Geforce GTX 670 vs Radeon HD 4770

Intro

Compare that to the Radeon HD 4770, which comes with a clock speed of 750 MHz and a GDDR5 memory frequency of 800 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Geforce GTX 670		170 Watts
	Difference: 90 Watts (113%)

Memory Bandwidth

In theory, the Geforce GTX 670 should be 275% faster than the Radeon HD 4770 overall, due to its higher data rate. (explain)

Geforce GTX 670		192000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 140800 (275%)

Texel Rate

The Geforce GTX 670 will be a lot (more or less 327%) faster with regards to AF than the Radeon HD 4770. (explain)

Geforce GTX 670		102480 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 78480 (327%)

Pixel Rate

The Geforce GTX 670 will be much (approximately 144%) faster with regards to FSAA than the Radeon HD 4770, and able to handle higher screen resolutions better. (explain)

Geforce GTX 670		29280 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 17280 (144%)

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 max amount of data (measured in MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, 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 number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number 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 drawing the pixels (image) on the screen. The actual pixel output 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 max fill rate.