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ampexperts
Anon
2015-Feb-12 2:22 am
Replacng Seasonic 650ht with Coolermaster v650I picked up a used nVidia GTX580 for use with Premiere CS6. I was going to install it, but had second thoughts when I learned of the 42a 12v requirements. Even though my Seasonic is 'crossfire rated' the 12v bus is capped at 18 a.
I'm looking at Coolermaster v650, with good ratings on newegg. Only concern is single shared 56a 2v buss. Is my concern unfounded? |
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kvn864 join:2001-12-18 Sun City, AZ |
kvn864
Member
2015-Feb-12 9:03 am
no, 650W Seasonic will work fine. Seems it is multi-rail PSU, Just make sure you distribute these rails properly: GPU, CPU, Mobo, etc. to separate ones. |
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JoelC707 Premium Member join:2002-07-09 Lanett, AL |
to ampexperts
Where did you find mention of a 42A power requirement? Nvidia's own specs indicate 244W max draw (at 12V that's ~20.3A): » www.geforce.com/hardware ··· ications. They recommend a minimum of a 600W PSU and it needs a 6-pin and 8-pin PCIe connector. Researching your Seasonic PSU it apparently has just two 6-pin connectors and no 8-pin but has four 18A 12V rails with 52A of combined 12V power (math would say 72A but these can't always be directly added together): » www.newegg.com/Product/P ··· 17151028. I can't tell what rail goes where on the PSU and there's no description that I've found. Normally in a 2-rail setup you have one for the motherboard and all drives and one for the CPU/GPU connectors. In a 3-rail setup it's usually motherboard+drives, CPU and GPU. I suspect your 4-rail setup has separate rails for each GPU cable but I'm not positive. If that's the case you have the potential of 36A to your GPU just through the supplementary power cables (more when factoring in what the slot can provide). Overall, I think you're good with your current PSU. To get the 8-pin connector you have two options: » www.amazon.com/StarTech- ··· to+8+pin or » www.amazon.com/StarTech- ··· to+8+pin. Personally I would go with the first option unless they've done something different like putting the drives on their own rail in which case I might go that route to further spread the load out. |
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ampexperts
Anon
2015-Feb-12 5:26 pm
That would make sense if I can combine 2 or more of the supplemental cables to the GTX580. It has a 14-pin connector on top of the card, near the rear of the unit. My existing 8800GTS only has a six pin connector.
From recollection, there's a 12V supplemental power (four pin molex) to the motherboard, and an eight pin connector opposite that corner of the mobo, by the CPU. Then I have a six pin going to the GPU. I'm not sure until I open the case, but I think there's a spare 4 pin connector tie wrapped off for future use. If that's true, then I can probably connect both 6 and 4 pin 12 volt connectors to the GPU and maybe I'll have enough power.
Here is what EVGA recommends for systems with it's GTX 580. Minimum of a 600 Watt power supply. (Minimum recommended power supply with +12 Volt current rating of 42 Amps.) An available 6-pin PCI-E power connector and an available 8 pin PCI-E power connector |
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JoelC707 Premium Member join:2002-07-09 Lanett, AL |
JoelC707
Premium Member
2015-Feb-12 5:53 pm
That's not a 14-pin connector, it's two separate connectors: one 6-pin and one 8-pin. Do not attempt to connect the CPU 4 or 8-pin connectors to the GPU (they shouldn't connect anyway due to different keyways). Your PSU, if it's the one you listed should have two 6-pin connectors. Just get one of the adapters I listed previously (I would recommend the first one, the 6-to-8 adapter) and you will be just fine. |
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ampexperts
Anon
2015-Feb-12 6:17 pm
Just curious..if all of the 12V and ground connections on that connnector are paralleled, isn't this adapter rather meaningless? If you're taking 3 pairs of wires and Y'ing them to 4 pairs, you haven't increased the current capacity at all. But you have increased contact resistance by adding another level of contact points between PSU and GPU. It doesn't make sense to me, from an engineering viewpoint to use this adapter. |
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JoelC707 Premium Member join:2002-07-09 Lanett, AL |
JoelC707
Premium Member
2015-Feb-12 6:24 pm
I honestly don't know the reason for the 8-pin connector because the additional pins are just ground pins, not positive. The downside is the connector is keyed such that the 6-pin won't just plug into the 8-pin socket. |
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ampexperts
Anon
2015-Feb-12 6:42 pm
So the keying is the problem and this adapter "cheats" by making it possible to physically plug in.
Looking at it with the ohmmeter, only the outer pins appear to be connected on the 6 pin jack. The middle pin shows 11.9k of resistance. On the opposing row, all three pins are connected.
But the 8-pin connector is more peculiar. Only the first two, and last pin are connected. The 3rd pin is open circuit. On the opposing row, I measure 11.9k between all of the pins. No direct connections between the connector groups, except for what is probably the ground side.
