GeForce GT 640 DDR3 vs GeForce GTX 480

Intro

Compare those specifications to the GeForce GTX 480, which comes with a clock speed of 700 MHz and a GDDR5 memory frequency of 924 MHz. It also uses a 384-bit bus, and uses a 40 nm design. It is made up of 480 SPUs, 60 Texture Address Units, and 48 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

GeForce GTX 480		3650 points
GeForce GT 640 DDR3		1560 points
	Difference: 2090 (134%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 480		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

The GeForce GTX 480, in theory, should perform a lot faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 480		177408 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 120384 (211%)

Texel Rate

The GeForce GTX 480 should be much (approximately 46%) faster with regards to anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 480		42000 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 13200 (46%)

Pixel Rate

The GeForce GTX 480 will be quite a bit (about 133%) faster with regards to full screen anti-aliasing than the GeForce GT 640 DDR3, and will be able to handle higher screen resolutions better. (explain)

GeForce GTX 480		33600 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 19200 (133%)

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 (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core 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 is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.