GeForce GT 640 DDR3 vs Radeon R9 280

Intro

Compare those specs to the Radeon R9 280, which comes with core clock speeds of 933 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 memory. It features 1792 SPUs along with 112 Texture Address Units and 32 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 280		7961 points
GeForce GT 640 DDR3		1560 points
	Difference: 6401 (410%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R9 280		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

The Radeon R9 280 should in theory perform a lot faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon R9 280		240000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 182976 (321%)

Texel Rate

The Radeon R9 280 is a lot (approximately 263%) better at AF than the GeForce GT 640 DDR3. (explain)

Radeon R9 280		104496 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 75696 (263%)

Pixel Rate

The Radeon R9 280 should be quite a bit (approximately 107%) better at full screen anti-aliasing than the GeForce GT 640 DDR3, and able to handle higher screen resolutions better. (explain)

Radeon R9 280		29856 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 15456 (107%)

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 (in units of MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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