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post #101 of 120
Quote:
Originally Posted by Tator Tot View Post
The PSU doesn't change that limit. It's a physical limit which stays constant.

So if the OCP Set Point is 25A on a one of the 12v rails then it's always going to be that.

You must consider this though; on most PSU's with multiple 12v rails; specific rails are given a specific job.
IE:
12v 1 = Motherboard / ATX 24pin connector
12v 2 = EPS/ATX 12v 4+4pin connector
12v 3 = PCIe 6pin + PCIe 8pin
12v 4 = SATA/Molex

That right there is your pretty standard setup and offers more than enough wattage on each rail as 25Ax12V=300W
300w is the PCI-PEG limits for PCIe devices in power draw.

So with that OCP limit you have the ability to draw 300w through any of those sources.
Quote:
Originally Posted by DuckieHo View Post
OCP shuts down your PSU if the limit is passed.

A PSU with 12@32A might have two rails with OCP set at 18A. If the PSU hits more than 18A on either rail, the PSU shutdown.
Thats the point, shutting down is the problem.

But I dont think the PSU will be shut downed, that will lead to the card performing poorly and its a problem too.

Say my PSU 12V rails are distributed like this:

12V1: EPS/ATX12V
12V2: Peripheral and Sata
12V3: Mobo 24 pins connector + 2 x6/8 pin connector.
12V4: 2x6/8 pin connector

OCP Set point for each 12V rail is 18A

my GTX 285 uses 12V3.
my GTX 480 uses 12V4

that means my system will draw about 75W (GTX 480)+75W (GTX 285)+75Wx2 (GTX 285) = 300W (25A) from the 12V3 rail. This when I need to plug the EVGA adapter into a connector of the 12V2 to power my cards.

Even if OCP set point is 25A, I'd still do it.
Edited by ih2try - 12/22/10 at 10:41am
    
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post #102 of 120
Quote:
Originally Posted by ih2try View Post
Thats the point, shutting down is the problem.

But I dont think the PSU will be shut downed, that will lead to the card performing poorly.

Say My PSU 12V rails are distributed like this:

12V1: EPS/ATX12V
12V2: Peripheral and Sata
12V3: Mobo 24 pins connector + 2 x6/8 pin connector.
12V4: 2x6/8 pin connector

OCP Set point for each 12V rail is 18A

my GTX 285 uses 12V3.
my GTX 480 uses 12V4

that means my system will draw about 75W (GTX 480)+75W (GTX 285)+75Wx2 (GTX 285) = 300W (25A) from the 12V3 rail. This when I need to plug the EVGA adapter into a connector of the 12V2 to power my cards.
What are you talking about? OCP will shutdown the PSU when the current is exceed hence the name Over-Current Protection. If it doesn't, then it does not have OCP and is not a virtual rail. Has your PSU ever shutdown while under heavy load? If no, then you never exceeded OCP limits.

What do you mean the card performing poorly? All +12v rails come from the same +12v source on that PSU. If your card is unstable due to the power delivery, then there is something wrong with the PSU itself.



Your video cards don't draw all avaliable power.
Edited by DuckieHo - 12/22/10 at 10:50am
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post #103 of 120
Quote:
Originally Posted by ih2try View Post
Thats the point, shutting down is the problem.

But I dont think the PSU will be shut downed, that will lead to the card performing poorly.
No.... it protects your system from damages that may occur....

Quote:
Originally Posted by ih2try View Post
Say my PSU 12V rails are distributed like this:

12V1: EPS/ATX12V
12V2: Peripheral and Sata
12V3: Mobo 24 pins connector + 2 x6/8 pin connector.
12V4: 2x6/8 pin connector

OCP Set point for each 12V rail is 18A

my GTX 285 uses 12V3.
my GTX 480 uses 12V4

that means my system will draw about 75W (GTX 480)+75W (GTX 285)+75Wx2 (GTX 285) = 300W (25A) from the 12V3 rail. This when I need to plug the EVGA adapter into a connector of the 12V2 to power my cards.

