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GeForce GTS 250 1GB vs Radeon HD 4650 1GB

Intro

The GeForce GTS 250 1GB features a core clock speed of 738 MHz and a GDDR3 memory frequency of 1100 MHz. It also makes use of a 256-bit memory bus, and uses a 65/55 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 4650 1GB, which features GPU core speed of 600 MHz, and 1024 MB of GDDR3 RAM set to run at 700 MHz through a 128-bit bus. It also is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB 55 Watts
GeForce GTS 250 1GB 145 Watts
Difference: 90 Watts (164%)

Memory Bandwidth

As far as performance goes, the GeForce GTS 250 1GB should theoretically be a lot better than the Radeon HD 4650 1GB overall. (explain)

GeForce GTS 250 1GB 70400 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 48000 (214%)

Texel Rate

The GeForce GTS 250 1GB will be much (approximately 146%) better at AF than the Radeon HD 4650 1GB. (explain)

GeForce GTS 250 1GB 47232 Mtexels/sec
Radeon HD 4650 1GB 19200 Mtexels/sec
Difference: 28032 (146%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTS 250 1GB is a better choice, by a large margin. (explain)

GeForce GTS 250 1GB 11808 Mpixels/sec
Radeon HD 4650 1GB 4800 Mpixels/sec
Difference: 7008 (146%)

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 250 1GB

Amazon.com

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Radeon HD 4650 1GB

Amazon.com

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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 250 1GB Radeon HD 4650 1GB
Manufacturer nVidia AMD
Year March 3, 2009 Sep 10, 2008
Code Name G92a/b RV730 PRO
Memory 1024 MB 1024 MB
Core Speed 738 MHz 600 MHz
Memory Speed 2200 MHz 1400 MHz
Power (Max TDP) 145 watts 55 watts
Bandwidth 70400 MB/sec 22400 MB/sec
Texel Rate 47232 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 128 320(64x5)
Texture Mapping Units 64 32
Render Output Units 16 8
Bus Type GDDR3 GDDR3
Bus Width 256-bit 128-bit
Fab Process 65/55 nm 55 nm
Transistors 754 million 514 million
Bus PCIe x16 2.0 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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

Display Prices

Hide Prices

GeForce GTS 250 1GB

Amazon.com

Check prices at:

Radeon HD 4650 1GB

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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