No auto start scrypts, no clock or voltage adjustments, no gpu clocking utility installed at all.

@TribalBob
Yes, I ran the amd uninstaller and then rebooted in safe mode and ran Display Driver Uninstaller for nvidia/amd. I've been told by many on this forum that 750-watt psu should be plenty strong to run two 290xs. 
I also summed it was under warranty but Gigabyte told me that it wasn't even though I purchased it less then 30 days ago, how screwy is that. So I have an RMA from them, but then wanted to get SuperBiiz from who I purchased it from to replace or refund it, but they won't respond to me and they have a 30-day policy and I'd have to overnight ship it today to get it there tomorrow, but I have no RMA from them. Drr

@hashmen
Sapphire TOXIC AMD Radeon R9 280X 3GB  cost $515
Sapphire TRI-X AMD Radeon R9 290X OC 4GB costs $740

Not at all twice the cost.  Configmyrig.com says the 280x gets 600 kh/s and the 290x gets 800 kh/s.
Litecoin info has high values contrasting from 770Kh/s vs 1002Kh/s.

So basically you are incorrect in both statements.

I've never trusted the stuff people post to that site.  None of those values worked on my Gigabyte R9 290x.

How much of a hash rate difference are there between these two cards?
Sapphire TRI-X R9 290 OC 4GB
Sapphire TRI-X R9 290X OC 4GB

I had a Gigabyte R9 290x OC4GB that I was only getting around 840Kh/s with and then it went dead.  So if I get a full refund on it then I'd like to stay away from Gigabyte this next time.

Asus M4A87TD EVO AMD870
AMD Phenom II X6 1090T Processor 3.2
Corsair Enthusiast Series 750-Watt 80 Plus Bronze Certified PSU.  Single chain - yes, I have both the 6 pin and 8 pin connectors plugged in.
Corsair 16gb XMS3 PC3-1333 DDR3 Ram
Evga GeForce GT 430 1 GB DDR3 (old GPU that is working)

Now that all my 290x drivers/catalyst are uninstalled. I wonder if I should install the latest 14.1 beta catalyst and then put the 290x in again and try it. Or is that a no no to install first?

I have a GIGABYTE AMD Radeon R9 290X OC 4GB GDDR5 (model: GA-R929XOC)

All the latest drivers were installed a week ago.  The display was working except for that it would crash to a black screen about every other day. A hard reboot would get things going again. Then a couple days ago the computer froze to the desktop screen.  I hard rebooted and then no screen came back. It was just a black screen with no boot screen or desktop. I could hear windows loading and could connect with a remote connection to see a black desktop with white cursor. I put in a different gpu and windows and my hard drives loaded again.  I uninstalled the drivers/catalyst and restarted and tried with 290x again and still no difference. I even tried running Display Driver Uninstaller in safe mode with my old gpu and still the 290x boots with a black screen.  I created support tickets a few days ago with AMD and Gigabyte, but have not heard back from either.  Any thoughts on what to try?  Thanks!

Reinstalling my OS at this time is not an option. Any other advice on how to get my 290x working again?

So my computer crashes a lot now since mining.  The screen will go black and I'll have to hard reset.  Last night the computer just froze with the desktop screen showing.  I did a hard reset, ... then the computer doesn't turn back on.  Gpu fans are still spinning and lights come on from the computer. I take my r9 290x out and put my old radeon back in and it boots up.  Before trying my 290x again should I uninstall all the drivers and catalyst for it??

Thread Concurrency:
8192 = 815Kh/s
16384 = 806Kh/s
24576 = 825Kh/s
32768 = GPU Failure

@SheepOnDrugs   Thanks, I will give that a try.
@mrmork666    Thanks for the links, but I've tried every single setting from those two sites already and they all ended up with a lower has then what I was getting.

Same exact speed with -g 2
What thread-concurrency do you recommend I lower it to?

Ya, I've played with gpu engine clock and memclock a whole lot and this was the best I could get.  My HW is 0 and WU: 795/m.

I've now got it set up with a .conf file and running kalroth's 3.7.2 cgminer and can't get as high of a hash as I was getting before without the xintensity.  I think my card has 2816 shaders so the xintensity would be 372?

I've tried about a dozen other higher GPU engine values higher and they all resulted in a lower hash by about 100-150Kh/s lower.
What GPU engine value do you recommend I try? I've never heard of xintensity, I will definitely look into it.  As a side note. I've never noticed any difference at all in performance with the following included:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
Am I doing something wrong with the above code?

Is there anyway of getting a higher hash?

My Gigabyte R9 290X is getting 863Kh/s with WU:780/m and 79C

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -o stratum+tcp://scrypt.megamultipool.com:80 -u user.user -p password --intensity 20 -g 1 -w 256 --lookup-gap 2 --thread-concurrency 24550 --gpu-engine 920 --auto-fan --gpu-memclock 1500 --gpu-powertune 20 --temp-target 80 --temp-cutoff 95 --temp-overheat 92

By chance is your pc connected to a battery backup? Plug it into a normal surge protector.

My Gigabyte R9 290X is getting 863Kh/s with WU:780/m and 79C

setx GPU_MAX_ALLOC_PERCENT 100
cgminer --scrypt -o stratum+tcp://scrypt.megamultipool.com:80 -u user.user -p password --intensity 20 -g 1 -w 256 --lookup-gap 2 --thread-concurrency 24550 --gpu-engine 920 --auto-fan --gpu-memclock 1500 --gpu-powertune 20 --temp-target 80 --temp-cutoff 95 --temp-overheat 92

@pontiacg5  If you have a better setting for me to use then I'm I'll ears.  This is my card ...
GIGABYTE AMD Radeon R9 290X OC 4GB GDDR5 2DVI/HDMI/DisplayPort PCI-Express Video Card

@mrmork666    Thanks again for your help.  I've got an AMD Phenom II X6 1090T Processor 3.2 on a Asus M4A87TD EVO AMD870 mobo with 16gb ram.  Still sounds like it shouldn't be a problem to run just one gpu.  I'll being testing again without the battery backup and with your settings as soon as I get home from work!