Get the one that is cheaper! But make sure in either case to underclock your memory (VRAM) to 300 MHz or lower. This will make a noticeable difference in the cards overall power consumption (20-40W typically. for me it shaved off 40W!)
Topic: 2G or 1G Radeon HD 5870. (Read 1354 times)
No difference in performance for hashing, some difference in performance on games, particularly at higher resolutions and higher AA.
And in performance?
No.
And in performance?
Is there any difference?
Yes. 1G will draw a bit less power. 
Is there any difference?
Jump to: