GeForce GTX 650 vs Radeon HD 6990

Intro

Compare those specs to the Radeon HD 6990, which has a core clock speed of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It features 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

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

Radeon HD 6990		5820 points
GeForce GTX 650		2263 points
	Difference: 3557 (157%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 6990		375 Watts
	Difference: 311 Watts (486%)

Memory Bandwidth

In theory, the Radeon HD 6990 is 300% faster than the GeForce GTX 650 in general, due to its higher bandwidth. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 240000 (300%)

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 371%) better at AF than the GeForce GTX 650. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 125504 (371%)

Pixel Rate

The Radeon HD 6990 is much (approximately 214%) faster with regards to full screen anti-aliasing than the GeForce GTX 650, and also capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 36192 (214%)

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 moved across the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 are processed per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.