GeForce GT 640 DDR3 vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which has core speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs as well as 176 TAUs and 64 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

Radeon R9 390X 8G		13555 points
GeForce GT 640 DDR3		1560 points
	Difference: 11995 (769%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 210 Watts (323%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390X 8G should theoretically be quite a bit superior to the GeForce GT 640 DDR3 in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 326976 (573%)

Texel Rate

The Radeon R9 390X 8G is a lot (about 542%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 156000 (542%)

Pixel Rate

The Radeon R9 390X 8G is a lot (about 367%) better at AA than the GeForce GT 640 DDR3, and also capable of handling higher resolutions better. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 52800 (367%)

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 data (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.