GeForce GT 640 DDR3 vs GeForce GTX 470

Intro

Compare all that to the GeForce GTX 470, which has core clock speeds of 607 MHz on the GPU, and 837 MHz on the 1280 MB of GDDR5 RAM. It features 448 SPUs along with 56 Texture Address Units and 40 ROPs.

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

GeForce GTX 470		2937 points
GeForce GT 640 DDR3		1560 points
	Difference: 1377 (88%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 470		215 Watts
	Difference: 150 Watts (231%)

Memory Bandwidth

Performance-wise, the GeForce GTX 470 should in theory be much better than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 470		133920 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 76896 (135%)

Texel Rate

The GeForce GTX 470 should be just a bit (approximately 18%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 470		33992 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 5192 (18%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 470 is superior to the GeForce GT 640 DDR3, by far. (explain)

GeForce GTX 470		24280 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 9880 (69%)

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 max amount of data (in units of MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.