Looking for cheap 1200 watt power supply

Quote from maramos : You definitely want more than 10% headroom when buying a power supply. Running one at 90% load constantly is going to cause it to burn out quickly and it's terrible for efficiency.

if it's a good quality PSU it will be fine for 5+ years even at 90% if that is the max draw, and if the PSU is rated for 900W constant then it's max would be something like 1k (which is how a quality PSU would be rated), and if the electricity is free and he is trying to screw his landlord, while paying the least for the PSU, why does efficiency matter?

i re-iterate, the MAX that those cards will pull is 160W each (unless you overclock them, but you won't be able to do much with 4 of them anyways), and they won't all be working at 100% since crossfire can't perfectly distribute the workload anyways

that silverstone would be fine though (if it goes back in stock)

power supply for 4 video cards


looks like for single power supply
http://www.newegg.com/Product/Pro...rchInDesc=

Quote from gonepostl : Need two more 8 pin adapters for the two other video cards

the 7950 only needs 2x 6 pin power adapters - just use a splitter to split the 150w 8 pin pcie into 2x 75w 6 pin pcie cables

Quote from gonepostl : I'm thinking about using the two power supplies. Newegg has two with a one year warranty for only 30 bucks for a 650 watt. It's not 80+ or anything though...........thinking I might run into a problem? What do you think? I'm thinkin this http://www.add2psu.com/ And two of these http://www.newegg.com/Product/Pro...6817148041 I don't want to fry my video cards. However, they have a 3 year warranty and I really don't want to pay 200 dollars for a power supply

One thing I don't like about that Add2PSU gadget is that it's supposed to be mounted inside the computer case with double stick tape, which is not highly reliable and could come off if the adhesive fails or if the foam tape splits apart, both which happen commonly. I'd want the bottom of the device covered with 100% reliable electrical insulation and fastened in place so it can't possibly short anything. Also the $20 price seems steep, considering you can just connect the green wires of all the PSUs together to make them all turn on and off together. The motherboard normally shorts the green wire Power_On line of the PSU to ground, and the type of electronic connection is "open collector", meaning it's OK for the motherboard to drive multiple Power_On lines.

There's no way can you get a quality 650W PSU for just $30, except during a freakishly rare sale, like the one TigerDirect ran last July for an OCZ ZS650W made by Sirfa (Enermax?), which tested out great at HardwareSecrets.com, even in a hot environment. That was the bargain of the year for PSUs, and I missed the sale by 5 minutes.

I couldn't find a review of the 650W Apevia Java, but here are two other Apevia models that probably show the company's best and worst products, and keep in mind that the best, a 900W Apevia Warlock made by Wintech, shut down at just 800W, and apparently it was an 800W PSU but was relabeled as a 900W by Apevia:

http://www.jonnyguru.com/modules....nt&reid=92

The worst quality, a 450W Apevia Turbolink, made by Solytech, broke down at just 240W:

http://www.hardwaresecrets.com/pr...eview/1212

I don't know where the 650W Apevia Java falls between those two models, but notice it has no UL file number under the UL symbol, indicating fake certification. BTW some products have fake file numbers, so always verify the numbers at UL.com (or CSA.ca for CSA certified products).

Those websites are among the very few that do legitimate PSU reviews, that is, they take DC amp measurements and try to load down the PSUs to their full ratings, rather than just take only voltage measurements and use a computer as the load. Some other good reviewers are HardOCP, SilentPCreview, and XbitLabs.

You don't want to skimp on PSUs because quality varies more than for any other component, and when a bad PSU fails it may not simply shut down but may also damage your hardware, regardless of what kind of protection the PSU contains. OTOH I'm not saying you should pay a lot because I've never spent more than $20 on a PSU yet have never bought junk, except when it was free after rebate. But do get something that's rated highly by one of those review sites I mentioned, and keep in mind that many brands of PSUs are made by several different manufacturers, so don't assume that a Widget Corp. 750W Falcon123 is the same as a Widget Corp. 750W HawkXYZ.

I bought this. Seems solid
http://www.newegg.com/Product/Pro...6817256041
I GOT THE LAST ONE. I refreshed after I was done to check the specs and sold out. Anyway. It seems solid as hell from the 80 PLUS certified and all. 165. Kinda decent? Idk. What do you think? Solid?

Quote from slapshot136 : the 7950 only needs 2x 6 pin power adapters - just use a splitter to split the 150w 8 pin pcie into 2x 75w 6 pin pcie cables

Checked out visiontek specs and it's 6pin/8pin
Edit: I'm really nervous. I've only spent around 2k on a machine like 7-10 years ago. Very nervous.

visiontek's 7950 uses 2 6 pin PCI Express, the 7970 uses 1 8 pin 1 6 pin.



they prob typoed

i dont understand bitcoin mining, but what does 4 GPU's do for you? only people i know that do this kind of multi-GPU is super epeen gamers and people who fold

Quote from gonepostl : I bought this. Seems solid http://www.newegg.com/Product/Pro...6817256041 I GOT THE LAST ONE. I refreshed after I was done to check the specs and sold out. Anyway. It seems solid as hell from the 80 PLUS certified and all. 165. Kinda decent? Idk. What do you think? Solid?

Congratulations. You bought one of the best PSUs available.

Quote from IPT : visiontek's 7950 uses 2 6 pin PCI Express, the 7970 uses 1 8 pin 1 6 pin. they prob typoed i dont understand bitcoin mining, but what does 4 GPU's do for you? only people i know that do this kind of multi-GPU is super epeen gamers and people who fold

Ya, so it's 6 pin 8 pin since it's four 7970's. The gpu is actually the most efficient by far method to decrypt megahashes. Cpu doesn't even come close. All I know is it cranks the streamline processors. And that's what you need for decryption of megahashes/sec

Quote from gonepostl : They are going to be 7950's

Quote from gonepostl : Ya, so it's 6 pin 8 pin since it's four 7970's

this makes a difference..

Quote from IPT : only people i know that do this kind of multi-GPU is super epeen gamers and people who fold

it's roughly similar to folding, except you might get some money out of it instead of helping research cancer if you don't pay for electricity (but not enough to pay for your computer over it's lifetime)

Quote from slapshot136 : this makes a difference.. it's roughly similar to folding, except you might get some money out of it instead of helping research cancer if you don't pay for electricity (but not enough to pay for your computer over it's lifetime)

Not true. I should decrypt about 1.32 bitcoins a day. At the rate it's at that's roughly 15 dollars a day. Should pay itself off in no time! I don't gotta pay for electricity. Where are you getting this from?!

Quote from gonepostl : Not true. I should decrypt about 1.32 bitcoins a day. At the rate it's at that's roughly 15 dollars a day. Should pay itself off in no time! I don't gotta pay for electricity. Where are you getting this from?!

you're assuming the bitcoin value is still gonna stay at 15 consistently.

btw you're all over the place with your hardware, why do i think its trolling?
you keep changing your base hardware
7970 are a big difference from 7970s

anyway i don't know anything about bitcoin so i'll be done chiming in on your thread
good luck.