GeForce GTX 295 vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTX 295		289 Watts
	Difference: 209 Watts (261%)

Memory Bandwidth

The GeForce GTX 295 should in theory perform much faster than the Radeon HD 7770 overall. (explain)

GeForce GTX 295		223776 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 151776 (211%)

Texel Rate

The GeForce GTX 295 should be much (more or less 130%) faster with regards to AF than the Radeon HD 7770. (explain)

GeForce GTX 295		92160 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 52160 (130%)

Pixel Rate

The GeForce GTX 295 should be much (more or less 102%) more effective at FSAA than the Radeon HD 7770, and will be capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 295		32256 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 16256 (102%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in MB per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.