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GeForce GTS 250 512MB vs Radeon HD 5770

Intro

The GeForce GTS 250 512MB features core clock speeds of 738 MHz on the GPU, and 1100 MHz on the 512 MB of GDDR3 RAM. It features 128 SPUs along with 64 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 5770, which features core speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
GeForce GTS 250 512MB		145 Watts
	Difference: 37 Watts (34%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5770 is 9% faster than the GeForce GTS 250 512MB overall, because of its greater bandwidth. (explain)

Radeon HD 5770		76800 MB/sec
GeForce GTS 250 512MB		70400 MB/sec
	Difference: 6400 (9%)

Texel Rate

The GeForce GTS 250 512MB should be much (about 39%) faster with regards to texture filtering than the Radeon HD 5770. (explain)

GeForce GTS 250 512MB		47232 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 13232 (39%)

Pixel Rate

The Radeon HD 5770 is a small bit (approximately 15%) better at FSAA than the GeForce GTS 250 512MB, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce GTS 250 512MB		11808 Mpixels/sec
	Difference: 1792 (15%)

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

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GeForce GTS 250 512MB

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Radeon HD 5770

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Specifications

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Model	GeForce GTS 250 512MB	Radeon HD 5770
Manufacturer	nVidia	AMD
Year	March 3, 2009	October 13, 2009
Code Name	G92a/b	Juniper XT
Memory	512 MB	1024 MB
Core Speed	738 MHz	850 MHz
Memory Speed	2200 MHz	4800 MHz
Power (Max TDP)	145 watts	108 watts
Bandwidth	70400 MB/sec	76800 MB/sec
Texel Rate	47232 Mtexels/sec	34000 Mtexels/sec
Pixel Rate	11808 Mpixels/sec	13600 Mpixels/sec
Unified Shaders	128	800(160x5)
Texture Mapping Units	64	40
Render Output Units	16	16
Bus Type	GDDR3	GDDR5
Bus Width	256-bit	128-bit
Fab Process	65/55 nm	40 nm
Transistors	754 million	1040 million
Bus	PCIe x16 2.0	PCIe 2.1 x16
DirectX Version	DirectX 10	DirectX 11
OpenGL Version	OpenGL 3.1	OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's 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 number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the 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 number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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