GX2 should be a lot (approximately 229%) more effective at anisotropic filtering than the Radeon HD 4750. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 53440 (229%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 9800 GX2 is the winner, and very much so. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 7520 (64%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 can be processed in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.