Geforce GTX 780 vs Radeon HD 4890 1GB

Intro

Compare those specifications to the Radeon HD 4890 1GB, which comes with clock speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB		190 Watts
Geforce GTX 780		250 Watts
	Difference: 60 Watts (32%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 780 is 131% faster than the Radeon HD 4890 1GB overall, because of its higher bandwidth. (explain)

Geforce GTX 780		288384 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 163584 (131%)

Texel Rate

The Geforce GTX 780 is quite a bit (more or less 314%) better at AF than the Radeon HD 4890 1GB. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 125696 (314%)

Pixel Rate

The Geforce GTX 780 is much (about 159%) faster with regards to AA than the Radeon HD 4890 1GB, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Geforce GTX 780		41424 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 25424 (159%)

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: Bandwidth is the maximum amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few 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.