GeForce GTX 295 vs Radeon HD 7770

Intro

Compare all of that to the Radeon HD 7770, which features a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, 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 theoretically be 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 is a lot (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 will be a lot (about 102%) faster with regards to anti-aliasing than the Radeon HD 7770, and should 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: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 applied in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.