As far as overclocking I was much more extreme years ago. I even used to have a phase change setup, I always looked for specific stepping numbers for my Opteron chips, compared multiple CPU stepping numbers swapping them in and out etc. This was in the days of AMD dominating over the Intel Pentium mainly because of architecture and AMD had an on-board memory controller. Still those old Pentium EE overclocks into the 5-6Ghz range seemed amazing too.

Specifically on topic - I am not having a problem with the two ASUS TITANS. They are rated stock at 876Mhz. They run fine for a couple hours of gaming at around 990Mhz~1.0Ghz. I do have to turn the power percentage target and fan speed up in the ASUS utility to maintain this.

My cards are NOT downclocking themselves from those levels. I have checked this carefully after reading reports here and elsewhere.

So I have tuned them in around 970Mhz for 24/7, with a quieter fan speed. That is still over 10% increase on reference ASUS cards.

Does anyone have any info on driver optimization for TITAN surround SLI? This is really the issue IMHO - I have tested one card vs. both and they do not scale up nearly as well in SLI as should be possible. I think there is a lot of optimization room in TITAN SLI performance just based on my past experiences of SLI scaling and if NVIDIA will address this we will see some big bumps in performance with multi-card setups in the future.