GeForce GT 640 DDR3 vs Radeon HD 7970

Intro

Compare those specs to the Radeon HD 7970, which features clock speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator 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

Radeon HD 7970		8225 points
GeForce GT 640 DDR3		1560 points
	Difference: 6665 (427%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 7970		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

In theory, the Radeon HD 7970 should perform a lot faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon HD 7970		264000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 206976 (363%)

Texel Rate

The Radeon HD 7970 should be much (approximately 311%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 7970		118400 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 89600 (311%)

Pixel Rate

The Radeon HD 7970 will be a lot (about 106%) more effective at AA than the GeForce GT 640 DDR3, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 7970		29600 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 15200 (106%)

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 data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at 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 graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.