GeForce GTS 450 1GB vs Radeon HD 4770

Intro

The GeForce GTS 450 1GB comes with a GPU core speed of 783 MHz, and the 1024 MB of GDDR5 memory runs at 902 MHz through a 128-bit bus. It also features 192 Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 4770, which has core clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Price Comparison

GeForce GTS 450 1GB Amazon.com

Radeon HD 4770 Amazon.com

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

Model	GeForce GTS 450 1GB	Radeon HD 4770
Manufacturer	nVidia	AMD
Year	September 2010	Apr 28, 2009
Code Name	GF106	RV740
Fab Process	40 nm	40 nm
Bus	PCIe x16	PCIe 2.0 x16
Memory	1024 MB	512 MB
Core Speed	783 MHz	750 MHz
Shader Speed	1566 MHz	(N/A) MHz
Memory Speed	902 MHz (3608 MHz effective)	800 MHz (3200 MHz effective)
Unified Shaders	192	640(128x5)
Texture Mapping Units	32	32
Render Output Units	16	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
DirectX Version	DirectX 11	DirectX 10.1
OpenGL Version	OpenGL 4.1	OpenGL 3.0
Power (Max TDP)	106 watts	80 watts
Shader Model	5.0	4.1
Bandwidth	57728 MB/sec	51200 MB/sec
Texel Rate	25056 Mtexels/sec	24000 Mtexels/sec
Pixel Rate	12528 Mpixels/sec	12000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.