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Differences What are the advantages of each

Front view of Radeon HD 7770

Reasons to consider the
AMD Radeon HD 7770

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Significantly higher clock speed 1,000 MHz vs 810 MHz Around 25% higher clock speed
Higher effective memory clock speed 4,500 MHz vs 3,200 MHz More than 40% higher effective memory clock speed
Better floating-point performance 1,280 GFLOPS vs 311 GFLOPS More than 4x better floating-point performance
Higher pixel rate 16 GPixel/s vs 3.24 GPixel/s Around 5x higher pixel rate
Higher texture rate 40 GTexel/s vs 13 GTexel/s More than 3x higher texture rate
More render output processors 16 vs 4 12 more render output processors
Significantly higher memory clock speed 1,125 MHz vs 800 MHz More than 40% higher memory clock speed
More shading units 640 vs 96 544 more shading units
More texture mapping units 40 vs 16 24 more texture mapping units
Front view of GeForce GT 630

Reasons to consider the
EVGA GeForce GT 630

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Slightly lower TDP 65W vs 80W Around 20% lower TDP

Features Key features of the Radeon HD 7770  vs GeForce GT 630 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 7770
72 GB/s
GeForce GT 630
51.2 GB/s
It features a 128-bit wide GDDR5 memory interface, with which it communicates with 1 GB of memory.
Radeon HD 7770 | by techPowerUp! (Feb, 2012)

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 7770
16 GPixel/s
GeForce GT 630
3.24 GPixel/s
You may combine up to two HD 7770 cards from any vendor in a multi-GPU CrossFire configuration for higher framerates or better image quality settings.
Radeon HD 7770 | by techPowerUp! (Feb, 2012)

texture rate Speed at which a graphics card can perform texture mapping

Radeon HD 7770
40 GTexel/s
GeForce GT 630
13 GTexel/s
Even though Vapor-X was engineered for high-end cards, the company's exclusive cooling technology can really show its potential on this lower-midrange card.
Radeon HD 7770 | by techPowerUp! (May, 2012)

floating point performance How fast the gpu can crunch numbers

Radeon HD 7770
1,280 GFLOPS
GeForce GT 630
311 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

AMD's Cape Verde graphics processor introduced a new shader architecture, it is also the second GPU to be produced on a 28 nm process at TSMC.
Radeon HD 7770 | by techPowerUp! (May, 2012)

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

Specifications Full list of technical specs

gpu

Radeon HD 7770  vs
GeForce GT 630 
GPU brand AMD Nvidia
GPU name Cape Verde XT GF108
Market Desktop Desktop
Clock speed 1,000 MHz 810 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GT 630 810 MHz 1 GB

raw performance

Shading units 640 96
Texture mapping units 40 16
Render output processors 16 4
Pixel rate 16 GPixel/s 3.24 GPixel/s
Texture rate 40 GTexel/s 13 GTexel/s
Floating-point performance 1,280 GFLOPS 311 GFLOPS

memory

Radeon HD 7770  vs
GeForce GT 630 
Memory clock speed 1,125 MHz 800 MHz
Effective memory clock speed 4,500 MHz 3,200 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 72 GB/s 51.2 GB/s

noise and power

TDP 80W 65W

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