How many would even have anything near the recommended PS for a X1900XT?

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Yreka

Yreka

Diamond Member
Jul 6, 2005
4,084
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76
Originally posted by: GOREGRINDER
antec truepowerII 550 sli cert. 19A+19A
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Snip from the link above.

....AMD encountered these same issues with an Antec TruePower TP2-550EPS12V 550W power supply, which is also SLI certified by Nvidia. AMD now tests power supplies with dual-graphics cards by running Doom 3 at 1600x1200, 16x AA, and maximum AF. According to Brett Jacobs, this will almost always result in a shutdown if the supply can't handle the load. Our experience is that looping 3DMark06 at 1600x1200 with AA and AF fully cranked up can also cause the failure, even with systems that can run Doom 3.
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moonboy403

moonboy403

Golden Member
Aug 18, 2004
1,828
0
76
lol...the last psu that i had without 30 amp on the 12v rail was the thermaltake purepower 480w

that sucker only had 18amp, i was on a lifeline with the oced prescott/hot
 
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Fraggable

Platinum Member
Jul 20, 2005
2,799
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Maybe it makes more sense to look at how much current your cards are actually pulling to determine what is adequate. Using ATI Tool my X1800XT is pulling 10.9A t idle. Does this go up during load? I would imagine so.
 
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santz

Golden Member
Feb 21, 2006
1,190
0
76
i have a dell 9150 375 watts system and i just bought a x1900xt,whould i get a new psu or what?

1hd, 2 dvd roms, 1gb ram (2x512) what do u all say and since x1900xt consumes like 190 watts at full load, should i just stick with this?
i am not plannig to upgrade to crossfire in future.
 
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framerateuk

Senior member
Apr 16, 2002
224
0
0
Im running a 360W SilentX psu in my shuttle, with an X2 4200, 3 hard drives (one is a raptor) and an X1900XTX and ive had no power supply problems at all.

Heat problems is another thing though :)
 
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Aries64

Golden Member
Jul 30, 2004
1,030
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0
Originally posted by: Demoth
Not even some of the best rated and most popular PSUs on market supply more then 20A on the 12V rail, despite how many watts they are rated. And the recommended 38A for the crossfire means even fewer. Wonder how conservative ATI is being on the recommendation and if they are just going overboard to cover their bases and blame the PSU if anyone has a problem with the cards.
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Well. for starters, just because a power supply is rated well and popular does not mean squat. A power supply could be "rated" well by a "reviewer" if it meets the basic "specs" given by the PS manufacturer and doesn't crash the reviewer's system while testing. And lots of PS' are "rated" by reviewers who aren't running power-hungry high-end videocards like the 7800GTX, 7900GTX, and X1900XT/X cards. Or even the last generation cards such as the 6800 Ultra and X800 XT/PE / X850 cards.

And unfortunately for consumers, most PS companies use peak power output in their specifications as opposed to nomininal/sustained power. Peak power is typically at startup while the power supply and other components, i.e. CPU, GPU, hard drives, memory are cool. We all know that as components heat-up efficiency is lost. Nominal power is what you should be looking at when spec'ing-out PS'. PC Power & Cooling uses power delivered with the PS at 50C for their published PS specifications. Peak power specs are at 25C. For instance, the PC P & C 510 ATX/510 ATX Deluxe/510 Express, and 510 SLI are rated at 510W (nominal/minimum/sustained) at 50C, while at 25C they provide 650W at maximum/peak.

ATI and Nvidia have to be conseravtive in their minimum PS ratings to "cover their bases" because, like others have said, not all power supplies are created equal. Again, most PS manufacturers use peak power as opposed to actual sustained power for the PS specs because it makes the PS look better than it really is. Effieciency also play a part in the sustained power output. They have to consider this, as well the fact that there are many cheap asses out there that will buy some crap PS trying to cut corners. Sorry if I sound elitist, but a spade is a spade and that is reality. My only dislike about the 510 Series is the 75% Efficiency. I have a 510 SLI and a 510 ATX Deluxe (same specs, just different connectors) and they are awesome but I have that one gripe, even though they power their respective systems 24/7 without a hiccup.

My main rig (see full system specs in my sig) uses a 510 SLI. I am powering 4 15K RPM SCSI hard drives and 2 opticals along with an FX-57, X1900XT-X and 2GB of memory. My 12V rail is 34A. I probably won't go Crossfire, since I usually upgrade my videocard every other generation or so, but if I want to go Crossfire I will step-up to the plate and buy a PC P & C 850SSI. And because the 850SSI (and the 1K also) are much longer than the 510 Series I'll have to buy a case with a deeper PS bay (V1200 maybe) in addition to an X1900 Crossfire Edition. So it won't be cheap for me either.

