Radeon HD 5770 vs Radeon HD 6990

Intro

Compare all that to the Radeon HD 6990, which has a core clock frequency of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1536 SPUs, 96 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon HD 6990		375 Watts
	Difference: 267 Watts (247%)

Memory Bandwidth

In theory, the Radeon HD 6990 should perform quite a bit faster than the Radeon HD 5770 in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 243200 (317%)

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 369%) faster with regards to anisotropic filtering than the Radeon HD 5770. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 125360 (369%)

Pixel Rate

The Radeon HD 6990 should be a lot (more or less 291%) faster with regards to FSAA than the Radeon HD 5770, and should be able to handle higher screen resolutions better. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 39520 (291%)

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 information (in units of MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 can be processed per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics 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 amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.