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GeForce GTX 660 vs Radeon HD 7850

Intro

The GeForce GTX 660 has a GPU core speed of 980 MHz, and the 2048 MB of GDDR5 memory runs at 1502 MHz through a 192-bit bus. It also features 960 SPUs, 80 Texture Address Units, and 24 Raster Operation Units.

Compare those specifications to the Radeon HD 7850, which comes with core speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs along with 64 Texture Address Units and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
GeForce GTX 660 140 Watts
Difference: 10 Watts (8%)

Memory Bandwidth

The Radeon HD 7850 should in theory perform just a bit faster than the GeForce GTX 660 in general. (explain)

Radeon HD 7850 153600 MB/sec
GeForce GTX 660 144192 MB/sec
Difference: 9408 (7%)

Texel Rate

The GeForce GTX 660 should be quite a bit (approximately 42%) faster with regards to texture filtering than the Radeon HD 7850. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 23360 (42%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7850 is superior to the GeForce GTX 660, not by a very large margin though. (explain)

Radeon HD 7850 27520 Mpixels/sec
GeForce GTX 660 23520 Mpixels/sec
Difference: 4000 (17%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

GeForce GTX 660

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 GeForce GTX 660 Radeon HD 7850
Manufacturer nVidia AMD
Year September 2012 March 2012
Code Name GK106 Pitcairn Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 980 MHz 860 MHz
Shader Speed 980 MHz (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 960 1024
Texture Mapping Units 80 64
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2
Power (Max TDP) 140 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 144192 MB/sec 153600 MB/sec
Texel Rate 78400 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 are processed per second. This is calculated 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 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 amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

16 Responses to “GeForce GTX 660 vs Radeon HD 7850”
Xshad0w says:
i have sapphire 7850 2gb oc but gtx 660 better
paratha says:
evga gtx660 is alot better than 7850.Gtx660 beat 7850 easily
Aero says:
I bought the GTX 660 for 1366x768, and easily touched 60fps at all games
Bangladeshi Ranjan says:
Bangladeshi Ranjan says:
Can anyone ans is texal rate so important?
burakgon says:
I have a 7850 OC. That's dumb. 660 is much and much better! Even for linux.
jim says:
660 or 7850 oc...
jovancecar says:
is amd better on 1680 X 1080
eng_borek says:
as an engineer i'd say all those tests are more or less biased.

from a sticktly technical point of view hd7850 should be a much more powerful card

it's not only about the gpu /memory clocks

hd 7850 is much more customizable and OC-efficient.

lewis says:
I have the 660 and my friend has the 7850, when we compared frames on games such as bf3 and wow (using same processor) the 660 came out on top by about 5 fps
Joshua A. says:
I think the saddest part about this benchmark is, AMD's 7850 is $100 cheaper.
Zhao says:
gtx 660 is in stock better than the 7850 in stock clock, but when it comes to overclocking, the 7850 has a little advantage overall. Still nvidia has physx built in :)
qadqe says:
me cago en tus muertos
Evans Young says:
i won the gtx 660 evga for the win signature 2 edition and its blazing fast.
RedDevil90 says:
Hi,im thinking on buying one of the two.And i just want to know which is better the gtx 660 or the 7850?
killermenpl says:
Which is better if I have AMD A10-5800k APU?

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