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Better Cooling for the 7800GTX - Page 13

post #241 of 416
1/22/06 at 9:18pm
Thread Starter 
Quote:
Originally Posted by Doc.Caliban
I don't know, the AS5 people get really anal about even microscopic contamination effecting the cooling properties of AS5.
I think that's to scare neophytes into being extra careful so they dont stick a finger print on the middle of the core. I still use a plastic bag to put the shim on, but a little bit of print on the sides of the shim wouldn't matter.
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post #242 of 416
1/22/06 at 9:20pm
Plastic baggies!!! Same here! Screw that static crap
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post #243 of 416
1/22/06 at 10:16pm
its kick myself in the arse time...

the other day I took off the blue foam spacers to see if the heatsink would get closer, well it did but I put them back on now

what I found was I got artifacts at high temps ie after playing fear for over an hour

I think the foam (which is an insulator) just prevents conductive heat down from the core cooked heat sink to the ram chips - so the core throws out much more heat than the ram does, and it looks like what ram heat there is goes out convective sideways and the ram is happy

...unless of course its conductive foam and in that case its the opposite. lol

"..if your not falling your not learning.." like my ski instructor said
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post #244 of 416
1/22/06 at 10:23pm
Thread Starter 
Ironically, it is the opposite. That foam, while mediocre at best, is conductive and does transfer heat to the aluminum heatsink. You must remember that most of the heat that the core produces is taken up by the heatpipes and whisked away to the fins.
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post #245 of 416
1/22/06 at 10:26pm
What about something like this?

http://www.koolance.com/shop/product...roducts_id=129

Assuming there's enough clearance for them to fit (and you could file them down if they don't) these are cool little aluminum stick-on heatsinks. I used them on my 9800 a couple years ago and they worked pretty well.

-Doc
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post #246 of 416
1/22/06 at 11:45pm
These fans i'm using are giving me almost 10c drop in temps when running 3d mark06 in 1440x900 resolution. I ran the demo without the fans and i got 92c constant. With the fans i get 80-82c. That's with an oc of 440c1200m with stock Dell heat pad. That is pretty good yes?



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post #247 of 416
1/22/06 at 11:53pm
Where did you get those fans, Celtic? They look very nice
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post #248 of 416
1/22/06 at 11:55pm
i got them here....


http://www.microcenter.com/single_pr...uct_id=0209207

Although i modded a 12v power supply to get them to work, pretty easy really.
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post #249 of 416
1/23/06 at 12:25am
Thread Starter 
Quote:
Originally Posted by CelticGibson
These fans i'm using are giving me almost 10c drop in temps when running 3d mark06 in 1440x900 resolution. I ran the demo without the fans and i got 92c constant. With the fans i get 80-82c. That's with an oc of 440c1200m with stock Dell heat pad. That is pretty good yes?
Hey! Very nice . Did you come up with a solution for mounting them more securely? Airflow is a definite problem with this laptop, but seems like you've done a good job solving it, that temp drop is great .

Quote:
Originally Posted by Doc.Caliban
As I said, airflow is a problem. Those heatsinks will do nothing unless air is passed over them. The best way to cool the RAM is still with the stock heatsink. The only way to get it better would be to cut the heatsink so that it was open to airflow, but that might ruin the integrity of the connection to the core.
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post #250 of 416
1/23/06 at 12:30am
Not as yet, but i was thinking of mounting them on a laptop cooling pad and have the laptop "sit in the cradle" so to speak. Using a metal ruler or length of metal running the base of the cooler and using epoxy resin to hold them in place. It's an idea for the moment. So far they sit lying against the vents, they are a little loud and i use a wireless numpad and mouse for games so the laptop never moves.
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post #251 of 416
1/23/06 at 12:43am
I don't think those fans will work on an XPS2. The side vents don't do much other than let you have lights in there. The fan intake is on the bottom, and the output is in the back. Do the sides actually work as intakes on the 9300?

I guess they'd force some air into the XPS chassis, but not directly into the intake for the system fans.

