Please Help - Bad Nvidia build experience - need advice

After 5 months of patiently waiting and saving I bought the following parts for my build:

nvidia 790i
2 9800 gtx sli
soundblaster x-fi 150 buck card
expensive dd2 3 ram
q9450

After I put everything together and flashed to the newest bios what a stinkin nightmare it has been. When I start a game It randomly freezes about 5 minutes into the game. When I disable sli it freezes at about 15 minutes. I called EVGA "best technical support my bottom" told me to defrag my hardrive. Sad indeed - what a moron. Anyhow I have nothing overclocked and I just want a stinkin computer that works. I have come to a few conclusions. SLI is overated and buggy. I officially will never buy another soundblaster again. Crackles and pops are UNACCEPTABLE for a 150 buck card. Sucky drivers. Last but now NVIDIA cant make motherboards worth a poo. They should stick to graphic cards and do us all a favor.

Please help suggest a motherboard for me. I want it to be able to run my penryn q 9450 out of box use ddr2 ram and be an Intel Chipset. I had my eye on a couple of x38/x48 boards but they are made by ASUS. I have heard bad stuff about them and I think If I get another unstable motherboard I am gonna scream. I am also forgetting about a soundcard. If I want snap crackle and pop I will by rice crispies. And I do realize I will lose a 9800 gtx since intel doesnt support sli, but I think I will survive.

Has anyone had great luck with a board that is quality and good for noobs that don't care about overclocking? I just want to play my games Please help. Much thanks in advance

Tbh it sounds like an overheating or power supply problem, what power supply do you have? What are the temps of your video card(s) during games? It may not be necessary to buy another motherboard.

I have had good luck with Asus & Intel Chipsets MBs.

I felt their MBs might have better manuf quality and the stackcool might be worthwhile.

The X48 was the first one that I was concerned about. It has so many heatpipes and fins there can be clearance issues even if the cooler says it is compatible -- fins near the cpu and voltage regs should be at least 1-2mm shorter.

The heat sinks seemed very hot (painful) hot at first. I noticed the CPU and NB and SB voltages read high so I lowered them to what I thought was a touch above normal. Weeks later, it seems cooler -- I dont know if lowering the voltages did it or if the heatsinks and thermal interface material settled in.

Buy a cooler with a backplate -- it helps keep the stress off that multilayer fiberglass board.

I know XFi worked well on older intel chipsets with Windows XP. Games can stutter when they dont feed/update status often enough -- normally this only occurs infrequently or with a new game in need of more development time. UT3 can have some problems in OpenAl mode -- this is unusual. Most games work.

Usually for creative, I install the creative CD (after chipset update) with the stuff I want and then I update the driver (maybe/sometimes I uninstall only the driver first). Select game mode, turn off crystalizer but leave the 3d mode on (for games) on -- with EAX and EQ on but none/neutral. Sometimes it seems directx doesnt install fully before the soundcard and video drivers are installed, so I install directx, add drivers, and then install directx again. I go for the latest full redist for a build.

Interesting tool

http://www.thesycon.de/deu/latency_check.shtml

but use at own risk