GeForce GT 640 DDR3 vs Geforce GTX 670

Intro

Compare all of that to the Geforce GTX 670, which makes use of a 28 nm design. nVidia has set the core frequency at 915 MHz. The GDDR5 RAM is set to run at a frequency of 1500 MHz on this model. It features 1344 SPUs as well as 112 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

Geforce GTX 670		7351 points
GeForce GT 640 DDR3		1560 points
	Difference: 5791 (371%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Geforce GTX 670		170 Watts
	Difference: 105 Watts (162%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 670 should perform a lot faster than the GeForce GT 640 DDR3 overall. (explain)

Geforce GTX 670		192000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 134976 (237%)

Texel Rate

The Geforce GTX 670 is a lot (about 256%) faster with regards to AF than the GeForce GT 640 DDR3. (explain)

Geforce GTX 670		102480 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 73680 (256%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Geforce GTX 670 is the winner, by a large margin. (explain)

Geforce GTX 670		29280 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 14880 (103%)

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 max amount of information (in units of MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses 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 number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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