GeForce GT 640 DDR3 vs Radeon HD 7950

Intro

Compare all that to the Radeon HD 7950, which comes with a core clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 384-bit bus, and uses a 28 nm design. It features 1792 SPUs, 112 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 7950		7731 points
GeForce GT 640 DDR3		1560 points
	Difference: 6171 (396%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 7950		200 Watts
	Difference: 135 Watts (208%)

Memory Bandwidth

Theoretically, the Radeon HD 7950 should perform much faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon HD 7950		240000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 182976 (321%)

Texel Rate

The Radeon HD 7950 will be a lot (about 211%) better at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 7950		89600 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 60800 (211%)

Pixel Rate

The Radeon HD 7950 is quite a bit (about 78%) better at anti-aliasing than the GeForce GT 640 DDR3, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 7950		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 information (measured in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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