View Full Version : Watercooling the 6800GT and passive ramsinks?

05-28-05, 02:28 AM
Short question. Will it be alright to put passive ramsinks on a 6800GT while watercooling the gpu? I'm doing this in a Shuttle case, btw. I can get the entire watercooling kit cheap, but it only cools the cpu and the gpu, not the video card ram. I read somewhere that GDDR3 runs cooler than DDR. Anyone with expierence in this? I don't plan on overclocking.

05-28-05, 03:00 AM
Don't. I did with my old GT for a while and gave it up. The GDDR3 doesn't stay cool AT ALL! If you don't have and extremely good airflow in your case (wich i doubt since you use water) the ramsinks will get extremely hot. My Copper BGA sinks got so hot you could burn your fingers on them. That's not even the problem though.
The Sink on the power converters gets even hotter wich is the reason for so many dead cards btw.

I am cooling my card with this one now:

I wouldn't suggest the dangerden one either since it misses the power converter cooling wich is vital IMO.
If you go for a GPU only cooling solution then i advice you to place a 80mm Fan @ 5v in a way it blows over converters and memory.

05-28-05, 10:21 AM
Well, actually GDDR3 ram runs really cool compared to other memory. But if have no airflow, I would not recommend it.

05-28-05, 12:15 PM
Here's the trouble. This is the kit I'm looking to get. http://www.kingwin.com/pdut_detail.asp?CateID=31&ID=187
Nothing fancy, but enough to keep everything cool. The hose is only 1/3" diameter. If I'm going to cool the vid card, I'd need something that fits the hose. Any suggestions?

05-28-05, 12:37 PM
That kit is worse than a half decent HSF from what I hear. If you want to go water with a kit, you should get the Corsair or Swiftech kits. Adding to those is pretty easy too.

05-28-05, 12:44 PM
That kit is worse than a half decent HSF from what I hear. If you want to go water with a kit, you should get the Corsair or Swiftech kits. Adding to those is pretty easy too.

Yes but the Kingwin kit cools both the cpu AND gpu for half the price. It has to be better than the stock heatpipe I'm using now. I don't need superubahhAx0r cooling. Just something better than what I have now.

EDIT: I should mention that with the stock heatpipe, my cpu runs at 47 idle and 52 load. That's an A64 3200+ stock speed. Fan speed set to medium. Artic Silver 5.

05-29-05, 11:26 AM
I don't think passive cooling is too good either... My watercooled 6800Ultra had a temp about 50-70 degrees celcius, and i got much artifacts and a generally unstable card. I'm pretty sure the GPU should be able to get hotter than 70 degrees before such happens, so i guess the RAM was the problem. They were very hot when touching the heatpipe.

05-29-05, 11:28 AM
Consider the coolermaster aquagate... its not half bad :)

05-29-05, 11:32 AM
I have a watercooling system myself, and here is what I recommend.

Get an EXOS Al, they are a lot cheaper now that the EXOS 2 has came out, but the EXOS Al still provides excellent watercooling.

Then get the following waterblock for your GPU

or if you want it to work with SLI or PCIe get this one

with one of these setups, you could probably get your GT to around 450MHZ and 1200 memory.

05-29-05, 11:57 AM
I have a Danger Den NV-68, Works great. :D


05-30-05, 03:47 AM
Those Koolance blocks for 6800 series are at a tempting price/performance point.

Koolance systems are underestimated and wrongly scorned by many watercooling people simply becuase of the 1/4" tubing. Mine is a solid and worthy contender; even with a Barton 3000+, nForce Ultra 4000, and FX 5800 in the water loop, temps stay low (26C SPP, 33C CPU, 44C GPU). Koolance OCs my 5800 to Ultra speeds, a 25% overclock. Even compared to my 3/8" tubing Inovatek system, Koolance holds its own.