OCZ 1250W - not enough pci-e connectors

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Loper

Junior Member
Apr 6, 2013
2
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So I bought this PSU - OCZ 1250W, which is fine but I want to make a quad gpu build - i am using 7950´s as the GPU which needs 2x PCI-e. This PSU has only 6 pci-e connectors which is quite lame, because it has so much wattage but you can only connect 3 GPU :| . Is there a solution to this? How can I connect my fourth gpu?

ZX_back_1.jpg
 
lehtv

lehtv

Elite Member
Dec 8, 2010
11,897
74
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Since it is a single +12v rail unit, it's perfectly safe to use molex->pcie adapters to power graphics cards. 104A = 1248W on the +12V is plenty for any ~200 watt per GPU quad GPU setup.
 
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billyevans

Member
Apr 7, 2013
48
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Like the above have said, you can get a 2 molex -> pcie adapter. It's perfectly fine, although might lead to a little bit of case clutter.
 
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Loper

Junior Member
Apr 6, 2013
2
0
0
Is the splitter a safe option for prolonged use? The rig will be running 24/7 so I need it to be reliable. Because it will be 2 cables powering 2 GPUs with the splitter instead of 2 cables to 1 GPU.

Or should i just use the molex-pcie cable? But why the hell is it so short :|
 
lehtv

lehtv

Elite Member
Dec 8, 2010
11,897
74
91
I would rather use molex-PCIe. I'm not sure if there's a limit on how much power can be supplied through one connector output...

Or should i just use the molex-pcie cable? But why the hell is it so short :|
Click to expand...

Why should it be longer? You don't plug it into the PSU, you plug it to the end of the cable.
 
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contrvlr

Junior Member
Feb 5, 2013
22
0
0
Loper said:
Is the splitter a safe option for prolonged use? The rig will be running 24/7 so I need it to be reliable. Because it will be 2 cables powering 2 GPUs with the splitter instead of 2 cables to 1 GPU.
Click to expand...
Safe, yes
You have 6 pcie cables
Use 2 of the cables with the splitters to connect to all 4 cards, then a cable for each card, that way you are not using a splitter alone to power any of the cards ( don't think it would cause a problem if you did )
 
nightspydk

nightspydk

Senior member
Sep 7, 2012
339
19
81
I'm not sure wether I'm out of my dept here, but you should not use them molex thingies. I'm not kidding and maybe with a single rail it does not matter. Just I don't think you should make a habit of it.

Consult anywhere guys really. :)

It's one of them things you learn first. Get a PSU with the connections right. I probably could tell you why a molex is a bad idea some other time. :)


Sorry to be such an ass really, but I'll tell you soon as posibel. Just to much beer today. It is true though. :)
 
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aaksheytalwar

Diamond Member
Feb 17, 2012
3,389
0
76
Ocz psus are crap. They don't give anywhere near their rated wattage. I would be surprised if it lasts Long with prolonged 750watts usage.
 
WilliamM2

WilliamM2

Platinum Member
Jun 14, 2012
2,850
808
136
nightspydk said:
It's one of them things you learn first. Get a PSU with the connections right. I probably could tell you why a molex is a bad idea some other time. :)

Sorry to be such an ass really, but I'll tell you soon as posibel. Just to much beer today. It is true though. :)
Click to expand...

Are you sober yet? I'm curious why the molex adapters are a bad idea.
 
PhIlLy ChEeSe

PhIlLy ChEeSe

Senior member
Apr 1, 2013
962
0
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lehtv said:
What a load of horse manure. The unit maintains very respectable voltages and ripple control even at full power. http://www.techpowerup.com/reviews/OCZ/ZX_1250W/5.html
Click to expand...

When they work, I got a brand new1250 sitting here and it is garbage. The wire harness feels like its some cheap plastic junk, the wires are not flexible at all! Its really a shame, its like they paid a third party company to make the harnesses there the worst I ever seen!!!D:

@ the original poster,
I would consider a different brand, again you want to see this unit before you buy it!!! Google is your friend! I know forums get these units for free then they blow sunshine up the companies skirt to keep the free bee's coming, mean time the consumer is the one who pays! Here's a link if you don't believe me (not that the noobs at new egg know anything).........
http://www.newegg.com/Product/Produc...scrollFullInfo
 
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UNhooked

Golden Member
Jan 21, 2004
1,538
3
81
I think the ZX1250W is made by Great Wall which received nice review by Jonny guru. He reviewed the Sparkle Gold glass 1250w which is also made by Great Wall
 
Torn Mind

Torn Mind

Lifer
Nov 25, 2012
12,052
2,766
136
nightspydk said:
I'm not sure wether I'm out of my dept here, but you should not use them molex thingies. I'm not kidding and maybe with a single rail it does not matter. Just I don't think you should make a habit of it.

Consult anywhere guys really. :)

It's one of them things you learn first. Get a PSU with the connections right. I probably could tell you why a molex is a bad idea some other time. :)


Sorry to be such an ass really, but I'll tell you soon as posibel. Just to much beer today. It is true though. :)
Click to expand...

Extraordinary claims require extraordinary proof. Now, why exactly would a molex connector NOT be suitable for being converted to a PCI-E connector or any other for that matter.
 
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peteyo

Member
Apr 15, 2013
34
0
0
Ok guys, I'm in a similar boat either use molex adapters or get a new psu. I need 6 pcie 6 pin or 3 video cards worth. Any recommendations on a cost effective but decent PSU? Thanks
 
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Sleepingforest

Platinum Member
Nov 18, 2012
2,375
0
76
Molex adapters, my friend, assuming your PSU was good in the first place. What model is it? There's a big difference between a generic crappy PSU's "1250W*" and a high quality PSU's "1250W**" claims.

*1250W: achieves this only one in a hundred units for a second because of crappy parts and QC.

**1250W: Can go over this amount for brief periods of time safely because of excellent engineering.
 
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peteyo

Member
Apr 15, 2013
34
0
0
Ya good point. 950 watt even enough? I don't remember what brand exactly. I will look to see. Either way, any recommendations on a new psu for 3 cards or 6 pcie connectors?
I'm assuming 200 watt per card?
 
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peteyo

Member
Apr 15, 2013
34
0
0
Corsair 950w, i took a look at it last night. Came back to post and anandtech was down for maintenance.
 
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Sleepingforest

Platinum Member
Nov 18, 2012
2,375
0
76
What video card? They consume anywhere from 100-300W. If we're talking about 7970s or 680s, I would feel safer with a 1100W unit.
 
nightspydk

nightspydk

Senior member
Sep 7, 2012
339
19
81
goobee said:
Because the beer told him so? o_O
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Them beers never lie. Anyhow bro its common knowledge. :)

I would expect the first and most common problem is generally ppl thinking they can increase the output of a rail with a splitter. That might not be the case here, but then would you expect the output to decrease with a splitter? I would. I wouldn't want to claim this is a no-go, I'm just saying, the reason why when you read stuff on eg jonnyguru and the recommendation is get a PSU with the right connectors, there is a reason for it and not just that they fit better. :p
 
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pandemonium

pandemonium

Golden Member
Mar 17, 2011
1,777
76
91
Common knowledge? That would be knowing that you do not exceed your rail outputs with the molex > PCI-E adapters. In which case, they're perfectly fine to use.
 
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peteyo

Member
Apr 15, 2013
34
0
0
Well its definitly a corsair 950w, must be an older model. I want to use it to run 3 6950's
 
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