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For example, I know GT640 is better than GT640M.

1.Is GT630 better then GT640M?

2.Is GT620 better then GT640M?

3.Is GT610 better then GT640M?

How to check for their performance if I don't have any card before I want to buy?

Thank you~

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closed as off topic by Web-E, Anwar Shah, jokerdino, Uri Herrera, Amith KK Aug 9 '12 at 8:45

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

Its an off topic. Its not related to ubuntu. Please have a look in FAQ – Web-E Aug 9 '12 at 7:48
check out the for comparisons and benchmarks , also having their own testsuite to do it manually. – atenz Aug 9 '12 at 8:12
up vote 0 down vote accepted

If you don't have the card,

Research through internet. Read reviews and compare the posted benchmarks.

A list is over here -

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