Solved Trying to figure out Power supplies

[shrekisfree]

Hey all, I'm building my new PC, and while I was about to buy the Power supply, it sold out. Fortunately, that made me look at it harder.
Antec HCP Platinum HCP-1000 1000W ATX12V V2.32 / EPS12V V2.92 SLI Ready CrossFire Ready 80 PLUS PLATINUM Certified Full Modular Active PFC Power Supply - Intel Haswell Fully Compatible

Antec HCP Platinum HCP-1000 1000W ATX12V V2.32 / EPS12V V2.92 SLI Ready CrossFire Ready 80 PLUS PLATINUM Certified Full Modular Active PFC Power Supply - Newegg.com

It appears to have only 12V rails? Apparently this is a new thing? It appears to be able to handle everything I'm getting, but what happened to the 3 and 5V connectors? Don't I need them to run the small things like hard drives (when compared to CPU and GPU at least) and fans?

I've been looking online ,trying to find some info about this, but couldn't find any. I'm also in the middle of finals week, so my brain is pretty much shot. If someone could explain this to me in a way that prevents me from frying all my new pretties, I'd greatly appreciate it.

Thanks, hope everyone's life is going well.

 

[shrekisfree]

Also

Oh, and this is my planned build, so if I've screwed something up, please feel free to let me know.

SAMSUNG 840 Pro 256GB SATA III MLC SSD for the OS (I'm going to bring my storage HD's from this pc to the new one)

ASUS X79 DELUXE LGA 2011 mobo

Intel Core i7-4930K Ivy Bridge-E 3.4GHz LGA 2011

EVGA GeForce GTX 770 4GB 256bit

G.SKILL Ripjaws Z Series 64GB (8 x 8GB) 240-Pin DDR3 SDRAM DDR3 1866

Again, thanks for your help.

 

[Phone Man]

Read the specs.


ATX12V V2.32 / EPS12V V2.92
Full Modular
80 PLUS PLATINUM Certified
100VAC - 240VAC ~ +/-10% (Active PFC) 50/60 Hz
+3.3V@25A; +5V@25A; +12V1@40A; +12V2@40A; +12V3@40A; +12V4@40A; [email protected];

Jim

 

[GeneO]

? The link you provided clearly says it has 3.3 and 5v rails. They are probably derived off of the 12V rail, but that is good.

 

[kbrady1979]

It has everything you need, but I personally do not like multiple +12v rails, and this one has 4. Plus, it's a mile more PSU than you need. Look at something like the SeaSonic x750/850.......it's cheaper and probably a better PSU.

Here is the 750W version.....links to click on other wattages on the same page: SeaSonic X750 Gold PSU

 

[Phone Man]

I have the SeaSonic X650 and it is great. SeaSonic also makes PSU's for many other vendors.
Here is their new platinum line.

Newegg.com - Computer Hardware, SeaSonic USA, Power Supplies, 80 PLUS PLATINUM Certified

Jim

 

[madcratebuilder]

From Tom's hardware.

In older versions of the ATX specs Intel had required the CPU to have its own rail separate from the motherboard and other components. It had also specified that no rail have more than 240 VA available(20A @ 12V), this is what lead to multi rail power supplies in the beginning. Both of those requirements have now been lifted allowing for power supplies with a single 12V rail and 12V rails rated for more than 20A which is very useful.

All power supplies convert the AC(alternating current) power that comes out of the wall into DC(direct current), and most units only have a single 12V DC source, in a single rail unit all of the yellow 12V wires are tied directly to this source, in a multi rail unit they are split into bunches(rails) and tied to the source, there is a controller chip monitoring the current going into each rail and if it exceeds a set limit it will shut down the power supply. Some smaller cheaper units claim to have multiple 12V rails to comply with the old ATX specs, but actually just tie all the bunches together with no over current protection so while the label makes it appear as a multi rail unit its actually a single rail unit, this helps cut costs.

One of the big myths about multi rail units is that because of the overcurrent protection you can end up with “trapped power”, XFX uses a power supply with a 200W 12V DC source as an example:
In a multi rail unit they show the 12V source split into two 100W rails, and when loaded up with 75W on each rail from the graphics card adding 50W for the CPU onto either of the rails would cause it to shut down even though it had 50W remaining for the source and a single 200W 12V rail would have been able to handle it all fine.
The lie in this scenario is that multi rail units have their over current protection(OCP) limits set such that you wont end up with trapped power, in this scenario the unit would likely have its OCP limit set at about 130W on each rail so that there would not be an issue of “trapped power”, this is why for most units with multiple 12V rails you cannot simply add the rails together to figure out the total power available from the 12V source, you must look at the total power listed for the 12V rails listed below them. On the units where the sum of the listed max currents for the 12V rails does add up to the stated limit of the 12V source the true current limits are usually set 3-5A(36-60W) higher than the label shows.

I would recommend you buy the highest output psu you can afford. It's better to run a 1200 watt at 50% than a 850 watt at 75%.

 

[linnemeyerhere]

I tend to agree, get the best brand and don't under size it. For an aggressive rig as you're building with expansion and deterioration planned then 1000w for SLi will serve you very well. Love the Seasonic as well but many great brands to choose.