How do I do that Tom?

I use a free tool for that called GPU-Z, from TechPowerUp.
Tom

You can try and re-seat the card in the slot?

My graphics card was acting up and found the motherboard slot went bad and by moving the card to the 2nd SLI worked.

OK, I've installed updated 334.89 drivers, and GPU-Z. GPU-Z shows a normal temp of about 50C. When rendering this rose to about 56C. On a short Multicam edit though it rose to 61C. There were no crashes though. Are these normal temps?

Those temps seems to be in the same range as mine. I have an old GeForce 9800GT card in the system.
Tom

Perfectly normal temps, I had two GTX570s. Gamers will run those cards in the mid to high 80s for hours. I have been for a long time on driver 296.10 but about 4 month back had some issues after a Windows update and switched to 334.89 with my OpenCL memory tweak and that works very well. Also the 360xx driver works very well and is slightly faster.

Yes, I've also done that memory tweak OS to 1024. Overheating isn't the issue then.

Not fixed. Latest multicam project, crash, crash, crash. Turn off GPU. 100% reliability. Weird thing is, the preview is still as smooth!

[I]"Turn off GPU. 100% reliability."[/I]

Why anyone would turn GPU on escapes me.
SCS should change Vegas so it's Off by default, that'd save Support a lot of work I think.

[I]"Weird thing is, the preview is still as smooth! "[/I]

What's weird about that?
The only thing I use the GPU for is when working with vector graphics, I'm not a gamer so that's limited to the times I play around with 3D apps and CAD. Even there it's recommended to not use the GPU for final renders as the quality is not as good as CPU Only.

Bob.

Oh, another GPU hater.
I never had issues with the 2x GTX570s I had previously in my system, nor with the 2x GTX580s after that or the current 2x R9 290.
But I do agree that GPU acceleration should be off by default as too many users don't have the right hardware for it anyways.
I also don't see any noticeable difference between GPU or CPU rendered videos but I don't really render at bit rates below 6500; if anything lower I used HB and of late frameserve to HB if I need something for the Internet.
I would rather say that the issue is with the GTX770 not being fully supported hence there isn't much difference between ON or OFF. Does this happen with a particular multicam project or any?

I also pulled my GPU long ago. The GPU in my 4770k provides Best/Half preview at full framerate for pretty much anything I do and the GPU doesn't assist when I frameserve>render so for me there was no point in dealing with the instability since the "return on investment" was so low. Now if the HD4600 in the 4770k didn't work with Vegas that might be another story and I'd still be struggling with it. My younger self would still be trying to make it work "just because." But my older, wiser self just moved on and is getting work done...

No, it's all multicam projects. I'll repeat though; It's been flawless for almost a year now on everything, inc multicam.

Possibly failing capacitors.

Bob.

NOW you've worried me Bob! ;-( A google on that produces this set of 'clues':

Difficulty turning on your computer, frequently having to hit reset or restart
Instabilities (hangs, seeing the “Blue Screen of Death,” etc.), especially when the symptoms get progressively more frequent over time
Memory errors, especially ones that get more frequent with time
Spontaneous reboots
In case of on-board video cards, unstable image in some video modes
Failing to complete the POST (Power-On Self-Test) or rebooting before completion
Never starting the POST; fans spin but the system appears dead
Power system malfunctions, fluctuations in system voltage, possibly with an increase in CPU temperature as the core voltage rises
In the case of Dell Optiplex GX270s, often a “Thermal Event” is brandished in white on a very dark computer display when rebooting

I'm not suffering any of those. All completely normal...apart from this multicam thing.

Electrolytic capacitors are one of the few electronic components that can degrade over time. As they lose the ability to do their job the symptoms are highly varied, after all they're in every part of electronic devices. Typically though the problem will start to show up when the computer is working hard unless of course it's say the capacitors in the power supply that have simply blown up, then probably the PC will not boot. You'll usually know If that happened due to the really bad smell.
From the guys that are into the "recapping" thing around 80% of the electronics that ends up on the kerb is there because of capacitors going bad.

The other thing that can cause weird sudden onset problems is connectors, try reseating [I]everything[/I]. A few years ago my DVD duplicator seemed to have two drives fail. The local agent was happy to sell me new drives but was pretty sure the problem would be fixed by reseating all the ribbon cables and he was right.

Bob.