Geforce GTX 770 vs Radeon HD 4890 2GB

Intro

Compare all of that to the Radeon HD 4890 2GB, which comes with GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 975 MHz through a 256-bit bus. It also is comprised of 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 770		230 Watts
	Difference: 40 Watts (21%)

Memory Bandwidth

In theory, the Geforce GTX 770 is 80% faster than the Radeon HD 4890 2GB overall, due to its greater bandwidth. (explain)

Geforce GTX 770		224384 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 99584 (80%)

Texel Rate

The Geforce GTX 770 will be quite a bit (approximately 235%) better at texture filtering than the Radeon HD 4890 2GB. (explain)

Geforce GTX 770		133888 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 93888 (235%)

Pixel Rate

The Geforce GTX 770 should be a lot (approximately 109%) faster with regards to FSAA than the Radeon HD 4890 2GB, and capable of handling higher screen resolutions better. (explain)

Geforce GTX 770		33472 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 17472 (109%)

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 information (measured in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.