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[solved] GTX 460 SLI top card runs very hot - Page 4

post #31 of 48
Thread Starter 
@jed what do u mean by behind the cards?
btw i think imma just buy some TIM tomorrow, take off the shroud and super glue the fan to the heatsink.
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post #32 of 48
A. Without a pic showing the rear of your PC, let me give some general advice:-

i. your case should be, preferably, at least 6'' away from the wall so that exhausted air will not get accumulated in the zone easily. Hot air will be dissipated by natural convection.

ii. a further step to (i) above is to position a small fan (eg pic 1 below) to actively ventilate that area. My experience is a drop of 2-3C can be achieved easily if the fan is positioned well

iii. yet another step to (ii) above is to mount a fan to the rear of the case (directly behind the exhaust openings of the 2 cards). see pic 3 below for the idea. This fan is to actively assist the exhaust of a card by sucking air out.

B. As for the side panel fan, 120mm fans of 12mm or 20mm thick are available but I do not recommend them as the air velocity is relatively not as high as a smaller fan.
Thinner 120 fan: http://www.performance-pcs.com/catalog/index.php?main_page=index&cPath=36_408&zenid=e64a83cf924dc8f68cec43207a815d25
80mm fan eg: http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=36_37_880&products_id=28453

See pic 2 for a better drawing of the DIY paper funnel.


C. If you remove the shroud and super-glued a fan:-

i. the thickness of that fan is a limiting factor. Using Galaxy' stock fan only gives a 2mm gap. So, I imagine the new fan cannot be more than 12mm thick (?), leaving you not many choices, of which many are probably too weak.

ii. a new challenge arises because hot air will be dispersed, in the absence of the guidance of the shroud, in many more directions (vs going simply in 2 directions-forward and backward). This means, hot air is dumped more into and around the case. This has the non-desirable potential of recirculating the hot air.
But if this is the route, this link is a good reference. It shows a 120x25 fan fitted onto the heatsink. http://www.szgalaxy.com/zh-cn/newsview.aspx?id=510
Edited by windfire - 2/24/11 at 10:58pm
post #33 of 48
Im always amazed that people don't consider the fact that there is usually very little room between cards and are surprised when they get a temp spike from the top card...But I overthink everything anyway.

The 460 has a max temp of 104C. If your top card is below 95 under load you have nothing to worry about. But I understand how annoying seeing a High (albeit harmless) temp.
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post #34 of 48
Thread Starter 
Quote:
Originally Posted by windfire;12517508 
A. Without a pic showing the rear of your PC, let me give some general advice:-

i. your case should be, preferably, at least 6'' away from the wall so that exhausted air will not get accumulated in the zone easily. Hot air will be dissipated by natural convection.

ii. a further step to (i) above is to position a small fan (eg pic 1 below) to actively ventilate that area. My experience is a drop of 2-3C can be achieved easily if the fan is positioned well

iii. yet another step to (ii) above is to mount a fan to the rear of the case (directly behind the exhaust openings of the 2 cards). see pic 3 below for the idea. This fan is to actively assist the exhaust of a card by sucking air out.

B. As for the side panel fan, 120mm fans of 12mm or 20mm thick are available but I do not recommend them as the air velocity is relatively not as high as a smaller fan.
Thinner 120 fan: http://www.performance-pcs.com/catalog/index.php?main_page=index&cPath=36_408&zenid=e64a83cf924dc8f68cec43207a815d25
80mm fan eg: http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=36_37_880&products_id=28453

See pic 2 for a better drawing of the DIY paper funnel.


C. If you remove the shroud and super-glued a fan:-

i. the thickness of that fan is a limiting factor. Using Galaxy' stock fan only gives a 2mm gap. So, I imagine the new fan cannot be more than 12mm thick (?), leaving you not many choices, of which many are probably too weak.

ii. a new challenge arises because hot air will be dispersed, in the absence of the guidance of the shroud, in many more directions (vs going simply in 2 directions-forward and backward). This means, hot air is dumped more into and around the case. This has the non-desirable potential of recirculating the hot air.
But if this is the route, this link is a good reference. It shows a 120x25 fan fitted onto the heatsink. http://www.szgalaxy.com/zh-cn/newsview.aspx?id=510

first off thank you for a very lengthy and informative post. +rep
i. yes the back of my case is about 15" from the wall.
ii. hey i got that same fan! imma use it now.
iii. yea that sounds like a nice idea. i think i'll try to superglue a fan to the back of my case or something and then route cable inside.

I think you misunderstood. I will only remove the plastic part, the metal heatsink part will stay the same. the same fan will be glue to the metal heatsink. it's kinda like MSI cyclone cooler only uglier cool.gif

It's completely fine if the card dump hot air around my case. I've got 200mm +120mm exhaust fans, and 2 120mm intake fans. you know the antec 900 and it's reputable airflow. so the hot air will not be a problem.
btw that thread is nice. that fan mod is nice although it won't fit in my situation. although that's my general plan for removing shoud.
i only want the top card to have more room to suck in air, that is why i'm considering removing the shoud.
i'm going to do exactly waht that guy in that thread did tomorrow. I can always mount the shoud back on if temp get worse or doens't change.
Quote:
Originally Posted by PhilWrir;12517562 
Im always amazed that people don't consider the fact that there is usually very little room between cards and are surprised when they get a temp spike from the top card...But I overthink everything anyway.

The 460 has a max temp of 104C. If your top card is below 95 under load you have nothing to worry about. But I understand how annoying seeing a High (albeit harmless) temp.

well my temp is not below 95. it goes 96-98 mostly stay at 98 under load when playing crysis. and i don't play crysis for a few minutes, i usually play for 1.5-2 hours so it stays 98 C for that long. that is why i'm worried smile.gif
Edited by james8 - 2/24/11 at 11:57pm
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post #35 of 48
put a aftermarket cooler on 1st card ?
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post #36 of 48
im unsure.. but if thats a reference cooler doesnt the shroud do little for air guidance? removing the plastic shroud assuming the fan is not attatched to it could improve it greatly in theory, as its the shroud blocking the airflow

Just a thaught,

Edit: nevermind spotted this was allready suggested
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post #37 of 48
soulution buy a 3way sli board and use 2 cards leave u a full space between my card dont go over 70c in load idle at 33c and they are overclocked gtx260 core 216s which had heat issues anyway
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post #38 of 48
Don't do an 80mm, make a 120 work. 80s have smaller spread and make alot of noise.
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post #39 of 48
side fan blowing air in, or change your choice of 460's i hate those kind of cards that are all covered up in taccy plastic, they dont dissipate heat. Should have gone MSI Twin frozr or Asus DirectCU
post #40 of 48
Thread Starter 
thanks for all the suggestions guys.
i just spent 1 hour modding the card. "tacky" plastic is gone smile.gif
100_1475.jpg
currently waiting for the superglue on the fan to dry. that may pose a problem.
can't wait to test this.
Edited by james8 - 2/25/11 at 9:48am
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