GeForce 9800 GX2 vs Radeon HD 4750

Intro

Compare all of that to the Radeon HD 4750, which comes with a clock frequency of 730 MHz and a GDDR5 memory speed of 800 MHz. It also features a 128-bit bus, and uses a 40 nm design. It features 640(128x5) SPUs, 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

Theoretically, the GeForce 9800 GX2 should perform quite a bit 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 will be quite a bit (about 229%) faster with regards to 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

The GeForce 9800 GX2 should be much (approximately 64%) faster with regards to anti-aliasing than the Radeon HD 4750, and also will be able to handle higher resolutions better. (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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.