Does it matter if my rams are different speeds

[punsted]

i just installed a new gtx260 gpu, 4bg ram,500gb sata HD,750w power supply and sometimes when playing games all of a sudden the screen goes blank and it says (no signal) and the cpu fan speeds up?
i then have to restart the pc.i have installed all drivers and the only one issue i can think of is my ram are not the same speeds one is 555 and the other is 666 i think. but i cant see this being the problem,
if anyone has had a simular problem please advise?
thank you

 

[djcoolmasterx]

RAM should run at the speed of the slowest stick so mismatched speeds are generally not an issue.

 

[jsc]

Yes. Set your memory speed to the slowest stick. Then, if you still have problems, increase the RAM volt .1 volts. If you still have problems, drop the timings some more - go from 5-5-5-15 to 6-6-6-18 for example.

If you STILL have problems, buy some matching memory.

 

[Aneesh@4GHz]

Dont use rams with different speeds,Use the ram with higher speed!

 

[djcoolmasterx]

Dont use rams with different speeds,Use the ram with higher speed!

Alot of the time more RAM running slightly slower is better then less RAM running slightly faster.

 

[tinker1]

IK NOT A PRO IT THIS but with very spendy trials i have made my mind up to do what it calls for run natching speed ram dont make the pc try to figure out any more then it has to