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2020-08-12, 01:53   #342
PhilF

"6800 descendent"
Feb 2005

72510 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

11,743 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 24×47 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 11,743 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.
 2020-08-21, 19:45 #346 ewmayer ∂2ω=0     Sep 2002 República de California 11,743 Posts Assembled Frankencable #2 early this week - see attached pics. Sorry about the contrast issues - I put on a nearby windowsill in a misguided attempt to get better lighting. Pic 1 is as initially assembled, PSU plug at lower right, 8-pin PCIe power-out plug at top. Pic 2 shows after a bit of zip-tying, now PCIe power-out plug at far left. But ... after rigging up a 2nd GPU the same way as the one using Frankencable #1 - one 8-pin PCIe power-out plug from a regular 8-pin power cable, the other via Frankencable - the system proved unstable, even at the sclk = 3,3,2,2 mix I'd been using with just the one Frankencable, which yields TDP ~= 900w. The mysteries of PSU power ... anyhow, yanked the 2nd Frankencable, just gonna run with the one at the aforementioned settings, unless another bright idea occurs to me. :) Attached Thumbnails     Last fiddled with by ewmayer on 2020-08-21 at 19:46
 2020-09-11, 13:27 #347 aheeffer   Aug 2020 3710 Posts Interesting times with the announcement of the new RTX 3080/3090/3070 cards. Retailers are dumping their 2080 S and ti cards at 50% the price and I see a lot of used Radeon VII coming back on the market. I had two slots to spare on a newly build rig: an Asrock H110 pro BTC+, a reused Intel i7-7700 with 16GB, a new Corsair 1600i PSU and a reasonably priced rack case for 6 GPU's. I replaced the six Chinese fans with 5 new Enermax D.F. Storm fans because the high-pitch noise was unbearable. Then I moved three Radeon VII from separate desktop boxes in the rig. With the proper ventilation I could run them at full power. The empty slots were staring at me, so I am now filling them with second hand ones I try to get for about 500 € on Ebay. I now use the gpuowl pooling option which reduces the maintenance considerably. The new RTX 3080 is estimated to run PRP's faster than the Radeon VII, but I am somewhat skeptical about that. Attached Thumbnails
 2020-09-11, 14:19 #348 paulunderwood     Sep 2002 Database er0rr 2·2,141 Posts A nice looking rig with a great PSU. Send us another picture when you've installed the other R VII's, I particularly like the way the disk is just hanging about!
 2020-09-11, 14:57 #349 storm5510 Random Account     Aug 2009 Not U. + S.A. 23×3×97 Posts An interesting setup. At 900W TDP, it would cost 85 USD per month, at my service rate, to run it. This is for 120VAC. I don't know what he's using.
 2020-09-11, 22:31 #350 Xyzzy     Aug 2002 3·2,837 Posts Where are the 2080 cards for half price?
2020-09-11, 22:46   #351
moebius

"CharlesgubOB"
Jul 2009
Germany

2·311 Posts

Quote:
 Originally Posted by aheeffer . The new RTX 3080 is estimated to run PRP's faster than the Radeon VII, but I am somewhat skeptical about that.
I guess only the RTX 3090 is really faster, if someone got one of these please post immediately a benchmark for serveral fft's at the wavefront.

Last fiddled with by VBCurtis on 2020-09-11 at 23:14

 2020-11-05, 02:00 #352 paulunderwood     Sep 2002 Database er0rr 2·2,141 Posts amazon.co.uk has some cheap secondhand Radeon VII, cheap compared to eBay offerings, including one for £340. There are ones for £240. I just snapped one up. Another 40-core equivalent card is winging its way to me. Last fiddled with by paulunderwood on 2020-11-05 at 03:09

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