The best replacement for 1gb is 2gb.

The best alternatives to 1gb are rated as following:
★★★★★  2gb
★★★★  2gb ram
★★★  2gb video card
★★★  2gb vram
★★  512mb
★★  1gb
★★  2gb gpu
★★  1mb
★  500mb
★  2gb graphics card
★  2gb 7850
★  512mb graphics card
★  100mb
★  10gb ethernet
★  4gb ram
★  2gb gddr5
★  2gb memory
★  10gb iscsi
★  1tb
★  1.5gb
  256mb
  10gb
  2x512
  2gb 650m
  2gb 6950
  unlimited data
  mb
  100 mb
  2gb 560 ti
  7 cruz(tm) 2gb
  1024mb
  512mb video card
  2 2gb
  2 512mb
  768mb
  512 video card
  2gb of ram
  512 mb
  2gb card
  1 mb
  1kb

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Speaking about 1gb, one probably shouldn't forget about 2gb.

Other search terms related to 1gb and their ratings are:
★★★★★ 2gb
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Google Trends

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1gb
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