GeForce GT 640 DDR3 vs Radeon HD 6970

Intro

Compare all that to the Radeon HD 6970, which has clock speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 TAUs 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 6970		3470 points
GeForce GT 640 DDR3		1560 points
	Difference: 1910 (122%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 6970		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6970 should be a lot faster than the GeForce GT 640 DDR3 overall. (explain)

Radeon HD 6970		176000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 118976 (209%)

Texel Rate

The Radeon HD 6970 should be quite a bit (about 193%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 6970		84480 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 55680 (193%)

Pixel Rate

The Radeon HD 6970 will be quite a bit (more or less 96%) faster with regards to anti-aliasing than the GeForce GT 640 DDR3, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6970		28160 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 13760 (96%)

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.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can 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 Raster Operations Pipelines 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 rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.