510 specs at a glance:

Output +5V @ 40A
+12V @ 34A/38A
-5V @ 0.3A
-12V @ 2A
+3.3V @ 30A
+5VSB @ 3A

Continous power = 510W
Peak power = 650W
Regulation (+3.3V, +5V, +12V) = 1%
Regulation (+5V, -12V) = 5%
 
A

Acanthus

Lifer
Aug 28, 2001
19,915
2
76
ostif.org
Originally posted by: costi
Antec TPII 380W. x1900 XTX with Opteron 148 2.85GHz, 2xHDD and DVD writer.
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They are obviously very conservative with their rating then. I would say any quality 400w would cover the average game then.
 
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Extelleron

Diamond Member
Dec 26, 2005
3,127
0
71
Originally posted by: Acanthus
Antec TPII 500w here. 36A on 12V.

Cheap with great cable management.
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Best value is the FSP 450W for $50. Runs the setup in my sig perfectly.
 
L

lodmdma

Member
Aug 28, 2005
189
0
0
yea i have a fortron 450.(15.5 on each rail) im upgrading my 7800gt to a x1900xt........hopefully the power supply will be able to handle it
 
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josh6079

Diamond Member
Mar 17, 2006
3,261
0
0
Originally posted by: Ackmed
+12V Combined Output: 54 Amps (62 Amps, 744 Watts, Peak)
Weight: 8 lbs.

A mans PSU. ;)

Most PSU's over exaggerate their specs, which is sad. And misleading to me.
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Don't you have the PC Power & Cooling 510W? Does it really get up to 744W at peak?

Originally posted by: sodcha0s
Add another...

OCZ Powerstream 520: 12v@33a in my rig with an XTX installed
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Same here, works great.
 
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1Dark1Sharigan1

Golden Member
Oct 5, 2005
1,466
0
0
I'm using a NeoHE 550W (3x18A 12v rails with total combined output of 42A). Works fine. 100% stable on my system with my X1900XT @ 725/1670 with 1.5v

Before that I had an OCZ PS 520W SLI but I never ran my X1900XT on it.
 
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lodmdma

Member
Aug 28, 2005
189
0
0
im thinking about getting a enermax liberty 500w
enermax liberty 500 this PS any good??

anyone have this?? i have a fortron 450 with 18a on each rail.....when i try to overclock my x1900xt...my comp freezes

 
Captante

Captante

Lifer
Oct 20, 2003
30,354
10,881
136
Antec Neo HE SLI - 550 watt / 42 amp (Opteron 170/X1900XTX)

PC Power & cooling Turbo cool - 510 watt / 34 amp (AXP 3200+/Radeon 9800 Pro)

OCZ Powerstream - 520 watt / 33 amp (Tualatin P-III 1.4/Ti4600)

Havn't tried Crossfire or SLI on any of these 3 units but all work well ... my bet is that the Turbo Cool 510 actually has the highest output of all of them too, although I'm using the Antec in my main rig because the PC P&C only has a 20-pin ATX connecter.
 
H

Howard

Lifer
Oct 14, 1999
47,986
11
81
Originally posted by: lodmdma
im thinking about getting a enermax liberty 500w
enermax liberty 500 this PS any good??

anyone have this?? i have a fortron 450 with 18a on each rail.....when i try to overclock my x1900xt...my comp freezes
Click to expand...
See if the problem still happens when you power the card with a 4-pin Molex to PCI-e adapter.
 
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imported_michaelpatrick33

Platinum Member
Jun 19, 2004
2,364
0
0
Originally posted by: Dethfrumbelo
Originally posted by: xtknight
Originally posted by: Yreka
I'm covered
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Dual rail though, right? Not sure if you are, necessarily. :) (18A is probably still way overboard anyway.)
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Exactly. Dual rail would have major problems with SLI or Crossfire, with only one 15-18A rail driving both cards.
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Hmmm. I have had two 7900GTX in SLI at 720core and 1811 memory since they came out in SLI on a Seasonic S12 600 with dual 18A rails with nary a glitch.
Opty 170 at 2.4
Raptor/X-fi/2gigs of ram/DVD-rw/ blah
 
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