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Radeon HD 3870 1GB vs Radeon HD 7750

Intro

The Radeon HD 3870 1GB features clock speeds of 775 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR4 memory. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7750, which features clock speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 512 SPUs along with 32 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 51 Watts (93%)

Memory Bandwidth

Both cards have the exact same bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon HD 7750 is a lot (about 106%) faster with regards to AF than the Radeon HD 3870 1GB. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 13200 (106%)

Pixel Rate

The Radeon HD 7750 should be a bit (approximately 3%) more effective at full screen anti-aliasing than the Radeon HD 3870 1GB, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 3870 1GB 12400 Mpixels/sec
Difference: 400 (3%)

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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Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 7750

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 Radeon HD 3870 1GB Radeon HD 7750
Manufacturer AMD AMD
Year Nov 19, 2007 February 2012
Code Name RV670 XT Cape Verde Pro
Memory 1024 MB 1024 MB
Core Speed 775 MHz 800 MHz
Memory Speed 2250 MHz 4500 MHz
Power (Max TDP) 106 watts 55 watts
Bandwidth 72000 MB/sec 72000 MB/sec
Texel Rate 12400 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 320(64x5) 512
Texture Mapping Units 16 32
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million 1500 million
Bus PCIe 2.0 x16/AGP 8x PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total amount of 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 applied in a second.

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

Display Prices

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Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 7750

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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