GeForce GTX 650 vs Radeon HD 7950

Intro

The GeForce GTX 650 has core clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7950, which has GPU clock speed of 800 MHz, and 1536 MB of GDDR5 memory set to run at 1250 MHz through a 384-bit bus. It also is made up of 1792 Stream Processors, 112 Texture Address Units, and 32 Raster Operation Units.

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.

GeForce GTX 650 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 7950 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce GTX 650	Radeon HD 7950
Manufacturer	nVidia	ATi
Year	September 2012	January 2012
Code Name	GK107	Tahiti Pro
Fab Process	28 nm	28 nm
Bus	PCIe 3.0 x16	PCIe 3.0 x16
Memory	2048 MB	1536 MB
Core Speed	1058 MHz	800 MHz
Shader Speed	1058 MHz	(N/A) MHz
Memory Speed	1250 MHz (5000 MHz effective)	1250 MHz (5000 MHz effective)
Unified Shaders	384	1792
Texture Mapping Units	32	112
Render Output Units	16	32
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	384-bit
DirectX Version	DirectX 11.1	DirectX 11.1
OpenGL Version	OpenGL 4.3	OpenGL 4.2
Power (Max TDP)	64 watts	200 watts
Shader Model	5.0	5.0
Bandwidth	80000 MB/sec	240000 MB/sec
Texel Rate	33856 Mtexels/sec	89600 Mtexels/sec
Pixel Rate	16928 Mpixels/sec	25600 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 are applied in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.