Speed Problem

[imeicodes]

I have Problem with Calculation Speed 7200M/s But i see here Many People have 8000 m/s + Speed Plz Help me

I Use Two Card ATI Radeon 6990

[s]tatus [p]ause [r]esume [q]uit =>s
Status.......: Running
Hash.Type....: SL3
Time.Running.: 1 Hour, 20 Mins
Time.Left....: 1 Day, 9 Hours
Plain.Text...: ********0004000501060801090401
Plain.Length.: 15
Speed........: 7246.2M/s
Progress.....: 149178333265920/1000000000000000 (14.85%)
HW.Monitor.#1: 99% GPU, 86c Temp
HW.Monitor.#2: 94% GPU, 75c Temp
HW.Monitor.#3: 94% GPU, 75c Temp
HW.Monitor.#4: 94% GPU, 76c Temp