Even if OCP set point is 25A, I'd still do it.
3 things:
1.) That Rail distribution would not be used on any modern PSU.
2.) You wouldn't need to plug in the EVGA Adapter then. You most likely wouldn't draw that much power from the ATX 24pin plug.
3.) your GTX 285 & GTX 480 are not going to be drawing anywhere close to 300w each.
The GTX 285 will be close to, 200w draw
The GTX 480 will be around 250w draw
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post #104 of 120
@Tator Tot: I'm talking about PSU in general, not only the modern ones. My Antec 850 distributes 12V rail that way.

The GTX 285 and 480 are just examples. I believe there are always ways to make some vga draw that much power, like with a customized vga that has 2x8pin connectors or with overclocking, stressing.

Now, tell me, if my example is true, then this adapter will be useful for it, right ?

@DuckieHo: I heard a lot of people complaining about their vga performing poorly (fps drop) and that problem comes from distributing in a bad way. I'm not arguing over PSU shutting down or not, though. My point is, for my example, with that adapter, u dont exceed OCP limit, without it, you will.
Edited by ih2try - 12/22/10 at 11:13am
    
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post #105 of 120
Quote:
Originally Posted by ih2try View Post
@Tator Tot: I'm talking about PSU in general, not only the modern ones. My Antec 850 distributes 12V rail that way.

The GTX 285 and 480 are just examples. I believe there are always ways to make some vga draw that much power, like with a customized vga that has 2x8pin connectors or with overclocking, stressing.

Now, tell me, if my example is true, then this adapter will be useful for it, right ?
Your Antec doesn't use those OCP limits provided though.

You can make them draw more power; but some of those GPU's throttle based on power draw; this has nothing to do with the CPU.

The Adapter still would not be useful then.

The adapters use is going to be for when you have a board that does not have power adapters on the board to supply extra power to the PCIe slots.


Quote:
Originally Posted by ih2try View Post
@DuckieHo: I heard a lot of people complaining about their vga performing poorly (fps drop) and that problem comes from distributing in a bad way. I'm not arguing over PSU shutting down or not, though. My point is, for my example, with that adapter, u dont exceed OCP limit, without it, you will.
GPU's throttle based on power draw set by the card; not by an OCP Set Point on the PSU.
They also throttle based on temps.

This throttling has nothing to do with supplied power though. They'll throttle on any PSU layout.
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post #106 of 120
Quote:
Originally Posted by ih2try View Post
@Tator Tot: I'm talking about PSU in general, not only the modern ones. My Antec 850 distributes 12V rail that way.

The GTX 285 and 480 are just examples. I believe there are always ways to make some vga draw that much power, like with a customized vga that has 2x8pin connectors or with overclocking, stressing.
Overclocking generally won't hit the OCP.

However, extreme overclocking and the use of adapters is non-standard use of the PSU and all types of limits may appear.

Quote:
Originally Posted by ih2try View Post
@
@DuckieHo: I heard a lot of people complaining about their vga performing poorly (fps drop) and that problem comes from distributing in a bad way. I'm not arguing over PSU shutting down or not, though. My point is, for my example, with that adapter, u dont exceed OCP limit, without it, you will.
Nope. They don't know what they are talking about.
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post #107 of 120
So, is this what happened to my poor PSU?

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post #108 of 120
Quote:
Originally Posted by Crazy9000 View Post
So, is this what happened to my poor PSU?
It's possible, what PSU was it, and what was it powering?
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post #109 of 120
Quote:
Originally Posted by Tator Tot View Post
It's possible, what PSU was it, and what was it powering?
http://www.newegg.com/Product/Produc...82E16817171022

My rig, with a perc raid card in addition to the graphics.
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post #110 of 120
Quote:
Originally Posted by Crazy9000 View Post
http://www.newegg.com/Product/Produc...82E16817171022

My rig, with a perc raid card in addition to the graphics.
I don't think it was your GPU pullin to much from the slot; if anything your PSU probably would have shut down if that was the case because it's low OCP set-points and the fact that the EPS12v & ATX 24pin are on that line (12v1.)

I couldn't say for sure what exactly happened, but it's possible that the pins were heavily loaded for awhile and started to melt causing the rest to go; but still highly unlikely.
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