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Antec HCP-1300 Connection/Multi-Rail Nightmare! -PLEASE HELP!-

post #1 of 31
Thread Starter 
Just got a brand new Antec HCP-1300 Platinum PSU (wish I had kept my Antec HCP-1200:cry:).

I am running 4-Way Titans (stock BIOS and stock clocks).

The computer keeps crashing (shutting off and then restarting) when I play a game or run a benchmark - definitely power related me thinks.

Connections are really confusing - There's an 8-pin connector hanging from the 24-pin MoBo connector that I plugged into Rail 12V1 directly below the 24-pin connection.

The connections are as follows:

1.) 12V1 --> 8-pin from MoBo connector, 2x 8-pin CPU connectors (CPU1 & CPU2), peripherals (HDD etc.).
2.) 12V2 --> 2x GTX-Titan GPUs (both using 8-pin connectors on the PSU side)
3.) 12V3 & 12V4 --> 2x GTX Titan GPUs (both span two rails (V3 & V4) because they are 16-pin connectors on the PSU side)

I tried different combinations of connections - nothing works. The computer keeps crashing the moment I start playing (GTAIV, BF4, AC4, etc.) or run a benchmark.

There are no instructions with the PSU.

Does anyone know how to properly hook up 4-WaySLI to a multi-rail PSU like the Antec HCP-1300 Platinum?

Need help/advice ASAP.

TIA.

Pics for reference:

1391482815nlmTkdozhw_2_9.gif
1391482815nlmTkdozhw_3_1_l.jpg
     
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post #2 of 31
4 video cards and CPU/motherboard on a PSU with 4 rails

Reason why its shutting off is you are overloading one of the rails

Either downclock or get a PSU with more or stronger rails
Edited by shilka - 3/1/14 at 4:52pm
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post #3 of 31
Let's see... Assuming that you use the system on your signature, the 4 Titans are like 250 watts each. 1000 watts in total. The overclocked 3970x is like 300 watts of load on the CPU VRM (the cpu itself is like 250, the rest are wasted by the vrm). Just with that, you reach the limit of the PSU. 1300 watts.

Now, the extreme11 is a beast with a gazilion of integrated peripherals that draw a lot of power (the thing has SAS with caches and all that ffs). The ram is the fast kind that draws a lot of power too. All your drives work at the same time because of the RAID and so does the SAS controller (cause x79 cannot do raid0 with 8 drives). That's like 200 watts going to the board and the connected peripherals, and those work all the time.

All that is without taking the rest peripherals and extras into account (cpu cooler, fans, more drives).

So in total you have like a 1.5 Kilowatt load during those "benchmarks". No wonder the thing turns off. If it didn't, it'd pop a transistor or something.


Edit: Note that there is no chance of this being a multi-rail issue in this particular case. Antec (or delta?) set the over-current limit on each rail too high. The wires would melt long before you'd reach the current limit of each rail.
Edited by PsyM4n - 3/1/14 at 5:12pm
post #4 of 31
Set each Titan in the separate rails marked by the lines, and put the two cpu 8pins into any of the connections in the red circle.




Each of these rails can give a single Titan around ~1.35v without OCP triggering. All the rails used together with Titans though might be less, maybe 1.3v or less. I had the HCP-850 Platinum, and that was my findings.
    
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post #5 of 31
The 850 watt version had a 40A limit per rail.

This is the 1300 watt version. It has a 50A limit pair rail. That's like 25% more. It's not a multi-rail problem. As simple as that.
post #6 of 31
Quote:
Originally Posted by PsyM4n View Post

The 850 watt version had a 40A limit per rail.

This is the 1300 watt version. It has a 50A limit pair rail. That's like 25% more. It's not a multi-rail problem. As simple as that.

Sorry, but if you set two Titans to one rail, it'll trigger OCP. Apply a little voltage and overclock, these GK110 chips hog the juice.

