Radeon HD 5770 vs Radeon HD 7850

Intro

The Radeon HD 5770 comes with a clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare that to the Radeon HD 7850, which makes use of a 28 nm design. ATi has set the core frequency at 860 MHz. The GDDR5 memory is set to run at a speed of 1200 MHz on this model. It features 1024 SPUs along with 64 Texture Address Units and 32 ROPs.

Price Comparison

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 5770 Amazon.com Other US-based stores

Radeon HD 7850 Amazon.com Other US-based stores

Specifications

Model	Radeon HD 5770	Radeon HD 7850
Manufacturer	ATi	ATi
Year	October 13, 2009	March 2012
Code Name	Juniper XT	Pitcairn Pro
Fab Process	40 nm	28 nm
Bus	PCIe 2.1 x16	PCIe 3.0 x16
Memory	1024 MB	2048 MB
Core Speed	850 MHz	860 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	1200 MHz (4800 MHz effective)	1200 MHz (4800 MHz effective)
Unified Shaders	800(160x5)	1024
Texture Mapping Units	40	64
Render Output Units	16	32
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	256-bit
DirectX Version	DirectX 11	DirectX 11.1
OpenGL Version	OpenGL 3.2	OpenGL 4.2
Power (Max TDP)	108 watts	130 watts
Shader Model	5.0	5.0
Bandwidth	76800 MB/sec	153600 MB/sec
Texel Rate	34000 Mtexels/sec	55040 Mtexels/sec
Pixel Rate	13600 Mpixels/sec	27520 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's 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 fill 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 ability to get to the maximum fill rate.