Radeon HD 5770 vs Radeon HD 7850

Intro

The Radeon HD 5770 has a clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 7850, which comes with GPU clock speed of 860 MHz, and 2048 MB of GDDR5 memory running at 1200 MHz through a 256-bit bus. It also is made up of 1024 Stream Processors, 64 Texture Address Units, and 32 ROPs.

Price Comparison

Radeon HD 5770 Amazon.com

Radeon HD 7850 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	Radeon HD 5770	Radeon HD 7850
Manufacturer	AMD	AMD
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 transferred across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many 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.