GeForce GTX 460 (OEM) vs Radeon HD 4890 2GB

Intro

Compare those specs to the Radeon HD 4890 2GB, which has a core clock speed of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 460 (OEM)		150 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 40 Watts (27%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB will be 15% faster than the GeForce GTX 460 (OEM) in general, because of its greater data rate. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GTX 460 (OEM)		108800 MB/sec
	Difference: 16000 (15%)

Texel Rate

The Radeon HD 4890 2GB should be a little bit (more or less 10%) more effective at anisotropic filtering than the GeForce GTX 460 (OEM). (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce GTX 460 (OEM)		36400 Mtexels/sec
	Difference: 3600 (10%)

Pixel Rate

The GeForce GTX 460 (OEM) is much (more or less 30%) faster with regards to anti-aliasing than the Radeon HD 4890 2GB, and also able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 460 (OEM)		20800 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 4800 (30%)

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 max amount of data (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of 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 higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.