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Optimal SLI Positioning? - Page 2

post #11 of 20
Thread Starter 
Quote:
Originally Posted by coelacanth View Post
With your motherboard, which card will be the "#1" card. I'm guessing it's the top card on your mobo, so it's always going to run hotter anyway. I'd probably put the DirectCU card above the Cyclone. If you're patient, test out both setups.

If you manage to move the PSU, will you get 16x / 16x if you use the top and bottom PCI-E slots?
It will be 16x/8x I believe. I think 8x is about a 2-4% performance loss, which can easily be accounted for with increased overclock potential from lowering temps I think..
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post #12 of 20
In addition to moving the PSU to the top of the 932, there is another thing you can try.

It is a relatively little known trick to this issue:-
The top card is hotter because its air intake is mostly blocked by the bottom card. This is one reason. Another reason is that it is usually connected to the monitor, thus making it the 'main' card. The main card gets to work a little bit more than the other card and so it gets a little hotter for this reason.

So, you can try to connect the monitor to the bottom card of the SLI pair. This trick might bring down the temperature of the top card to a more acceptable level. Try it before doing anything else.

I hope this helps.
post #13 of 20
Quote:
Originally Posted by BlahBlahBlah View Post
It will be 16x/8x I believe. I think 8x is about a 2-4% performance loss, which can easily be accounted for with increased overclock potential from lowering temps I think..
The performance loss is probably even less than that,i actually have not noticed a difference at all.
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post #14 of 20
Thread Starter 
Quote:
Originally Posted by windfire View Post
In addition to moving the PSU to the top of the 932, there is another thing you can try.

It is a relatively little known trick to this issue:-
The top card is hotter because its air intake is mostly blocked by the bottom card. This is one reason. Another reason is that it is usually connected to the monitor, thus making it the 'main' card. The main card gets to work a little bit more than the other card and so it gets a little hotter for this reason.

So, you can try to connect the monitor to the bottom card of the SLI pair. This trick might bring down the temperature of the top card to a more acceptable level. Try it before doing anything else.

I hope this helps.
That is a very interesting idea..I know that the top card is "supposed" to be the main card, but I will try this and see if it works!
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post #15 of 20
Quote:
Originally Posted by BlahBlahBlah View Post
That is a very interesting idea..I know that the top card is "supposed" to be the main card, but I will try this and see if it works!
I have seen various results with this trick, from 2C to 10C lowering. I expect yours might be somewhere in between these 2 numbers.

In addition, even if you finally put the bottom card to the bottom PCIe slot, I would still suggest you to setup an additional fan. Its primary function is to push air into the gap between the 2 cards (even more so needed if the 2 cards do not have an empty slot in between). Just relying on the card's fan itself to suck air through such a narrow gap is not effective enough.

To this end, I suggest you can zip-tie a 120mm fan to the rear of the HDD cage of the 932, pointing it directly to the gap between the cards (read my post #12 here: http://www.overclock.net/air-cooling...uestion-2.html). This fan can also help to increase the forward air velocity (because the 932's front 230mm fan has a large CFM but air velocity is low).

Alternatively, you can use something like an Antec Spot Cool to get much closer to the gap (see the pic below for the idea-notice the Spot Cool at the very Right Hand Side of the pic. It is responsible for pushing air into the gap).
post #16 of 20
Quote:
Originally Posted by windfire View Post
In addition to moving the PSU to the top of the 932, there is another thing you can try.

It is a relatively little known trick to this issue:-
The top card is hotter because its air intake is mostly blocked by the bottom card. This is one reason. Another reason is that it is usually connected to the monitor, thus making it the 'main' card. The main card gets to work a little bit more than the other card and so it gets a little hotter for this reason.

So, you can try to connect the monitor to the bottom card of the SLI pair. This trick might bring down the temperature of the top card to a more acceptable level. Try it before doing anything else.

I hope this helps.
I actually tried this and it did make a 2-3C difference, but for whatever reason the monitor didn't always get a signal at bootup.
    
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post #17 of 20
Quote:
Originally Posted by Bluemustang View Post
I actually tried this and it did make a 2-3C difference, but for whatever reason the monitor didn't always get a signal at bootup.
I believe this has to do with a setting in the BIOS of your Gigabyte X58A-UD3R.

Pages 51 and 52 of the User Manual (see the 2 pics below):
You need to specify the PCIE slot (which contains the card which is connected to the monitor) as the first display.

Edit #1: a word of apology to the OP...not meaning to take this thread off topic


Edited by windfire - 2/17/11 at 5:59pm
post #18 of 20
Quote:
Originally Posted by BlahBlahBlah View Post
That is a very interesting idea..I know that the top card is "supposed" to be the main card, but I will try this and see if it works!
Some motherboards make the bottom card the main card. Makes sense, seeing as how the top card is going to get hotter with another card right below it anyway.
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post #19 of 20
Thread Starter 
Quote:
Originally Posted by coelacanth View Post
Some motherboards make the bottom card the main card. Makes sense, seeing as how the top card is going to get hotter with another card right below it anyway.
Indeed, I think my motherboard in particular has the master slot as the upper one, but I still need to test a bit more.

I have made it through a few Vantage runs now (Performance setting) at 875/2000 overclock, GPU score coming in around 30.1k. Temperatures have been better lately as I clean up wiring and fine tune a few things inside the case.

Once my new (longer) SLI bridge comes in, I am going to move one of the cards down into the 3rd slot (probably the ASUS because it is shrouded and won't be interfered with by the random wires running into the bottom slots in my mobo) and that should help temps further.

I am missing the top fan that I had to remove to top mount the PSU, I am going to try to figure out a way to mount a 120mm up there. On a side note, I moved the big fan from the top to the bottom where the PSU was.

I am planning to mount a 120mm fan outside the HDD cage like someone suggested to give the cards some more air flow as well, just need to find one laying around.

TL;DR: Things are coming together, adding more airflow!
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post #20 of 20
Glad to hear your setup is coming together. I had to move my PSU to the top to fit a 2nd card in the bottom slot as well. The cards get good airflow from the bottom intake fan (psu opening) and the HD bay fan. Once I added the fan shroud to the HD Bay fan the temp difference between the cards was cut in half.
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