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GeForce GTX 650 vs Radeon HD 4890 2GB

Intro

The GeForce GTX 650 has a GPU clock speed of 1058 MHz, and the 2048 MB of GDDR5 RAM runs at 1250 MHz through a 128-bit bus. It also features 384 SPUs, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4890 2GB, which features a core clock frequency of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 126 Watts (197%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4890 2GB should theoretically be a lot better than the GeForce GTX 650 overall. (explain)

Radeon HD 4890 2GB 124800 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 44800 (56%)

Texel Rate

The Radeon HD 4890 2GB should be just a bit (about 18%) more effective at texture filtering than the GeForce GTX 650. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 6144 (18%)

Pixel Rate

The GeForce GTX 650 should be a small bit (more or less 6%) better at FSAA than the Radeon HD 4890 2GB, and should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 650 16928 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 928 (6%)

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

Display Prices

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GeForce GTX 650

Amazon.com

Radeon HD 4890 2GB

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

Display Specifications

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Model GeForce GTX 650 Radeon HD 4890 2GB
Manufacturer nVidia AMD
Year September 2012 Apr 2, 2009
Code Name GK107 RV790 XT
Fab Process 28 nm 55 nm
Bus PCIe 3.0 x16 PCIe 2.0 x16
Memory 2048 MB 2048 MB
Core Speed 1058 MHz 1000 MHz
Shader Speed 1058 MHz (N/A) MHz
Memory Speed 5000 MHz 3900 MHz
Unified Shaders 384 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 OpenGL 3.0
Power (Max TDP) 64 watts 190 watts
Shader Model 5.0 4.1
Bandwidth 80000 MB/sec 124800 MB/sec
Texel Rate 33856 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved 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 memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen 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 texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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