GeForce GT 640 DDR3 vs GeForce GTX 590

Intro

Compare those specs to the GeForce GTX 590, which has a GPU core clock speed of 607 MHz, and 1536 MB of GDDR5 RAM set to run at 855 MHz through a 384-bit bus. It also is made up of 512 SPUs, 64 TAUs, 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 590		6680 points
GeForce GT 640 DDR3		1560 points
	Difference: 5120 (328%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 590		365 Watts
	Difference: 300 Watts (462%)

Memory Bandwidth

Theoretically, the GeForce GTX 590 should be quite a bit faster than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 590		328320 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 271296 (476%)

Texel Rate

The GeForce GTX 590 will be much (approximately 170%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 590		77696 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 48896 (170%)

Pixel Rate

The GeForce GTX 590 is a lot (about 305%) faster with regards to AA than the GeForce GT 640 DDR3, and also capable of handling higher resolutions better. (explain)

GeForce GTX 590		58272 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 43872 (305%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.