GeForce GTX 285 1GB vs Radeon HD 4890 1GB

Intro

Compare all that to the Radeon HD 4890 1GB, which features a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 975 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB		190 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 14 Watts (7%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB should perform a lot faster than the Radeon HD 4890 1GB overall. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 34176 (27%)

Texel Rate

The GeForce GTX 285 1GB will be much (more or less 30%) more effective at anisotropic filtering than the Radeon HD 4890 1GB. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 11840 (30%)

Pixel Rate

The GeForce GTX 285 1GB will be a lot (more or less 30%) faster with regards to FSAA than the Radeon HD 4890 1GB, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 4736 (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 largest amount of data (in units of MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it must 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its 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 card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.