Geforce GTX 770 vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which features core clock speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB		190 Watts
Geforce GTX 770		230 Watts
	Difference: 40 Watts (21%)

Memory Bandwidth

The Geforce GTX 770 should theoretically perform a lot faster than the Radeon HD 4890 1GB in general. (explain)

Geforce GTX 770		224384 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 99584 (80%)

Texel Rate

The Geforce GTX 770 will be much (more or less 235%) faster with regards to AF than the Radeon HD 4890 1GB. (explain)

Geforce GTX 770		133888 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 93888 (235%)

Pixel Rate

If running with a high screen resolution is important to you, then the Geforce GTX 770 is superior to the Radeon HD 4890 1GB, and very much so. (explain)

Geforce GTX 770		33472 Mpixels/sec
Radeon HD 4890 1GB		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 max amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. 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 also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.