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GeForce GTX 460 vs GeForce GTX 650

Intro

The GeForce GTX 460 comes with a GPU clock speed of 675 MHz, and the 768 MB of GDDR5 memory runs at 900 MHz through a 192-bit bus. It also is comprised of 336 Stream Processors, 56 Texture Address Units, and 24 ROPs.

Compare those specifications to the GeForce GTX 650, which comes with GPU core speed of 1058 MHz, and 2048 MB of GDDR5 RAM running at 1250 MHz through a 128-bit bus. It also is made up of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
GeForce GTX 460 150 Watts
Difference: 86 Watts (134%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 460 should in theory be a small bit superior to the GeForce GTX 650 overall. (explain)

GeForce GTX 460 86400 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 6400 (8%)

Texel Rate

The GeForce GTX 460 should be just a bit (approximately 12%) better at texture filtering than the GeForce GTX 650. (explain)

GeForce GTX 460 37800 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 3944 (12%)

Pixel Rate

The GeForce GTX 650 will be a bit (about 4%) faster with regards to anti-aliasing than the GeForce GTX 460, and also will be able to handle higher screen resolutions better. (explain)

GeForce GTX 650 16928 Mpixels/sec
GeForce GTX 460 16200 Mpixels/sec
Difference: 728 (4%)

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 460

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

Model GeForce GTX 460 GeForce GTX 650
Manufacturer nVidia nVidia
Year July 2010 September 2012
Code Name GF104 GK107
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 768 MB 2048 MB
Core Speed 675 MHz 1058 MHz
Shader Speed 1350 MHz 1058 MHz
Memory Speed 900 MHz (3600 MHz effective) 1250 MHz (5000 MHz effective)
Unified Shaders 336 384
Texture Mapping Units 56 32
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.3
Power (Max TDP) 150 watts 64 watts
Shader Model 5.0 5.0
Bandwidth 86400 MB/sec 80000 MB/sec
Texel Rate 37800 Mtexels/sec 33856 Mtexels/sec
Pixel Rate 16200 Mpixels/sec 16928 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, 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 the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Comments

3 Responses to “GeForce GTX 460 vs GeForce GTX 650”
zoe says:
I purchased a GEFORCE GT620 on advice from the shop technician. Performance was dismal. An ATI Radeon HD5670 at the same price gives me a bench mark of 7.1 for graphics and gaming graphics. The old faithful GTX which cost a lot more bechmarks in at 7.6 for both tests. The GT620 comes in at 4 for the Graphics and 5.1 for gaming graphics. The GT620 2GB costs $80 and the GT630 4GB $150.
leland says:
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leland says:
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