GeForce 8300 GS (OEM) vs GeForce GT 640 DDR3

Intro

Compare that to the GeForce GT 640 DDR3, which uses a 28 nm design. nVidia has clocked the core frequency at 900 MHz. The DDR3 memory is set to run at a frequency of 1782 MHz on this card. It features 384 SPUs along with 32 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8300 GS (OEM)		40 Watts
GeForce GT 640 DDR3		65 Watts
	Difference: 25 Watts (63%)

Memory Bandwidth

The GeForce GT 640 DDR3, in theory, should be a lot faster than the GeForce 8300 GS (OEM) in general. (explain)

GeForce GT 640 DDR3		57024 MB/sec
GeForce 8300 GS (OEM)		6400 MB/sec
	Difference: 50624 (791%)

Texel Rate

The GeForce GT 640 DDR3 should be quite a bit (about 1500%) faster with regards to anisotropic filtering than the GeForce 8300 GS (OEM). (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
GeForce 8300 GS (OEM)		1800 Mtexels/sec
	Difference: 27000 (1500%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GT 640 DDR3 is superior to the GeForce 8300 GS (OEM), by a large margin. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
GeForce 8300 GS (OEM)		900 Mpixels/sec
	Difference: 13500 (1500%)

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: Bandwidth is the maximum amount of information (measured in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.