GeForce GT 640 DDR3 vs GeForce GTX 950

Intro

Compare all that to the GeForce GTX 950, which has a core clock frequency of 1024 MHz and a GDDR5 memory speed of 1652 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 768 SPUs, 48 TAUs, and 32 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 950		6536 points
GeForce GT 640 DDR3		1560 points
	Difference: 4976 (319%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 950		90 Watts
	Difference: 25 Watts (38%)

Memory Bandwidth

The GeForce GTX 950 should in theory perform a lot faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 950		105728 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 48704 (85%)

Texel Rate

The GeForce GTX 950 is much (more or less 71%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 950		49152 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 20352 (71%)

Pixel Rate

The GeForce GTX 950 will be quite a bit (approximately 128%) faster with regards to anti-aliasing than the GeForce GT 640 DDR3, and able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 950		32768 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 18368 (128%)

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 MB per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 most pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.