GeForce GT 640 DDR3 vs Radeon R7 250

Intro

Compare all that to the Radeon R7 250, which makes use of a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory runs at a speed of 1150 MHz on this specific model. It features 384 SPUs as well as 24 Texture Address Units and 8 ROPs.

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 R7 250		1836 points
GeForce GT 640 DDR3		1560 points
	Difference: 276 (18%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Performance-wise, the Radeon R7 250 should theoretically be a lot superior to the GeForce GT 640 DDR3 in general. (explain)

Radeon R7 250		73600 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 16576 (29%)

Texel Rate

The GeForce GT 640 DDR3 is just a bit (about 20%) better at AF than the Radeon R7 250. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 4800 (20%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GT 640 DDR3 is superior to the Radeon R7 250, and very much so. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 6400 (80%)

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 max amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the 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 texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate 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 outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant 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 max fill rate.