but am open to other views and opinions to see from another angle.
More efficiency means less heat and thus can result in less noise. And since a 350-400W PSU is going to be running closer to it's 100% load than the 50% load with a high-end GPU, it's going to be as efficient as an 800W Gold PSU.
There are more GPUs than just the GTX 1080, like the "GTX 1080 Ti" that is undoubtibly going to launch after the "New GTX Titan" launches which will both probably use more than 180W. We're also not sure what AMD has planned for us soon and early 2017. You think it's strange that SFX PSUs are used for SLI/Crossfire or overclocked setups ? Aibohphobia already tested the 700W SFX-L PSU with an Intel X99 and GTX 980 SLI setup.Well, you have a 140W LGA 2011 CPU and a 180W GPU for 320W and 30W for other assorted bits and pieces, you want the PSU at 50%, that's 700W. What's 800W for? Are you going to run GTX 1080 SLI off an SFX PSU?
Having said all this, Phuncz' table demonstrates some really good advice: You should always aim for a PSU that will be running at 50% efficiency at load. That's going to have the biggest effect on heat and power usage.
I partially disagree. You should aim for a PSU that will handle your maximum load, but also with attention paid towards the load that you run MOST of the time.
Example: Someone in college who spends 2 hours a day gaming (running under load) but the rest of the time web browsing or typing papers, plus leaves computer on 24/7 because reasons. A modern gaming computer without power management disabled can easily be under 10% load on some of these high powered units for 22 hours a day.
That said, at least Titanium rating requires the units to pass a 10% load. Also, a counterargument can be that a 10% efficiency difference at low loads may account for 5-10W while the same percentage difference at high loads can be 50-60W.
Thanks for the update Tony! Just in time for Xmas... although I wonder how good supplies will be at first?
That is incredibly unfortunate. I thought perhaps that there would be no need for a bigger sfx-l psu.
Do you think its something you can eliminate by keeping the cards from boosting? Not that that would be ideal.
It may be worth contacting Silverstone: Even at absolute peak momentary draw the Titan X(p)s draw 250W each (500W total), so the remaining 300W should be more than enough for the Xeon + mobo. It could possibly be a current slew rate issue, but that would be a "hey Silverstone, Y U no hit ATX spec?!" problem, a single Titan X(p) is well within the 50% rated current transient spec.Just a heads up everyone. I finally got my hands on the 800w SFX silverstone and it cannot power dual Titan Xps + a mini-tx motherboard running 2699V4. It can drive a single Titan Xp + mobo but as soon as I kick up the other GPU, the system reboots. I am able to run them using two PSU with a PSU splitter without any issues so it's definitely a PSU issue. The same thing happens with the single Lian Li 750W SFX PSU. I thought the 50W would make a difference so picked up the 800W Silverstone but it's a no go unfortunately.
As a heads up to those of you interested in using the SX800-LTI in our SFX cases, please make sure to check out the short compatibility list we posted over the weekend, below is a copy:
Model - Compatibility
RVZ01 / FTZ01 / ML07 - No
RVZ02 / ML08 - Yes
SG05 / SG05-450 / SG05-LITE - No
SG06 / SG06-450 / SG06-LITE - No
FT03-MINI - No
ML05 / ML06 / ML06-E / ML09 - No
DS380 - No
CS01 / CS01-HS - No
CS280 - No
PP08 - Yes
The incompatibility is due to SX800-LTI's power cord connector interfering with case's PSU cutout. We are currently working on widening the cutouts on incompatible cases so hopefully this list will show more "yes" than "no" by the middle of next year.