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View Full Version : PSU shifts into high gear


ricercar
05-24-05, 02:53 AM
I have a 430W Fortron 1RU server supply bolted onto the underside of my SFF for powering advanced graphics cards the way they were meant to be played. Regardless of Shuttle's continued claim that their 250W supply is sufficient for any graphics card, I have experimentation that proves my FX 5800 and FX 5900 increase their benchmark performance 5-16% with each 50W increase in power supply from 200W to 450W. (That comes to 12K Onionmarks2001se at 200W, to over 17K Onionmarks with a 510W supply on the same system! Sure a 200W Shuttle PSU is sufficient....)

So most of the time this PSU idles quietly beneath my SFF. Even when my FX 5800 kicks into Doom3 at 1600x1200, the PSU hasn't appeared to notice in any meaningful way. But tonight, the gloves came off, and the PSU started to moan.

I added a SATA RAID card to my SFF with four Seagate Baracuda 120G drives. it took only an hour before the PSU rumbled to life: the fans are turning faster than ever. My spouse looked oddly at the machine and eventually mentioned the noise level. For the first time ever there's more noise from the PSU than my WD PATA drives. Good news is that MBM5 shows no drop in the 1.6v, 3.3v, 5v or 12 volt rails. They're dead on with normal operation.

This extra push from the PSU fans feels oddly comforting, kind of like the sound of powerful automobile revving before a race. *sigh* Of course, I may change my tune if the PSU konks out before my SFF + SATA RAID playtime is over, but right now it feels good.

ragejg
05-24-05, 07:52 AM
SFF + 5800U + 4x PATA WD's + an extra PSU?!?! (crazy) Holy bejeezus! Your performance findings with the extra PSU are very impressive, however. Do you have any links to that Fortron PSU?

ynnek
05-26-05, 01:37 AM
I replaced my SS51G Shuttle PSU with a spare Dell PSU I had (yes, its your standard ATX pinout) for the noise reduction (stock PSU was a little noisey).. You can't even tell that Dell PSU is on. Now the loudest thing on the box is the HD.

http://www.nvnews.net/vbulletin/showthread.php?t=43064

GlowStick
05-26-05, 01:48 AM
fortron has some amazing 1u psu lines! nice : )

ricercar
05-26-05, 04:15 AM
Do you have any links to that Fortron PSU?
Unfortunately the bookmark for the Fortron retailer is now a dead domain. Fortunately I can reccomend an alternate supply from PC Power and Cooling, a fine manufacturer of PSUs in their own right. They now have a 1RU 400W supply: Linky (http://www.pcpowercooling.com/products/viewproduct.php?show=T401U) Despite the fine quality of the Fortron, I would have bought the PC Power and Cooling model had they made it three years ago.Features include: .99 active PFC, dual +12V rails totaling 29A, dual 14CFM fans, and full-rated power @ 50C. ... 70% efficiency ... 40 dB(A) ... SATA power connectors.
+5V @ 21A
+12V1 @ 16A
+12V2 @ 17A
-12V @ 0.8A
+3.3V @ 20A
+5VSB @ 2A
cont. power = 400W
peak power = 440W


SFF + 5800U + 4x PATA WD's + an extra PSU?!?!Actually it's 2x PATA 120G WD and 4x SATA 120G Seagate. :cool: