GeForce GT 640 DDR3 vs GeForce GTX 260 Core 216

Intro

Compare all that to the GeForce GTX 260 Core 216, which has a core clock speed of 576 MHz and a GDDR3 memory speed of 999 MHz. It also features a 448-bit bus, and makes use of a 65 nm design. It is comprised of 216 SPUs, 72 TAUs, and 28 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 260 Core 216		202 Watts
	Difference: 137 Watts (211%)

Memory Bandwidth

The GeForce GTX 260 Core 216 should in theory perform a lot faster than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 260 Core 216		111888 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 54864 (96%)

Texel Rate

The GeForce GTX 260 Core 216 should be quite a bit (approximately 44%) faster with regards to AF than the GeForce GT 640 DDR3. (explain)

GeForce GTX 260 Core 216		41472 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 12672 (44%)

Pixel Rate

The GeForce GTX 260 Core 216 should be just a bit (about 12%) faster with regards to AA than the GeForce GT 640 DDR3, and also should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 260 Core 216		16128 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 1728 (12%)

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 information (measured in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 processed in one second. This number is calculated by multiplying the total amount 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core 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 many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.