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2020-08-12, 01:53   #342
PhilF

Feb 2005
Colorado

487 Posts

Quote:
 Originally Posted by sdbardwick Nah, you can run those Corsair RMs at 95% load 24/7 for at least 3 years at 35 degrees C; I'd say longer but mine has only been running for 38 months. If his wattmeter is to be believed, he is currently drawing 783W DC, (900W x 87%+ efficiency at full load), or 92% of rated.
Yes, and he's planning on upping it.

That is where math fails me. 92% is close enough to 95% that I don't go there, lol.

2020-08-12, 02:45   #343
ewmayer
2ω=0

Sep 2002
República de California

22·2,857 Posts

Quote:
 Originally Posted by PhilF You make sound like 849.5 watts is "safely within the PSU's 850w limit" lol. If you like that power supply, and want it to live a long, happy life, you won't push it so close to it's limits.
Hey - no guts, no glory, pal. :) But as I noted a few pages back, I did lay in an extra Corsair 850RM, just in case. I like the sub-1000W models both due to their wonderful compactness, but also there's a major price jump in going to the kW-plus models - the 850RM was just $150 including 8.5% CA sales tax. (First one I bought was ~$10 cheaper ... and, I see Amazon is fresh out again, only 2 "in stock" via resellers, starting at the low, low price of \$300).

Quote:
 This is becoming my favorite emote for you, lol:
If I die in a horrific PSU fire, perhaps y'all will be kind enough to rename said emoti-code in my honor.

Alas, the nickname 'Nuke' was already taken by Tim Robbins' character in the (very fine, not like that other silly baseball movie starring Kevin Costner) baseball comedy Bull Durham.

Quote:
 Originally Posted by sdbardwick Nah, you can run those Corsair RMs at 95% load 24/7 for at least 3 years at 35 degrees C; I'd say longer but mine has only been running for 38 months. If his wattmeter is to be believed, he is currently drawing 783W DC, (900W x 87%+ efficiency at full load), or 92% of rated.
Yah, now we got someone after my own heart - if you're gonna buy a PSU rated X watts, it should be able to pump out X watts 24/7 for 3 years or more. Blowing any dust out of it a couple times a year and placing it so its fan doesn't need to work overly hard should be the only TLC it needs.

Last fiddled with by ewmayer on 2020-08-12 at 02:48

 2020-08-12, 02:48 #344 sdbardwick     Aug 2002 North San Diego County 22·132 Posts Whoops! Gotta walk back part of my earlier statement. Friend informs me that he switched jobs a month ago and lost his utilities included situation, so he stopped using the RM850 I loaned him. Still worked fine, but runtime was 37 months. I wouldn't be comfortable running just any PSU so close the max, but the Corsair RM series and higher can actually live up to their ratings. Plus, the ratings are for 50C ambient, so the lower environmental temps give you a bit more headroom.
 2020-08-12, 20:21 #345 ewmayer ∂2ω=0     Sep 2002 República de California 2CA416 Posts Quick update - all yesterday afternoon and evening was running the 4-GPU setup with sclk settings 3,3,3,1, TDP ~900w. Last night occurred to me that - based on previous sclk-fiddling - that using sclk = 3,3,2,2 would boost total throughput while leaving wattage more or less unchanged, did that a few hrs before going to bed, worked as desired. That ran stably overnight, but a few hrs ago tried upping one of those sclk = 2s to 3, that upped TDP to ~950w, but was not stable, the GPU whose clock I upped to 3 got shut down (I'm guessing by rocm?) after aroud an hour, and resetting it to sclk = 2 did not revive it (in terms of bringing it back out of idle mode), so rebooted, again running at sclk = 3,3,2,2. The more-ambitious 3,3,3,2 will need to wait for the missing ingredients for Frankencable #2 to arrive. But we are running all 4 cards at pretty decent clock settings, both of our systems are now "full up" in terms of running as many R7s as each system's PSU can plausibly support - 2 in the old ATX-case Haswell system, sclk = 4,3, TDP ~600w, 4 in the desktop open-test-frame build, sclk = 3,3,2,2, TDP ~900w. Outstanding - and my resulting electricity bills have of course been spectacular.

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