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GTX 465 SLI Question (Heat and Setup Related)

post #1 of 9
Thread Starter 
Hello all, fairly new to the forums (although ive been a member for quite some time).

Just figured id start being active on the forums and I found the perfect place to start!

The sig rig is the PC im talking about, and id like advice on the following 2 questions. (Regarding 2 GTX 465's in SLI)

1. Im using an FTW3, and I have the cards neck and neck to keep them both at x16 instead of skipping a slot and having x16 x8.
Is there any way to use the 3rd slot and still keep it at x16? My cards are not touching but they are extremely close together, and I see it all the time in case pictures and such, I just wanted to know because of heating issues (which is my next question)

2. My primary GPU during my games (not even a full load id assume because this is Counter-Strike:Source and Guild Wars, I have yet to Install bad company 2), will spike up to an upwards of 86-95 degrees Celsius, now im sure it is because of the 2nd card and the fact that they are basically sandwiched together. I also have read through the acceptable temperatures thread and confirmed that my cards are pretty close to the unsafe area (going to assume BC2 can push them much much farther than CS:S and GW).

If I am going for aesthetics and don't want to take my case panel off, would an antec spot cooler fan give me any decrease in temperatures? or would my best option be to increase the fan speed in EVGA Precision? Any advice would be appreciated and I can supply as much information as needed.

I have attached a picture of my setup below! Thanks again!



Uploaded with ImageShack.us
post #2 of 9
You won't lose any fps if you switch the 2nd card to the X8 slot as X8 will be enough bandwidth for it - even 480/580's have a hard time fully saturating X16 slots. You will lose a lot of heat by changing the spacing though which could possibly help with o/c'ing

While those are acceptable temperatures, you could have better temperatures if they aren't sandwiched - of course if you really want them together you can turn up the fan speed, though I'm not sure why you would chose more noise and heat vs. simply spacing them out with no loss in performance (and potentially better performance if you o/c them higher because of the reduced heat)
Edited by appleg33k85 - 6/21/11 at 7:07am
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post #3 of 9
http://www.hardocp.com/article/2010/...16x16_vs_x16x8
Quote:
Gameplay performance can be summed up very easily and directly. We experienced no differences in the gameplay experience between x16/x16 SLI or CFX compared to x16/x8 SLI or CFX.
post #4 of 9
Thread Starter 
Thank you both for the input! Ill be throwing that 2nd card into the 8x slot when i get home!

Appreciate all the help!

I miss my single GTX 480 =[ But Im pretty sure these SLI'd 465's will beat out the single card so I am content! This is also my first ever SLI setup so we will see how much we can OC these bad boys!
post #5 of 9
8x = AGP lol 16x = PCI-E .. I'm sure they didn't just double the bandwidth for the pretty new slot size.

Honestly, video cards with reference coolers now are sold to run between 80-95c in SINGLE video card configs nowadays.

I recommend you upgrade the heatsinks on those cards. There are full cover heatsinks for like 60 bucks on the egg.

Oh yea, just to clarify there IS an FPS drop from using 8x over 16x. I just tested it personally with a funked up slot on my old WS revolution before the RMA. Your overclock should be able to make up for these lost fps though without trouble.
Edited by RyanRacer48 - 6/21/11 at 7:26am
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post #6 of 9
Quote:
Originally Posted by RyanRacer48 View Post
8x = AGP lol 16x = PCI-E .. I'm sure they didn't just double the bandwidth for the pretty new slot size.

Honestly, video cards with reference coolers now are sold to run between 80-95c in SINGLE video card configs nowadays.

I recommend you upgrade the heatsinks on those cards. There are full cover heatsinks for like 60 bucks on the egg.
Dude, the bandwith of AGP x8 is not the same as PCIe x8.
     
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post #7 of 9
You missed the sarcasm
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post #8 of 9
My advices:-

1. Move your 2nd GTX465 to the 3rd PCIex16 slot. Even though this means x16/x8, this only brings a performance loss of about 2% at your resolution. If it is 100fps now, it will be 98fps. If it is 30fps now, it will be 29.4fps. Practically nothing, IMHO. So, if you are a gamer and not a benchmarker, I suggest to take this negligible fps reduction in favour of the two extra slots in between for better ventilation. See pic 1 below.

x8 vs x16:http://www.techpowerup.com/reviews/N...caling/24.html

2. According to page 31 of FTW3 manual, the 3rd slot is always at x8. There is no way to make it work at x16. See pic 2 below. One trick is to use a riser ribbon card in 2rd slot to physically move the 2nd GTX465 further away. This will let you use the x16 of 2nd slot. But this brings other concerns which I do not think justify this move.

3. Even with the 2nd GTX465 at the 3rd slot, I would suggest you to use MSI Afterburner (or Precision) to setup custom fan profile to bring up the speed of the fans more aggressively.

4. As the 2nd GTX465 is in the 3rd slot, it gets close to the PSU below. I suggest to setup a (120mm) fan right in front of the 2 cards. Perhaps an Antec Spot Cool is sufficient. Your attached pic is so small and I cannot it clearly. If the PSU has its fan facing up, this additional fan becomes more important as it is needed to supply air to the PSU as well.

post #9 of 9
Thread Starter 
My fan is on the bottom because i cut out a section in the bottom of my case to keep it well ventilated. The only reason i have this antec 300 is because the setup is new and when i parted out my old system i sold my corsair 800D. I will be buying anither shortly.



And yes I am more of a gamer than a benchmarker and even though i play all my games at 1920x1080 a 2 or even 5% decrease in fps won't kill me. After reading that hard ocp article and reading the responses ill be moving the 2nd card over to the 8x slot. This setup is also temporary until I can sell both cards and afford a nice 580 or 590. But thanks again for all of the advice! Ill be posting my oc results soon as well!


Forgive the grammer this is beingtyped from my anroid
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