Geforce GTX 670 vs Radeon HD 4890 1GB

Intro

Compare all of that to the Radeon HD 4890 1GB, which features a clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit memory bus, and uses 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 670		170 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 20 Watts (12%)

Memory Bandwidth

The Geforce GTX 670 should theoretically be a lot faster than the Radeon HD 4890 1GB overall. (explain)

Geforce GTX 670		192000 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 67200 (54%)

Texel Rate

The Geforce GTX 670 should be much (approximately 156%) faster with regards to texture filtering than the Radeon HD 4890 1GB. (explain)

Geforce GTX 670		102480 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 62480 (156%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 670 is superior to the Radeon HD 4890 1GB, by a large margin. (explain)

Geforce GTX 670		29280 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 13280 (83%)

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 largest amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If it uses 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at 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 graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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 potential to reach the max fill rate.