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Some sli/physx and power questions

post #1 of 14
Thread Starter 
As of right now I have 1 570 and another is in the mail for SLI but I also have a gtx 260 in my closet right now. With a corsair AX850 psu can I run 570 sli with the 260 for physx? All will be running stock besides an overclocked 2600k. It does also have x1 140mm fan, x4 120mm fans, x1 230mm fan and a xspc pump. Also does the P8Z68-v pro support this?

Thanks.
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post #2 of 14
With the AX850, you could have three GTX 570s and a 260 as PhysX.

When a card is only processing PhysX and nothing else, it is pulling a very small amount of power.

However, I think it would be a waste of time and energy to have the 260 in there as PhysX because with two 570s in SLI, you'd probably see and feel no difference.
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post #3 of 14
Thread Starter 
Alright I see. Thanks for the input!
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post #4 of 14
Quote:
Originally Posted by Twinkadink View Post
Alright I see. Thanks for the input!
You're very welcome!
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post #5 of 14
It'll work fine, mainly because when a card is used strictly for physX it won't draw nearly the kind of power it would if it was doing rendering.

Personally though I only throw in my physX card when there's a new game out that I'm playing a lot that supports hardware physX. It's not worth the extra heat and power draw the rest of the time, and it takes like 5 minutes tops to put it in or take it out.

A lot of people are going to jump on here and tell you that you don't need a physX card when you have SLI 570's, and while I agree that it's probably not 'worth it' to go out and BUY one, I think if you have a card laying around that you're not really wanting to sell that will make for a great physX card (like a 260) ... it makes sense to deploy it (when playing a game that supports hardware PhysX) rather than have it sitting around gathering dust.

Something to keep in mind about running physX on an SLI set ... physX will only run on one card. However, in SLI, both cards need to render at the same speed. So what ends up happening is that the card that's not running physX will have to 'wait' on the card that is doing the physX. This will have the net effect of the physX load 'double-dipping' on your performance.

Put another way, if the physX processing would require 20% of one cards resources, then it requires 20% of both cards resources, not 10% each like it would if the physX load could be split between the two cards.

Really though there's only three games out right now that will actually benefit from the physX card, given your current setup: Alice: Madness Returns, Batman AA, and Mafia 2. Those are the only ones where the physX load and the rendering piece are remotely tough enough to challenge SLI570's in the slightest. Eventually there may be more though
Edited by brettjv - 7/31/11 at 12:57pm
    
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by brettjv View Post
It'll work fine, mainly because when a card is used strictly for physX it won't draw nearly the kind of power it would if it was doing rendering.

Personally though I only throw in my physX card when there's a new game out that I'm playing a lot that supports hardware physX. It's not worth the extra heat and power draw the rest of the time, and it takes like 5 minutes tops to put it in or take it out.

A lot of people are going to jump on here and tell you that you don't need a physX card when you have SLI 570's, and while I agree that it's probably not 'worth it' to go out and BUY one, I think if you have a card laying around that you're not really wanting to sell that will make for a great physX card (like a 260) ... it makes sense to deploy it (when playing a game that supports hardware PhysX) rather than have it sitting around gathering dust.

Something to keep in mind about running physX on an SLI set ... physX will only run on one card. However, in SLI, both cards need to render at the same speed. So what ends up happening is that the card that's not running physX will have to 'wait' on the card that is doing the physX. This will have the net effect of the physX load 'double-dipping' on your performance.

Put another way, if the physX processing would require 20% of one cards resources, then it requires 20% of both cards resources, not 10% each like it would if the physX load could be split between the two cards.

Really though there's only three games out right now that will actually benefit from the physX card, given your current setup: Alice: Madness Returns, Batman AA, and Mafia 2. Those are the only ones where the physX load and the rendering piece are remotely tough enough to challenge SLI570's in the slightest. Eventually there may be more though
Ah alright. I see. Appreciate it.
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post #7 of 14
Let me answer your final question regarding the motherboard's support.

Your Asus P8Z68-V Pro does support 2-way SLI plus a Physx card. Just use the blue and white slots for the two GTX570s and use the black slot for the GTX260. In this setup, it will be x8/x8/x4. Although the GTX260 only runs on x4, this will only have around 5% performance loss because it is running as a dedicated Physx card. Even as such, its presence will substantially boost the framerate in Physx games like Mafia II.

One last note: when you do setup this GTX260 on the black slot (PCIe x16_3), make sure you make the necessary change in the BIOS because:
Quote:
The PCIe x16_3 slot shares bandwidth with PCIe x1_1 slot, PCIe x1_2 slot, USB3_34 and eSATA. The PCIe x16_3 default setting is in x1 mode.
post #8 of 14
Thread Starter 
Quote:
Originally Posted by windfire View Post
Let me answer your final question regarding the motherboard's support.

Your Asus P8Z68-V Pro does support 2-way SLI plus a Physx card. Just use the blue and white slots for the two GTX570s and use the black slot for the GTX260. In this setup, it will be x8/x8/x4. Although the GTX260 only runs on x4, this will only have around 5% performance loss because it is running as a dedicated Physx card. Even as such, its presence will substantially boost the framerate in Physx games like Mafia II.

One last note: when you do setup this GTX260 on the black slot (PCIe x16_3), make sure you make the necessary change in the BIOS because:
So I'll have to change it from 1x to 4x?
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post #9 of 14
Quote:
Originally Posted by Twinkadink View Post
So I'll have to change it from 1x to 4x?
Yes.
I think you have to change from 'Auto' to 'x4' (where 'Auto' is just default x1).
See the two pics below.


Edited by windfire - 7/31/11 at 6:22pm
post #10 of 14
On the subject, what happens if you have a physX plugged in, but unplug the power jacks from the card? I have a watercooled gtx 260 c216 I plan on using for physX. I know I'll be playing a ton of arma 3, so I'm definitely keeping it for that. But it would be a pain to remove / put it in due to the watercooling. I'd rather just keep it in from the time I set up water on the gtx 480 I just got. Would it be cool to just leave the card there but unplug it from the psu?
    
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