GeForce GT 640 DDR3 vs GeForce GTX 650 Ti

Intro

Compare all that to the GeForce GTX 650 Ti, which features GPU clock speed of 928 MHz, and 1024 MB of GDDR5 RAM running at 1350 MHz through a 128-bit bus. It also features 768 Stream Processors, 64 Texture Address Units, and 16 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 650 Ti		3434 points
GeForce GT 640 DDR3		1560 points
	Difference: 1874 (120%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 650 Ti		110 Watts
	Difference: 45 Watts (69%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 650 Ti should in theory be much superior to the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 650 Ti		86400 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 29376 (52%)

Texel Rate

The GeForce GTX 650 Ti should be quite a bit (approximately 106%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 650 Ti		59392 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 30592 (106%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 650 Ti is a better choice, but only just. (explain)

GeForce GTX 650 Ti		14848 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 448 (3%)

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 maximum amount of data (measured in MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.