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GeForce GTX 660 vs Radeon HD 7850

Intro

The GeForce GTX 660 makes use of a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 RAM runs at a frequency of 1502 MHz on this specific card. It features 960 SPUs along with 80 TAUs and 24 Rasterization Operator Units.

Compare all that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has set the core speed at 860 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this card. It features 1024 SPUs along with 64 TAUs and 32 Rasterization Operator Units.

(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 theoretically be a bit faster than the GeForce GTX 660 overall. (explain)

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

Texel Rate

The GeForce GTX 660 will be quite a bit (approximately 42%) better at AF 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 a high resolution is important to you, then the Radeon HD 7850 is a better choice, though not by far. (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 largest amount of information (measured in MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that can be processed per second. This figure 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max 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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