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GeForce GTX 650 vs GeForce GTX 660

Intro

The GeForce GTX 650 makes use of a 28 nm design. nVidia has clocked the core frequency at 1058 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this particular card. It features 384 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all that to the GeForce GTX 660, which comes with a clock speed of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also uses a 192-bit bus, and uses a 28 nm design. It is made up of 960 SPUs, 80 Texture Address Units, and 24 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
GeForce GTX 660 140 Watts
Difference: 76 Watts (119%)

Memory Bandwidth

Theoretically, the GeForce GTX 660 should perform a lot faster than the GeForce GTX 650 overall. (explain)

GeForce GTX 660 144192 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 64192 (80%)

Texel Rate

The GeForce GTX 660 is much (about 132%) better at anisotropic filtering than the GeForce GTX 650. (explain)

GeForce GTX 660 78400 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 44544 (132%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 660 is the winner, and very much so. (explain)

GeForce GTX 660 23520 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 6592 (39%)

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 650

Amazon.com

GeForce GTX 660

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 650 GeForce GTX 660
Manufacturer nVidia nVidia
Year September 2012 September 2012
Code Name GK107 GK106
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 1058 MHz 980 MHz
Shader Speed 1058 MHz 980 MHz
Memory Speed 1250 MHz (5000 MHz effective) 1502 MHz (6008 MHz effective)
Unified Shaders 384 960
Texture Mapping Units 32 80
Render Output Units 16 24
Bus Type GDDR5 GDDR5
Bus Width 128-bit 192-bit
DirectX Version DirectX 11.0 DirectX 11.0
OpenGL Version OpenGL 4.3 OpenGL 4.3
Power (Max TDP) 64 watts 140 watts
Shader Model 5.0 5.0
Bandwidth 80000 MB/sec 144192 MB/sec
Texel Rate 33856 Mtexels/sec 78400 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 23520 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. 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 rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Comments

14 Responses to “GeForce GTX 650 vs GeForce GTX 660”
Compare says:
This is a good comparison of GeForce GTX 650 vs GeForce GTX 660
Compare says:
This is not a good comparison of GeForce GTX 650 vs GeForce GTX 660
Compare says:
I have conflicting emotions about whether this is a good comparison of GeForce GTX 650 vs GeForce GTX 660
compare says:
This is/isn't a good comparison of GeForce GTX 650 vs GeForce GTX 660 at same time!
Compare says:
This is a mildy awesome comparison of Geforce GTX 650 vs GeForce GTX 660
Compare says:
This comparison of Geforce GTX 650 vs GeForce GTX 660 has potential but must try harder
Compare says:
This comparison of Geforce GTX 650 vs GeForce GTX 660 is a comparison.
Erbil says:
Och du Jockel sach bloss -.-
Compare says:
This comparison of Geforce GTX 650 vs GeForce GTX 660 is worth a nutsack.
Viprus says:
I'm Commander Shepard and this is my favorite comparison of Geforce GTX 650 vs GeForce GTX 660 on the Citadel.
Somebuyd says:
Vhat das da fox say ? 660 dingoring
Compare says:
A good comparison of GeForce GTX 650 vs Geforce GTX 660 or not, this is.
Compare says:
This is a comparison.
trent says:
I wonder about the performance of the 650SC vs 660...

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