GeForce GT 220 GDDR3 vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which makes use of a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this specific model. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 7990		375 Watts
	Difference: 317 Watts (547%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should theoretically be a lot superior to the GeForce GT 220 GDDR3 overall. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 543616 (1679%)

Texel Rate

The Radeon HD 7990 should be much (about 2332%) better at texture filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 233200 (2332%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is a better choice, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 55800 (1116%)

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 largest amount of information (in units of megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount 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 calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.