Cast your vote Do you agree or disagree with GPUBoss?

Thanks for adding your opinion. Follow us on Facebook to stay up to date with the latest news!

Differences What are the advantages of each

Front view of Radeon HD 4890

Reasons to consider the
XFX Radeon HD 4890

Report a correction
Higher clock speed 1,000 MHz vs 771 MHz Around 30% higher clock speed
Front view of GeForce GTX 780M Mac

Reasons to consider the
Nvidia GeForce GTX 780M Mac

Report a correction
More memory 4,096 MB vs 1,024 MB 4x more memory
Higher effective memory clock speed 5,000 MHz vs 4,000 MHz 25% higher effective memory clock speed
Significantly more texture mapping units 128 vs 40 88 more texture mapping units
Higher texture rate 98.7 GTexel/s vs 40 GTexel/s Around 2.5x higher texture rate
Higher memory bandwidth 160 GB/s vs 128 GB/s 25% higher memory bandwidth
Slightly better floating-point performance 2,368.5 GFLOPS vs 1,600 GFLOPS Around 50% better floating-point performance
More render output processors 32 vs 16 Twice as many render output processors
More shading units 1,536 vs 800 736 more shading units
Slightly higher pixel rate 24.67 GPixel/s vs 16 GPixel/s Around 55% higher pixel rate
Higher memory clock speed 1,250 MHz vs 1,000 MHz 25% higher memory clock speed
Lower TDP 122W vs 190W More than 35% lower TDP

Features Key features of the Radeon HD 4890  vs GeForce GTX 780M Mac 

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

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

Radeon HD 4890
16 GPixel/s
GeForce GTX 780M Mac
24.67 GPixel/s

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

Radeon HD 4890
40 GTexel/s
GeForce GTX 780M Mac
98.7 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4890
1,600 GFLOPS
GeForce GTX 780M Mac
2,368.5 GFLOPS

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

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

Specifications Full list of technical specs


Radeon HD 4890  vs
GeForce GTX 780M Mac 
GPU brand ATI Nvidia
GPU name RV790 GK104
Market Desktop Laptop
Clock speed 1,000 MHz 771 MHz
Is dual GPU No No
Reference card ATi Radeon HD 4890 850 MHz 1 GB None

raw performance

Shading units 800 1,536
Texture mapping units 40 128
Render output processors 16 32
Pixel rate 16 GPixel/s 24.67 GPixel/s
Texture rate 40 GTexel/s 98.7 GTexel/s
Floating-point performance 1,600 GFLOPS 2,368.5 GFLOPS


Radeon HD 4890  vs
GeForce GTX 780M Mac 
Memory clock speed 1,000 MHz 1,250 MHz
Effective memory clock speed 4,000 MHz 5,000 MHz
Memory bus 256 bit 256 bit
Memory 1,024 MB 4,096 MB
Memory type GDDR5 GDDR5
Memory bandwidth 128 GB/s 160 GB/s

noise and power

TDP 190W 122W


comments powered by Disqus