Can I use A4983 and motor with working current 2.5A???

BotMill sells stepper motors for good price . But i`m not sure i can use them with Quadstepper (with A4983 - limit 2 amp).
If i give less current to motor (1.2-1.5A) will it work good (enough torque) for RepRap.
motor (42BYGHW811 NEMA-17 Bipolar 4-wire Step angle: 1.8° Holding Torque: 4800g-cm @ 2.5 Amps)
or i have to give it 2 amp and use heat sink???
or better to look for SM42HT47-1684MB Torque: 4400g-cm @ 1.68 Amps ???

The second one is significantly better. You will get way less than rated torque driving the first one with an A4983.

Kliment

Thank you! Do you know who is selling this motors (SM42HT47-1684M?

Under-driving the first motor isn't really a big deal.

The motor torque and current are approximately proportional, so running the 2.5A motor at 1.25A, you still have 2400g-cm of torque which is plenty for a reprap. Also, this will make the motor run a lot cooler.