has anyone been able to get afterburner to start when they install 4 identical 6870 cards?

CCC will control all 4 cards, all 4 cards work about the same when mining but when all 4 are installed afterburner wont launch.  3, 2 and 1 cards it works fine.

i get an error that says ""failed to initialize display driver wrapper."

i have reinstalled drivers, reinstalled afterburner (regular and beta), reinstalled the operating system, did some registry edits that supposedly worked for someone else with the same problem that didn't work, run the cards in crossfire (2 x2 crossfired, and one crossfired with 2 individual cards), 3 cards have dummy plugs, 4th plugged into monitor.

trying to overclock the cards a bit more than is possible with CCC.  I have tried Trixx but it only changes one of the 4 cards even though i have the box checked to apply to all cards.  all 4 cards are identical, brand, manufacturer, and bought at the same time.

running 2 cards on extenders and 2 cards plugged into the motherboard.  the whole box pulls 630 watts and it has a 850w gold power supply.

what happened in march of 2011?  there is a big spike in the hashing power then a dropoff then a difficulty decrease.

when were graphics card miners written?

when were pools created?

on the really short rounds you can really make some coin when you get a ton of shares in within 2-3 min.

is there any GUI miner for linux?

i am trying to get linuxcoin to work and i keep getting this error when i try to start a miner from the command line.

Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.6/threading.py", line 484, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/opt/miners/poclbm/BitcoinMiner.py", line 272, in miningThread
    self.loadKernel()
  File "/opt/miners/poclbm/BitcoinMiner.py", line 373, in loadKernel
    binaryW = open(cacheName, 'wb')
IOError: [Errno 13] Permission denied: 'a1e83b97617e24d438cfc4107fb4f147.elf'

the rest of it seems to be working great, i just cant get the miners to start.

i want to get these graphics cards out of my main machine into a mining rig and put this together will an 850w PSU be ok?

i have these already
3x  6870 xfx GPU

this is what i was going to buy
ASRock 870 EXTREME3
OCZ ZX Series 850W Fully-Modular 80PLUS Gold
2x     Kingston 1GB 240-Pin DDR3 SDRAM DDR3 1066
AMD Sempron 140 Sargas 2.7GHz
Seagate Barracuda 500GB

putting it all in a ghetto aluminum rack, ordered 2 pci extenders so i can space the cards apart and keep them cool

what kind of PSU would i need if i were to add a 4th card in the same range as the 6870's that i have already?