Geforce GTX 690 vs Radeon HD 7770

Intro

Compare all that to the Radeon HD 7770, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Geforce GTX 690		13111 points
Radeon HD 7770		3180 points
	Difference: 9931 (312%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Geforce GTX 690		300 Watts
	Difference: 220 Watts (275%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 690 should in theory be quite a bit superior to the Radeon HD 7770 overall. (explain)

Geforce GTX 690		384512 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 312512 (434%)

Texel Rate

The Geforce GTX 690 is a lot (more or less 486%) better at texture filtering than the Radeon HD 7770. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 194240 (486%)

Pixel Rate

The Geforce GTX 690 will be much (more or less 266%) better at AA than the Radeon HD 7770, and will be able to handle higher resolutions without losing too much performance. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 42560 (266%)

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 max amount of data (in units of MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its 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 card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). 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 get to the maximum fill rate.