Gigabyte GA-Z68X-UD4-B3, 2 x MSI GTX 970 Gaming 4G in SLI

[droflah]

Hi,

I upgraded to a single MSI GTX 970 Gaming 4G in my Gigabyte GA-Z68X-UD4-B3 motherboard a few years back (From 2 x GTX 560 in SLI).

At the time I had to upgrade to the latest BIOS (UEFI U1E) which also happens to be marked as a 'Beta' BIOS. Anything else resulted in a failure to pass POST, and having checked today, there is no more recent BIOS :/

A few weeks ago I purchased a second identical GTX 970 with a view to going back to SLI, but once again I'm getting failure to pass POST with both cards and the bridge fitted.

The cards work fine when fitted individually, so it doesn't appear to be a faulty card.

I'm beginning to think that maybe it's time to buy a new motherboard but that really means a new processor and RAM at this point and I'm trying to avoid additional expense.

Any help and advice appreciated

 

[Calvin7]

GeForce GTX 970 or 980 in 2-way SLI - On your average system the cards require you to have an 700~800 Watt power supply unit as minimum. GTX 560 in SLI - 650 watts is recommended.

 

[droflah]

GeForce GTX 970 or 980 in 2-way SLI - On your average system the cards require you to have an 700~800 Watt power supply unit as minimum. GTX 560 in SLI - 650 watts is recommended.

Pretty sure the PSU is 1000W but I will check as I may have made that up. Thanks

Edit: Definitely a 1000W PSU.

 

[droflah]

Riiight ok. Thought I'd tried this already, but clearing my CMOS and resetting to defaults seems to have magically cleared the issue.