Radeon HD 5770 vs Radeon HD 7850

Intro

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

Compare those specifications to the Radeon HD 7850, which has a GPU core clock speed of 860 MHz, and 2048 MB of GDDR5 memory running at 1200 MHz through a 256-bit bus. It also is comprised of 1024 SPUs, 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: Bandwidth is the max amount of data (in units of MB per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 are processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units 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 rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.