Radeon HD 3870 1GB vs Radeon HD 7750

Intro

The Radeon HD 3870 1GB features core speeds of 775 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR4 RAM. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 7750, which makes use of a 28 nm design. ATi has set the core frequency at 800 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this specific model. It features 512 SPUs as well as 32 Texture Address Units and 16 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 3870 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 7750 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 3870 1GB	Radeon HD 7750
Manufacturer	ATi	ATi
Year	Nov 19, 2007	February 2012
Code Name	RV670 XT	Cape Verde Pro
Fab Process	55 nm	28 nm
Bus	PCIe 2.0 x16/AGP 8x	PCIe 3.0 x16
Memory	1024 MB	1024 MB
Core Speed	775 MHz	800 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	1125 MHz	1125 MHz
Unified Shaders	320(64x5)	512
Texture Mapping Units	16	32
Render Output Units	16	16
Bus Type	GDDR4	GDDR5
Bus Width	256-bit	128-bit
DirectX Version	DirectX 10.1	DirectX 11.1
OpenGL Version	OpenGL 3.0	OpenGL 4.2
Power (Max TDP)	106 watts	55 watts
Shader Model	4.1	5.0
Bandwidth	72000 MB/sec	72000 MB/sec
Texel Rate	12400 Mtexels/sec	25600 Mtexels/sec
Pixel Rate	12400 Mpixels/sec	12800 Mpixels/sec

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

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.