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I have one computer with windows 8.1 13.11 driver and a 280x which gets 720KHS and another computer with the same setup which gets 620KHS.

They have a different cpu ram and psu (both have quality ones).

How can this be?

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I have one computer with windows 8.1 13.11 driver and a 280x which gets 720KHS and another computer with the same setup which gets 620KHS.

They have a different cpu ram and psu (both have quality ones).

How can this be?

It's because they have a different ram. With scrypt mining RAM is of up most importance. The faster/higher quality the ram, the faster you can mine.

Scrypt was made to require ram so it would slow down the over all hashing power and to resist asics.

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    as far as I know, Cgminer uses the gpu ram. and i had on that computer win7 and it mined at 707 KHS but i had no temps or fan speed and could not overclock. – Amit Raz Jan 10 '14 at 11:22
  • So I have Reinstalled the 13.12 driver and not I am at 718KHS which is good enough :) – Amit Raz Jan 10 '14 at 12:53

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