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GeForce GTS 450 vs GeForce GTX 650

Intro

The GeForce GTS 450 makes use of a 40 nm design. nVidia has clocked the core speed at 783 MHz. The GDDR5 memory is set to run at a speed of 902 MHz on this model. It features 192 SPUs along with 32 TAUs and 16 ROPs.

Compare that to the GeForce GTX 650, which comes with GPU clock speed of 1058 MHz, and 2048 MB of GDDR5 RAM set to run at 1250 MHz through a 128-bit bus. It also features 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
GeForce GTS 450 106 Watts
Difference: 42 Watts (66%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 650 should theoretically be much superior to the GeForce GTS 450 in general. (explain)

GeForce GTX 650 80000 MB/sec
GeForce GTS 450 57728 MB/sec
Difference: 22272 (39%)

Texel Rate

The GeForce GTX 650 should be much (about 35%) more effective at AF than the GeForce GTS 450. (explain)

GeForce GTX 650 33856 Mtexels/sec
GeForce GTS 450 25056 Mtexels/sec
Difference: 8800 (35%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 650 is a better choice, and very much so. (explain)

GeForce GTX 650 16928 Mpixels/sec
GeForce GTS 450 12528 Mpixels/sec
Difference: 4400 (35%)

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

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GeForce GTS 450

Amazon.com

GeForce GTX 650

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

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Model GeForce GTS 450 GeForce GTX 650
Manufacturer nVidia nVidia
Year September 2010 September 2012
Code Name GF106 GK107
Memory 512 MB 2048 MB
Core Speed 783 MHz 1058 MHz
Memory Speed 3608 MHz 5000 MHz
Power (Max TDP) 106 watts 64 watts
Bandwidth 57728 MB/sec 80000 MB/sec
Texel Rate 25056 Mtexels/sec 33856 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 16928 Mpixels/sec
Unified Shaders 192 384
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1170 million 1300 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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

Comments

One Response to “GeForce GTS 450 vs GeForce GTX 650”
Best Single Slot Video Card? - Hardware Canucks says:

[...] GeForce GTS 450 vs GeForce GTX 650 – Performance Comparison Benchmarks @ Hardware Compare Or a 640 would be very close to the performance of a GTS 450 i think! those cards are around 100$ and 80$... I would really recommend a 650 or a 640,new technology! and they are small. You are right,the 6750 is about the same performance...But well it's not a super new card :/ [...]

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