GPU's with 1GB or 2GB

[karapet]

HI all,
quick question. What purpose those GBs serve in videocards? Why one with 2GB is better than 1GB (besides that it's obvious).
Exmple:
EVGA 02G-P3-1568-KR GeForce GTX 560 Ti (Fermi) 2GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
Newegg.com - EVGA 02G-P3-1568-KR GeForce GTX 560 Ti (Fermi) 2GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

and

EVGA 01G-P3-1561-AR GeForce GTX 560 Ti FPB (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
Newegg.com - EVGA 01G-P3-1561-AR GeForce GTX 560 Ti FPB (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Thank you

[jdeb]

The GPU memory serves the same purpose as the RAM on computers. The work of the memory is to keep the data to be processed by the GPU as per the instructions received from the CPU. The memory is also used for the acceleration of polygon rendering, geometric calculations, texture mapping, interpolation, antialiasing and managing color spaces to name a few.

Deciphering Hardware Specifications - Graphics Cards

[karapet]

Originally Posted by jdeb The GPU memory serves the same purpose as the RAM on computers. The work of the memory is to keep the data to be processed by the GPU as per the instructions received from the CPU. The memory is also used for the acceleration of polygon rendering, geometric calculations, texture mapping, interpolation, antialiasing and managing color spaces to name a few. Deciphering Hardware Specifications - Graphics Cards

Hey jdeb, I appreciate very much that link you gave me above. very helpful, still reading about all hardware. Hopefuly I will ask less stupid questions in the future.

Thanks