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Do I need a bigger power supply?

post #1 of 13
Thread Starter 
So I have been maxing the system out competing in the ATI/NVIDIA benchmarking competition:cool:

Currently trying to push 3Dmark03 scores up currently at 83690 and trying to break 90,000 like others with similar setups. This score is with CPU at 4.0@ 1.475 and GPU at 950/1400 1.25v +20 with no errors.....

Problem is BSOD during CPU test 1 or 2 so I feel like the CPU just cant get enough juice

settings when BSOD occurs are:
MB: ASUS Crosshair V Formula
CPU: 1090T BD 4.2 @ 1.48v in BIOS gets up to 1.52 with load line
CPU/NB 3000 @ 1.4v
VDDR: GSKILL CAS 7 1600 @ 1.65v
GPU: MSI R6950 1000/1400 1.30v +20mv mem/aux
3 7200 RPM SATA hardrives
2 BD dvd drives
fan controller
9 fans
multicard reader
Happauge PCI TV Tuner

PSU: Silverstone ZEUS ST75ZF (80 effic. sli approved) 750 w
4 +12v rails 18amp per rail

I have all the wiring attached to Silverstone spec that came with PSU
vdbaZ.jpg

AIsuiteII says +12v is at 11.8 same as bios under load
HWMonitor says +12v is at 11.33 under load

have tried a few PSU calculators(asus, newegg,eXtreme Power Supply calculator Pro) that give a range from 700w to 950w PSU is required for my system

any ideas?
 
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post #2 of 13
650 Watt is enough for that. Don't even worry about your Silverstone 750, its barly cruising.
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post #3 of 13
You can crossfire on that so overclock as much as you want. Heck even think about getting a DICE pot.biggrin.gif
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post #4 of 13
looks like you could be Overloading one of the 12V rails, depending on how far youve OC'd that 6950. Your only able to get 216W from 1 12V rail and a 6950 @ stock settings has a TDP of around 200W.

You may need to upgrade if you plan to push further, not in wattage, but in a psu with more amperage on its 12 Rail/s

I dont think this would have too much of an effect on the CPU benchmark but then again im no expert with 3Dmark
    
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post #5 of 13
Quote:
Originally Posted by mad87645;15399885 
looks like you could be Overloading one of the 12V rails, depending on how far youve OC'd that 6950. Your only able to get 216W from 1 12V rail and a 6950 @ stock settings has a TDP of around 200W.

You may need to upgrade if you plan to push further, not in wattage, but in a psu with more amperage on its 12 Rail/s
This PSU has a +12V capacity of 720W which is 60A. wink.gif

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=25
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post #6 of 13
Thread Starter 
Right on guys good stuff I figured wattage wise I was close because of the high OC and raised voltages of the CPU and the card....and was unsure about what the amps really where..the card specifically allows for full voltage adjustment and is running a modded BIOS takes 2 6pin pcie so Im sure its hitting a max luckly it is all that's on that line..the CPU on the other hand is hopefully where this BSOD is coming from because when card cuts out you get the screen bars w/o reset..not sure if I can push voltage without going under water

so looks like I may look at a single rail strong enough to CF 2 6950's but will have to wait till next years comp cause I out of cash!
 
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post #7 of 13
Thread Starter 
well I was off there on if I need a PSU or not that's a good write up on the zeus but if 12x18 = 216 then yeah the 200 TDP i have 16w headroom ...so if I am raising voltages this has to go up...the CPU says only 174w using a watt calculator so that rail is fine...what I need to do is use a 12v2 connector 6pin pcie that would level everything out to balance the GPU! and the CPU I still not sure??
 
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post #8 of 13
18A is not the capacity though. I don't know how to put it in my own words, but it's not the capacity. The +12V capacity of this PSU is 720W (60A).
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by TwoCables;15403186 
18A is not the capacity though. I don't know how to put it in my own words, but it's not the capacity. The +12V capacity of this PSU is 720W (60A).

yeah your right 60 total on +12v but each trace only takes 18amps before it cuts out as far as I can tell
 
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post #10 of 13
Quote:
Originally Posted by ryan w;15406911 
yeah your right 60 total on +12v but each trace only takes 18amps before it cuts out as far as I can tell

The actual overcurrent trip point in situations like this, is usually well over the advertised figure. Maybe 25A instead of 18A, and so on. It's rare to have an isssue.
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