GeForce GTS 250 512MB vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which comes with GPU core speed of 840 MHz, and 1024 MB of GDDR5 memory set to run at 1050 MHz through a 256-bit bus. It also is comprised of 800 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 250 512MB		145 Watts
Radeon HD 6790		150 Watts
	Difference: 5 Watts (3%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6790 should theoretically be quite a bit better than the GeForce GTS 250 512MB overall. (explain)

Radeon HD 6790		134400 MB/sec
GeForce GTS 250 512MB		70400 MB/sec
	Difference: 64000 (91%)

Texel Rate

The GeForce GTS 250 512MB should be quite a bit (approximately 41%) better at texture filtering than the Radeon HD 6790. (explain)

GeForce GTS 250 512MB		47232 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 13632 (41%)

Pixel Rate

The Radeon HD 6790 should be just a bit (about 14%) better at FSAA than the GeForce GTS 250 512MB, and able to handle higher resolutions better. (explain)

Radeon HD 6790		13440 Mpixels/sec
GeForce GTS 250 512MB		11808 Mpixels/sec
	Difference: 1632 (14%)

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 (measured in MB per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.