GeForce GT 640 DDR3 vs Radeon HD 6950

Intro

Compare all of that to the Radeon HD 6950, which features core speeds of 800 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 1408 SPUs as well as 88 TAUs and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

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 6950		3240 points
GeForce GT 640 DDR3		1560 points
	Difference: 1680 (108%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 6950		200 Watts
	Difference: 135 Watts (208%)

Memory Bandwidth

In theory, the Radeon HD 6950 should be 181% faster than the GeForce GT 640 DDR3 overall, because of its greater bandwidth. (explain)

Radeon HD 6950		160000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 102976 (181%)

Texel Rate

The Radeon HD 6950 will be much (about 144%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 6950		70400 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 41600 (144%)

Pixel Rate

The Radeon HD 6950 will be much (about 78%) faster with regards to AA than the GeForce GT 640 DDR3, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6950		25600 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 11200 (78%)

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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total amount of texture units of the card 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.