I suppose it is safe to say that this card will not work properly without both 8 and 6 pin connectors begin hooked up. But my supply only has the six pin. The adapter can take that up to 8 pins, but there's still a six pin connection on the GPU that needs to be dealt with. |
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JoelC707 Premium Member join:2002-07-09 Lanett, AL |
JoelC707
Premium Member
2015-Feb-12 7:09 pm
Again, according to the specs of your PSU, you should have TWO 6-pin connectors. With that adapter you should have everything you need. I've never ohm'd out the connector to know what is or isn't connected, I'd have assumed they would all be connected. |
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wutsinterweb3End Citizen's United Premium Member join:2014-08-26 USA 1 edit |
to JoelC707
Actually, one of those additional black lead connectors was intended for "sense". You need to connect all connectors for, if no other reason, continuity. The idea was that, generally, an SMPS with an 8 pin PEG connector could handle a greater load than a SMPS with a 6 pin PEG connector. DO NOT attempt to connect the EPS connector to the video card, whatever you do. Yes, they look similar, but they are keyed differently and wired differently. Also, yellow wires are 12VDC, Red and Orange are 5 and 3.3 IIRC (I might have them backwards) the colors of the wires mean something. Black is Chassis common/ground. You can easily find sites that explain the different connectors and voltages/signals on them, just google it. Just don't confuse an EPS with a PEG, yes, they are keyed differently, but a determined person might try to force things and it would be a disaster. There are better sites, but here's an example: » www.smpspowersupply.com/ ··· uts.htmlAs you can see, green is power supply on and purple is stand by voltage 5 VDC. This is all ATX specification. Some old OEM units didn't follow the ATX Spec (Dell etcetera liked to be a PITA to force you to buy their crap). |
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JoelC707 Premium Member join:2002-07-09 Lanett, AL |
JoelC707
Premium Member
2015-Feb-12 10:04 pm
Was this intended for me or the OP? I did not know one of the black leads on the 8-pin PEG connector was intended for sense. Did that actually make it into the spec or is it just connected to ground currently? If it's actually working as intended, I suspect the 6-to-8 pin adapters won't work or wont provide full power (and as such the card will be underpowered). |
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wutsinterweb3End Citizen's United Premium Member join:2014-08-26 USA |
I read that years ago on jonnyguru's site. I don't think it was implemented, but one of the two black leads was, at least originally, intended for sense. I wasn't speaking to anyone specifically, just sharing what I read years ago when PEG connectors first hit the market. I wish I knew more/knew better/knew anything further... |
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JoelC707 Premium Member join:2002-07-09 Lanett, AL |
JoelC707
Premium Member
2015-Feb-12 10:40 pm
Ahhh OK, that's cool. It was a reply to me and all I'm thinking is "what in my posts made you think I didn't already know that" well, aside from the PEG sense wire, I honestly didn't know about that. Anyway, it's good info in general, thanks! |
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wutsinterweb3End Citizen's United Premium Member join:2014-08-26 USA |
Heh, yeah, I slipped up, meant to reply to "all". Doh! I'm an old man, please forgive my foibles and fillydads. |
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ampexperts
Anon
2015-Feb-13 5:50 am
There sure are some interesting caveates there with that adapter, if this 'sense' connection has any bearing on this particular card.
I'll give the adapter a try and see how it goes.
Have dibs on a GTX680, and wonder if the situation is any better or if connectors are different again? I have two identical (cloned) workstations that I'm upgrading to run Mercury Playback Engine, a part of Adobe's editing suite that uses the GPU cores to handle some aspects of playback and rendering. |
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wutsinterweb3End Citizen's United Premium Member join:2014-08-26 USA |
I don't think it will, I wouldn't worry about the jumper wiring because a number of SMPSs do the same thing. As long as your unit can support the load without being too stressed, you should be good. Good luck. |
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ampexperts
Anon
2015-Feb-18 10:09 pm
The StarTech adapter cable arrived today from Amazon, so I was finally able to install the GTX580.
I note the total load at the wall outlet from my UPS was 1100W before removing the 8800GTS. After installation of the GTX580, total load at the wall outlet increased to 1589W. That's a whopping big increase! Plus, the top of my computer case, which used to be cold to the touch, is now very warm.
I did some rendering in Adobe Premiere CS6. The last render had some CUDA accelerated effects on one of the clips. Two minutes of total video with about 20 seconds having CUDA accelerated sharpening filter on it. About 2 minutes into the render, the system rebooted unexpectedly.
I suspect that the additional load of this card is pushing the power supply to the edge of its limits.
I have a GTX680 en route for my other editing machine. It uses a tad less power, according to the information online about that card. Maybe if that works out better, I'll just switch both machines to 680's. |
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JoelC707 Premium Member join:2002-07-09 Lanett, AL |
JoelC707
Premium Member
2015-Feb-18 11:21 pm
Holy shit! What is on that UPS? That's way more than most residential grade models are rated to handle and getting close to the limit for a 15A household circuit. What device are you using to measure the load with? If it's a Kill-a-watt or similar device, you really need to measure the load of just the computer. |
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wutsinterweb3End Citizen's United Premium Member join:2014-08-26 USA |
to ampexperts
Running a branch circuit close to itsmax load is kinda dangerous, the house wiring inside the walls can get hot. |
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ampexperts to JoelC707
Anon
2015-Feb-19 2:52 am
to JoelC707
This outlet has 10AWG wiring back to the breaker. (30A capacity)
I did have to 'cheat' and change the 30A twist lock plug on the UPS to a 20A standard plug that fits the 20A outlet. I've customarily been monitoring my computer usage to see what's eating the lion's share of electricity here ($600 monthly electric bill here). The Kill-A-Watt P3 has been in constant use here for a few years.
I have two identical workstations (were identical until I put the 580 card in one of them) powered by this one rackmount UPS. It's a new unit to replace one that failed after 12 years of ownership. One is being used exclusively for 3D rendering and video production/editing. The other is a backup to that but also has some more general software on it. So basically, we're seeing the power consumption of two workstations and two 30" IPS monitors. |
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