2 Gigs ram working but not 6

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1 269.998046 MB EVGA 132-BL-E758-TR X58 3SLI

So heres the deal I am using 3 two gig sticks of DDR3 ram on my computer. I just built this computer 2 weeks ago and from day one its been acting kinda funky. It randomly blue screens when I do something labor intensive. Once it booted in a cycle and failed to boot the next day. But more recently it doesnt seem to run at the speed of a computer that should be running with 6 Gigs of ram. So i figure my ram is bad. So I ran a ram test and and it finds about 23 errors. So I ran a test on each individual ram stickin order to find which ram stick is bad and it does not find an error on any one chip alone. So I figured maybe a memory slot on my mother board is broken so I tried one stick in each of the slots and each test found no errors. So then I tried 2 sticks for 4 gigs and the test doesnt even run it just freezes.

So the question is, why would each stick work fine on its own, but when working together they achieve 23 errors or just freeze the memory test?

*my hardware above*

Just my 2 cents worth. Are you using Vista or XP PRO-64 for your operating system. If Vista, is it Home, Premium or Ultimate. Your problem sounds like you did not read the manual before you assembled your system. There is a very specific order in which the dimm slots have to be populated onyour motherboard inorder for it to work properly. Since you are still using the stock Intell cooling fan and your post does not make it clear if you are over clocking you could also have a thermal problem too. download real temp and cpuz and check system settings and post the results

^ Would be my first suggestion as well, more sticks can mean more system overhead, do crocs suggestion and SLOWLY and VERY INCREMENTALLY .01 at a time increase the voltage and see if it stables up. Don't go over about .05.
Of course, the first thing to check is see if it is running at it's rated voltage in the first place, sometimes the board will not set it correctly.
If it won't run steady at that (after bumping it up a little), time to return it.

1.75 is a bit high, yes. It won't run at any voltage below that? You could try relaxing the timings a bit...

Check for a BIOS update as well.