GeForce GT 640 DDR3 vs GeForce GTX 590

Intro

Compare all of that to the GeForce GTX 590, which features core clock speeds of 607 MHz on the GPU, and 855 MHz on the 1536 MB of GDDR5 RAM. It features 512 SPUs as well as 64 Texture Address Units and 48 Rasterization Operator Units.

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

The GeForce GTX 590, in theory, should be a lot faster than the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The GeForce GTX 590 should be quite a bit (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 quite a bit (about 305%) faster with regards to AA than the GeForce GT 640 DDR3, and also should be able to handle higher resolutions while still performing well. (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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.