-Doc
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post #252 of 416
1/23/06 at 12:48am
When i opened the 9300, i noticed the fans are beside the vents. They must be taking in air thru the vents as well as the top and bottom. These are the only things blocking the internals. By having these fans blow cold air in the vents (and thru the inside of the chassis) the internal fans have much colder air in which to pass on to the heat grills. Note that these fans are quite powerful.
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post #253 of 416
1/23/06 at 12:51am
I'd be loathe to cut the actual thermal assembly itself. Sure, you have the backup of the 6800U assembly (if you had an XPS2 to begin with - you're screwed if you had the 6800NU), but for all we know, the assembly was designed as a heat broker, and cutting a large chunk out of it could actually RAISE temperatures since there'd be less area for the heat to diffuse.
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post #254 of 416
1/23/06 at 12:58am
Just a side note- I have a BFG 7800gtx and the ram chips on that card get really hot - I was surprised how hot the ram got - theres a plate over the ram and it will almost burn your finger under load.
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post #255 of 416
1/23/06 at 1:04am
I'm not surprised considering how hot the main ram (533mhz) gets underneath at load too!
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post #256 of 416
1/23/06 at 1:06am
I believe SODIMMs are designed to take a far heavier thermal load in exchange for more conservative timings.
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post #257 of 416
1/23/06 at 2:19am
Thread Starter 
Quote:
Originally Posted by CelticGibson
they are a little loud
Aren't they three speed? What speed are you running them on?


If you look at that photo, you'll see that the fan housings are completely isolated from the side vents. It seems that those vents are there purely for ventalation of the chassis. Some airflow going through there would push its way into the chassis. If you ran your laptop with its keyboard off, I'll bet you'll see temps drop even more. Another thing you could try is a push/pull configuration with air being blown in on the CPU side and sucked out on the GPU side. Try different thigns and see what gives you the lowest temps .

Quote:
Originally Posted by destruya
I'd be loathe to cut the actual thermal assembly itself. Sure, you have the backup of the 6800U assembly (if you had an XPS2 to begin with - you're screwed if you had the 6800NU), but for all we know, the assembly was designed as a heat broker, and cutting a large chunk out of it could actually RAISE temperatures since there'd be less area for the heat to diffuse.
All very possible circumstances, and that's why I never cut mine up.

And yes, it's surprising to many how hot the DDR3 runs, but it does run toasty. That's why so many mobile graphics cards use DDR1 still, because it uses less power and runs much cooler .
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post #258 of 416
1/23/06 at 2:26am
they are 3 speed but i just left them on high just to be sure they gave maximum cooling. I noticed from the photo that the air blowing in maybe passes underneath the 7800 thus helping to cool it down? My idea was to fill the area around the internal fans with colder air than they would normally get otherwise thus helping in their effectiveness overall. With the fans on, i get 27c idle on CPU and 43c idle on GPU. Either way, something is happening to affect those temps!
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post #259 of 416
1/23/06 at 2:28am
BTW they are not any louder than my wife's Toshiba A75! Now that sucker is LOUD!!!
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post #260 of 416
1/23/06 at 2:42am
Quote:
Originally Posted by Mr. K6
That's why so many mobile graphics cards use DDR1 still, because it uses less power and runs much cooler .
Can you elaborate on this a bit? Everything I read about GDDR3 when it first started being used on graphics cards in the past few years was that it ran cooler and used less energy than GDDR1. Some cards even were released with no heatsink attached to the GDDR3 modules at all, as the cooling wasn't necessary, despite the higher clockspeeds. Here's a quote from an article on the 6800 Ultra when it was released:
Quote:
The 6800 Ultra is equipped with the latest available in affordable yet really fast GDD3 memory; on the 6800 Ultra it is running at 1.2 GHz (2x600 MHz). BTW GDDR3 is designed in a way that its temperature is much cooler. It's likely we are going to see 6800 cards without ramsinks.
And here, where it says:
Quote:
The new cooler on the X800Pro and XT is actually a tad smaller; it doesn’t need to cool the GDDR3 memory chips.
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