AMD FSB help

High Performance GPU clock settings:600 out of 850mhz
High Performance memory clock settings:1000 out of 1200MHz
Enable manual fan control (dint tick manual) 20 out of 100 where it shows MHz its showing 50%

cpu power
3000MHz out of 3000MHz

cpu overfrive is disabled
AMD overdrive is enabled

Details
Card name: AMD Radeon HD 6800 Series
Chip type: AMD Radeon Graphics Processor (0x6739)
Operating System: Windows 7 Ultimate 64-bit
BIOS: Award Modular BIOS v6.00PG
Processor: AMD Phenom(tm) II X4 940 Processor (4 CPUs), ~3.0GHz
Memory: 4096MB RAM

when I play a certain game the temperature hits to 60-70 degree what I wanna know is if it will be safe to do a FSB overclock and if yes then to what limit would it be also I got no special cooler on it so can tips be given to control temperature as much low as possible thx ^^
 
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