GeForce 8800 GTS (G80) 640MB vs Radeon R7 250

Intro

Compare all that to the Radeon R7 250, which has a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1150 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 78 Watts (120%)

Memory Bandwidth

Performance-wise, the Radeon R7 250 should theoretically be just a bit superior to the GeForce 8800 GTS (G80) 640MB overall. (explain)

Radeon R7 250		73600 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 10240 (16%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB should be just a bit (more or less 3%) more effective at anisotropic filtering than the Radeon R7 250. (explain)

GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 624 (3%)

Pixel Rate

The GeForce 8800 GTS (G80) 640MB should be a lot (more or less 28%) faster with regards to FSAA than the Radeon R7 250, and also able to handle higher resolutions without losing too much performance. (explain)

GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 2260 (28%)

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 (counted in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 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 anti-aliasing, High Dynamic Range 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 number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. 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 fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.