GeForce GT 640 DDR3 vs Geforce GTX 780

Intro

Compare all that to the Geforce GTX 780, which features a GPU core clock speed of 863 MHz, and 3072 MB of GDDR5 memory running at 1502 MHz through a 384-bit bus. It also features 2304 Stream Processors, 192 TAUs, and 48 Raster Operation 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

Geforce GTX 780		10082 points
GeForce GT 640 DDR3		1560 points
	Difference: 8522 (546%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Geforce GTX 780		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

In theory, the Geforce GTX 780 should perform quite a bit faster than the GeForce GT 640 DDR3 in general. (explain)

Geforce GTX 780		288384 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 231360 (406%)

Texel Rate

The Geforce GTX 780 is much (about 475%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 136896 (475%)

Pixel Rate

If running with a high resolution is important to you, then the Geforce GTX 780 is superior to the GeForce GT 640 DDR3, by far. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 27024 (188%)

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 information (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.