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GeForce 9800 GT 1GB vs Radeon HD 4770

Intro

The GeForce 9800 GT 1GB makes use of a 65/55 nm design. nVidia has clocked the core speed at 600 MHz. The GDDR3 RAM is set to run at a speed of 900 MHz on this particular model. It features 112 SPUs as well as 56 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 4770, which uses a 40 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory works at a speed of 800 MHz on this specific model. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce 9800 GT 1GB		105 Watts
	Difference: 25 Watts (31%)

Memory Bandwidth

The GeForce 9800 GT 1GB should in theory be a bit faster than the Radeon HD 4770 in general. (explain)

GeForce 9800 GT 1GB		57600 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The GeForce 9800 GT 1GB is a lot (approximately 40%) more effective at AF than the Radeon HD 4770. (explain)

GeForce 9800 GT 1GB		33600 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 9600 (40%)

Pixel Rate

The Radeon HD 4770 should be a lot (approximately 25%) better at FSAA than the GeForce 9800 GT 1GB, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce 9800 GT 1GB		9600 Mpixels/sec
	Difference: 2400 (25%)

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 9800 GT 1GB

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Radeon HD 4770

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model	GeForce 9800 GT 1GB	Radeon HD 4770
Manufacturer	nVidia	AMD
Year	July 2008	Apr 28, 2009
Code Name	G92a/b	RV740
Memory	1024 MB	512 MB
Core Speed	600 MHz	750 MHz
Memory Speed	1800 MHz	3200 MHz
Power (Max TDP)	105 watts	80 watts
Bandwidth	57600 MB/sec	51200 MB/sec
Texel Rate	33600 Mtexels/sec	24000 Mtexels/sec
Pixel Rate	9600 Mpixels/sec	12000 Mpixels/sec
Unified Shaders	112	640(128x5)
Texture Mapping Units	56	32
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	826 million
Bus	PCIe x16 2.0	PCIe 2.0 x16
DirectX Version	DirectX 10	DirectX 10.1
OpenGL Version	OpenGL 3.0	OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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 max fill rate.

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