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As for Turbo Boost, it's my understanding that this feature Automatically engages as needed.
The FX6800 should be able to hold up to 24 GB of memory which is something that is not reported in the specifications. 4GB per memory slot total.
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As for how much physical memory you can run, it depends entirely on what Operating system you run.
Memory Limits for Windows Releases
Vista Ultimate - - - - - 32-bit = 4 GB - - - 64-bit = 128 GB
Vista Enterprise - - - - 32-bit = 4 GB - - - 64-bit = 128 GB
Vista Business - - - - - 32-bit = 4 GB - - - 64-bit = 128 GB
Vista Home Premium - - 32-bit = 4 GB - - - 64-bit = 16 GB
Vista Home Basic - -- - 32-bit = 4 GB - - - 64-bit = 8 GB
Vista Starter - - - - - - 32-bit = 1 GB - - - 64-bit = N/A
I just recently upgraded the memory in my system to 12GB CORSAIR HX3X12G1333C9 for $235.00 with no problems.
If you should decide to upgrade your memory, I would recommend first going into the system BIOS and Enable
Clear nVRAM, then use F-10 to save and exit the BIOS. Next, shutdown the system, unplug the power cord, then hold the power button in for a few seconds to drain any remaining power from the system.
Make sure you have an Anti-Static wrist strap before handling the memory as you don't want to risk damaging the memory with static electricity. You can pick one up at Best Buy or possibly some other computer store.
After you put on the wrist strap and connect it to a bare metal part of the case and you make sure you have discharged any static to an existing ground near you, proceed to lay out your new memory sticks, then carefully release and pull the old sticks from the system. You may want to cut one of the cable ties on the wire harness so you can move it out of your way first.
Next, start with the socket closest to the processor and insert the sticks one at a time in the slots, making sure they are lined up properly. Press them in carefully while applying more pressure to the lower end of the stick, then when the lock tab flips up, shift the pressure to the other end to close the other lock tab. Do this for each of the memory sticks. Then using a flat headed screw driver, carefully check to make sure each tab is fully locked in place. - Careful not to apply so much pressure that you accidentally damage the motherboard when pressing in the memory sticks.
After you have finished, plug the system back in, then power it up.
It should boot normally, in which case just go into the BIOS and un-check the Clear nVRAM setting, verify all your settings, then hit F-10 to save and exit.
Should the screen stay dark and after a little while you get a long continuous beep, you should hold the power button in till the system shuts down (about 10 seconds), then restart the system and it should start normally. You will still need to go into the BIOS to save the new memory configuration.