GeForce GTS 250 1GB vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 1125 MHz on this model. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTS 250 1GB		145 Watts
	Difference: 65 Watts (81%)

Memory Bandwidth

In theory, the Radeon HD 7770 is 2% quicker than the GeForce GTS 250 1GB overall, because of its greater data rate. (explain)

Radeon HD 7770		72000 MB/sec
GeForce GTS 250 1GB		70400 MB/sec
	Difference: 1600 (2%)

Texel Rate

The GeForce GTS 250 1GB is a small bit (about 18%) better at texture filtering than the Radeon HD 7770. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 7232 (18%)

Pixel Rate

The Radeon HD 7770 is quite a bit (approximately 36%) faster with regards to full screen anti-aliasing than the GeForce GTS 250 1GB, and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce GTS 250 1GB		11808 Mpixels/sec
	Difference: 4192 (36%)

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 data (in units of MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 are applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics 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 maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.