This is the issue OP:
Quote:
2.) 12V2 --> 2x GTX-Titan GPUs (both using 8-pin connectors on the PSU side)
    
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post #7 of 31
How exactly is this going to happen? Each 8-pin connector can give like 150 watts before burning. That's 12.5 amperes. Even with 4 of those connectors per rail and your system drawing all it can for each connector you'd still be within the 50A limit before the thing starts to smoke.

That's not even the case here. The Titan SC use one 8-pin and one 6-pin connector. The 6-pin gives 75 watts, that's 6.25 amperes. Adding the 12.5 amperes from the 8-pin cable, each card can't draw more than like 20 amperes from its PCI-E connectors. You'd be like 10 amperes below the rail limit even if you connected 2 Titans on the same rail.

The numbers exclude the rails from being the issue here. No matter how you look at it.
post #8 of 31
Thread Starter 
Quote:
Originally Posted by MrTOOSHORT View Post

Set each Titan in the separate rails marked by the lines, and put the two cpu 8pins into any of the connections in the red circle.




Each of these rails can give a single Titan around ~1.35v without OCP triggering. All the rails used together with Titans though might be less, maybe 1.3v or less. I had the HCP-850 Platinum, and that was my findings.

That's exactly what I was looking for!

However, there seem to be a couple of issues - as mentioned in the OP, there are two PCI-E connectors with 16-pin connectors (they span the entire row (so 12V3 & 12V4 on the right side) which means one GPU is split between two rails. Since the other connector is the same way (16-pin), it also has a GPU across the same two rails (12V3 & 12V4). So, essentially, there are two GPUs shared between 12V3 & 12V4.

The other thing is, the other 3 PCI-E cables that came with the PSU are 8-pin on the side that connects to the PSU (instead of the 16-pin like the other two I mentioned). One of these, I connected to 12V2 which is fine. Where do I connect the 4th card?

The 4th card has only these options:

1.) connect to another 12V2 slot (tried already and computer crashes so scratch that).
2.) connect to either 12V3 or 12V4 which already power 2 other GPUs - if I plug it in there, the 12V3 and 12V4 rails will be powering 3 GPUs.

I will try the connections you suggested but as I said, on the right side of the picture (12V3 & 12V4), since those two cables are 16-pin on the PSU side, they go horizontally and HAVE to connect to two rails. Is there any way to avoid this?

By the way, it most likely is not a PSU issue (in terms of power) because I used to have an Antec HCP-1200 PSU that powered 4x GTX-680 Classified (2 8-pin connectors so more power draw than Titan) over-volted and overclocked. Ran all day without issue.

Ran 4 Titans at 1.212V fully OC'd and also ran all day.

I got a Lepa G1600 thinking the power would be an issue and that was a turd - it would crash every time the power draw was near 1500W or above.

Also, the Antec HCP-1200 was pulling >1500W (many times around 1700W) during gaming/benching and never broke a sweat.

Unless they nerfed the HCP-1300 or this particular unit is faulty, I think the PSU should easily handle 4-Way Titans.

This particular issue I'm having is definitely a multi-rail/connectivity issue.
     
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post #9 of 31
I see what you mean. You need another 8pin cable that splits two cables for one Titan that goes into one rail. The 16pin cable goofs up a 4-way SLI possibility.

Pretty dumb.

One thing you could try is putting the 16 pin into the circled area and use the 8pin that corresponds with 12v1 into the Titan. If that doesn't work, then try vise-versa with 6pin into the Titan.

    
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post #10 of 31
Thread Starter 
Well, things got a little strange... now, even 3-way SLI is crashing. I tried swapping the cards out but it still crashes.

I was able to run a couple of benchmarks but after a couple of loops, hard shutdown and reboot.

I tried gaming, shutoff and reboot within 5 minutes.

Something is definitely off - I can't tell whether it's the connections or the PSU itself(?).

Really need advice with this.

So you recommend NOT having more than one GPU per rail? Can both CPU connections run on 12V1 (as they are now along with the 8-pin from mobo cable and the peripheral connectors)?

This is extremely aggravating - the PSU is brand new too! mad.gif
     
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