Odd freezing, gfx memory?

[-Neil-]

Built the following system yesterday and I've been having some weird lockups/freezing.

Phenom 9850
Asus M3A78 (780G Board)
GeIL 4GB (2x2GB) PC2-6400C5 800MHz Black Dragon DDR2 Dual Channel Kit
2X Samsung 1TB Drives
Pioneer BDC-202BK
Akasa Ultra Quiet 500W PSU
Vista x64 SP1 OEM

Everything is at stock as far as I'm aware.

Basically what happens is I'm watching a dvd/bluray disc or any video and after a random amount of time the screen will turn a dark colour with faint coloured lines running up the screen, a reboot is needed to get going again. It has happened when just browsing the web.

I've ran the following with no errors:

Memtest for 7 hours.
Video Memory Stress Test.
Prime 95.

I've also removed the graphics drivers with driver sweeper and reinstalled just the latest Ati display driver to no avail.

My gut tells me it's the onboard graphics memory that's borked, but doesn't this board use the ram as gfx memory? Odd that memtest has thrown up no errors.

Temps are ok from what I can see, currently sitting at 44 degress C on the cpu.

Any ideas before I contact OcUK for an rma number?

Neil.

 

[-Neil-]

Looking at this page here:

http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us&model=M3A78-EMH HDMI

It appears the 9850 isn't supported by this board

Will underclock the cpu and run a video and see what happens

Neil.

 

[fobose]

A quote from a competitor website:

The vast majority of the 780G boards have a three-phase or four-phase PWM circuitry design. These designs are completely acceptable for the 45W, 65W, 89W, and 95W TDP rated processors; however, drop in a 125W TDP processor such as the Phenom 9850e or 6400+ X2 and you are asking for trouble.

I think I read it on a review too?

 

[-Neil-]

Just submitted a webnote to OcUK, will update this thread as I go on.

Neil.