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Critique my new build / questions (2500k, H100, MIVE Gene-Z, M4/256GB, 6950) - Page 2

post #11 of 12
Quote:
Originally Posted by friend'scatdied View Post

Don't worry about the 80 Plus ratings. 80 Plus Bronze is generally sufficient. Silver, Gold and Platinum are extra certifications that cost more, and the manufacturers pass the cost of certification down to the consumer.
HardOCP has an article about the 80 Plus myth here:
http://www.hardocp.com/article/2011/09/15/80plus_irrelevant_to_you_when_buying_psudone/
In short, rating doesn't matter but do get a quality unit from a reputable brand. 550W is enough for the system you've picked out but it's not very forward-thinking for upgrades in the future.

yah..what if you want to say..OC to 4.8 someday? and OC your gpu @ the same time?
 
Thuban Powah!
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Thuban Powah!
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cheap! Newegg box panel ibeats with onboard. 
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OCZ Agility2 40gb WD Blue 500GB Lite-On RASA waterblock 
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post #12 of 12
I have to agree about a quality PSU. Don't skimp on the PSU and don't forget to purchase a quality Uninterruptable Power Supply rated for at least 1,000 VA. (not the same as 1,000 W) APCs are popular brand but there are other good companies out there too.

I really can't stress the importance of those two components enough.

Also, I do not know what sort of power the 6950 draws and if it draws 140W peak then a 550W PSU may not be enough.

I'm running 8 GB of 1.50V RAM (2 x 4 GB DIMMs), an i5-2500K with a 4.8 GHz OC at 1.400V (max) Two 120mm fans, an 80mm fan, and a GTX 580 factory OC'd video card from eVGA and when I run a GPU benchmark and a Prime95 maximum power consumption on 3 cores (running on 4 cores will kill the video benchmark) simultaneously, my system draws 600Watts peak. (on the nose) Since I believe in roughly a 10% factor of safety on top of my worst case conditions, a 650W PSU is the minimum I consider adequate for my system.

Now, I realize that benchmarking a GPU and 3 of your 4 CPU cores simultaneously is not something the average person does but the point is that it represents an absolute maximum worst case power consumption scenario and in that case a 550W PSU will not cut it. (I am powering a USB 3.0 external hard drive, a USB wireless transceiver for my keyboard and mouse and I also have a single DVD RW that is not active during this double-bench/stress test.

My video card draws 160W in that benchmark. With my 850W PSU I do have enough headroom for a second card in SLI but not a third as I earlier wrote. A second card would put me up to 760W peak and I have a 90W buffer to spare for things like DVD's spooling up, hard drives all thrashing simultaneously and a bit of comfort zone for my PSU on top of that.

Your 6950 may consume more or less power than my GTX 580, I'm not sure but I highly doubt that it only consumes 40W peak, which means that I doubt a 550W is truly adequate for your system.


I'm using this Corsair Enthusiast TX-850. It's a bronze 80+ certified (which is probably irrelevant, although I doubt that Corsair "cheated" to get that certification.) It's also 850 Watt, which gave me plenty of headroom for my purposes. (Single i5 with single video card and few peripherals. I have headroom for dual or possibly even triple SLI if I want.) That PSU $135 after mail-in rebate ($150 without) and although it may seem like overkill on the power it supplies, it is SLI certified/Crossfire ready and approved for an i7. It also has a very quiet cooling fan (near silent).

I'm not sure how good the SeaSonic company is with their quality control and component selection, but I know that Corsair makes a very high quality power supply and so do Antec and Cooler Master. I've been a long-term user of Antec PSUs and was really impressed with my Corsair.

As others have suggested, I suggest that you buy a high quality PSU that is 750W or 850W to give yourself room to grow in the future.

Skimping on a PSU means that if you ever do have an UPS failure or, major power surge that bites through your UPS, or heaven forbid a PSU failure, a good PSU will keep your motherboard, RAM, CPU and GPU from being fried where a cheap PSU will transfer the fault all the way through to all of your components if you have the misfortune of using your computer when things get bad. I had a cheap no-name brand PSU fail on me when I was using the PC and I lost my motherboard, RAM, CPU, and video card. It fried my entire system when it failed. (I've been an Antec/Corsair PSU customer ever since then.)

That's not to say that quality name-brand PSUs can't fail; they can. I had an Antec PSU blow up on me during a nasty power transient after 8 years of use and my system was on at the time. (Turns out the battery in my UPS was shot, so the transient came right through it and toasted my PSU.) I lost no components other than the PSU itself. (I replaced the battery in my UPS and I also repaired the blown components in the PSU and am using it now in my old box.)

I realize this is all anecdotal, and even with a good UPS and PSU you can still fry boards, but it's less likely to have dire consequences with quality components than if you were using cheaper components.
Edited by shad0wfax - 11/25/11 at 3:44am
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