GeForce GTX 275 vs Radeon HD 4890 2GB

Intro

Compare all of that to the Radeon HD 4890 2GB, which features GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 975 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB		190 Watts
GeForce GTX 275		219 Watts
	Difference: 29 Watts (15%)

Memory Bandwidth

In theory, the GeForce GTX 275 is 2% quicker than the Radeon HD 4890 2GB in general, because of its greater data rate. (explain)

GeForce GTX 275		127008 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 2208 (2%)

Texel Rate

The GeForce GTX 275 is much (more or less 27%) more effective at texture filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 275		50640 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 10640 (27%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 275 is superior to the Radeon HD 4890 2GB, but only just. (explain)

GeForce GTX 275		17724 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 1724 (11%)

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 maximum amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.