Radeon R7 250X 2GB vs Radeon R9 380 4G

Intro

Compare those specs to the Radeon R9 380 4G, which makes use of a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 memory is set to run at a speed of 1425 MHz on this model. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
Radeon R9 380 4G		190 Watts
	Difference: 95 Watts (100%)

Memory Bandwidth

The Radeon R9 380 4G should theoretically be a lot faster than the Radeon R7 250X 2GB overall. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 110400 (153%)

Texel Rate

The Radeon R9 380 4G will be quite a bit (about 172%) faster with regards to AF than the Radeon R7 250X 2GB. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 68640 (172%)

Pixel Rate

The Radeon R9 380 4G is quite a bit (more or less 94%) more effective at anti-aliasing than the Radeon R7 250X 2GB, and should be able to handle higher resolutions while still performing well. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 15040 (94%)

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 (counted in megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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 of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.