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How many AMPs do i need? (on +12 rail) - Page 2

post #11 of 12
Quote:
Originally Posted by shinji2k View Post
There is a difference, 8A on the 12V. It doesn't say much that it could have been rated at 500W. It's rating reflects the trend in 12V heavy systems
Load test is two pages earlier
With this maximum configuration (44 A from +12 V, 7 A from +5 V and 7 A from +3.3 V – i.e. a total of 596 W!) the power supply would turn on and work for around 30 seconds, after that the power supply would shut down due to overload....
We decreased two amps from the +12 V output and we could make our 450 W power supply to work stable at 570 W at 48º C

We can drop off few amps more and that's still more than many 500W PSUs have meaning something like 300W on 12V isn't that much.


So considering consumption numbers it's enough for any single graphic card PC (excluding heavier overclocking/-volting and maybe some "double-decker"/dual GPU cards) and mainstream card CF/SLIs
post #12 of 12
Quote:
Originally Posted by desertmonk View Post
So is 33a on the +12 (VX450) suitable?
Yeah, it should last you a while. But it's hard to predict future power consumption. For example, Intel has been good at reducing power consumption and at the same time adding more cores. So who knows what CPUs will be like in a couple of years. On the other hand, gpus are increasing in power consumption rapidly. The increase is in line with performance and there have been improvements in power consumption especially in mid-range. But for high end graphics, I don't have high hopes that power consumption will remain static (power improvements balancing performance gains).

More is always better if you can find the few extra quid for the vx550. The 550 is probably the safest bet for future-proofing especially considering rising gpu power consumption.
Quote:
Originally Posted by EsaT View Post
With this maximum configuration (44 A from +12 V, 7 A from +5 V and 7 A from +3.3 V – i.e. a total of 596 W!) the power supply would turn on and work for around 30 seconds, after that the power supply would shut down due to overload....
We decreased two amps from the +12 V output and we could make our 450 W power supply to work stable at 570 W at 48º C
I like how Gabriel does his reviews, although the table below that paragraph is wrong. He said it got it to somewhat run with 44A on the 12V, but 2 less would run perfectly (42A). But in the table he lists 17+17A. Either way, the way this PSU behaves is characteristic of the mid-range Seasonics. I've seen a few instances of their PSUs being able to run stable at 20+% above their labeled specs. It's nice to know you have a little more room than is labeled for peak or short periods but it does make you question the long term. No one that I know of has tried to load a quality PSU to it's rated max and see how long it takes to fail. For some of the better PSUs this could take years. I can almost guarantee that pushing the PSU to 120% will have an effect on it's lifespan, but there's a good chance that the effect will be minimal.
i7 monsta
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.2GHz] [1.325V] ASUS P6T Deluxe V2 2x XFX 5870 [1000/1250] G.Skill 3x2GB 1600MHz 
Hard DriveOSMonitorKeyboard
X25-M 80GB, 320GB WD Scorpio Black Vista x64 2007FP-3007WFP-2007FP-1080p 32" OCN Ducky Brown 
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Silverstone ST85F-P whiteOut G9 
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i7 monsta
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.2GHz] [1.325V] ASUS P6T Deluxe V2 2x XFX 5870 [1000/1250] G.Skill 3x2GB 1600MHz 
Hard DriveOSMonitorKeyboard
X25-M 80GB, 320GB WD Scorpio Black Vista x64 2007FP-3007WFP-2007FP-1080p 32" OCN Ducky Brown 
PowerCaseMouse
Silverstone ST85F-P whiteOut G9 
  hide details  
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