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GeForce 940M vs Radeon HD 4650 512MB

Intro

The GeForce 940M uses a 28 nm design. nVidia has clocked the core speed at 1072 MHz. The DDR3 RAM is set to run at a speed of 1000 MHz on this particular card. It features 384 SPUs along with 24 TAUs and 8 ROPs.

Compare that to the Radeon HD 4650 512MB, which has a core clock frequency of 600 MHz and a DDR2 memory frequency of 500 MHz. It also features a 128-bit memory bus, and makes use of a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have the exact same memory bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The GeForce 940M will be quite a bit (more or less 34%) better at anisotropic filtering than the Radeon HD 4650 512MB. (explain)

GeForce 940M 25728 Mtexels/sec
Radeon HD 4650 512MB 19200 Mtexels/sec
Difference: 6528 (34%)

Pixel Rate

The GeForce 940M is quite a bit (approximately 79%) better at anti-aliasing than the Radeon HD 4650 512MB, and will be able to handle higher screen resolutions better. (explain)

GeForce 940M 8576 Mpixels/sec
Radeon HD 4650 512MB 4800 Mpixels/sec
Difference: 3776 (79%)

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 940M

Amazon.com

Check prices at:

Radeon HD 4650 512MB

Amazon.com

Check prices at:

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 940M Radeon HD 4650 512MB
Manufacturer nVidia AMD
Year March 12 2015 Sep 10, 2008
Code Name GM108 RV730 PRO
Memory 2048 MB 512 MB
Core Speed 1072 MHz 600 MHz
Memory Speed 2000 MHz 1000 MHz
Power (Max TDP) (Unknown) watts 55 watts
Bandwidth 16000 MB/sec 16000 MB/sec
Texel Rate 25728 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 8576 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 384 320(64x5)
Texture Mapping Units 24 32
Render Output Units 8 8
Bus Type DDR3 DDR2
Bus Width 64-bit 128-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 514 million
Bus PCIe 3.0 x16 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 940M

Amazon.com

Check prices at:

Radeon HD 4650 512MB

Amazon.com

Check prices at:

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.

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