Swiftech MCW50-T Video Water Block?

[Section8]

Anyone here use this water block for there GPU? I was wondering a few things. Will it work on a 6800? They sell a addapter kit to make the non-T version fit so maybe the kit will work for both? How much power does the TEC draw? How prone it the unit to causing condensation? What steps did you take to make sure you didn't get condensation? Thanks.

http://www.frozencpu.com/images/products/detail_secondary/ex-blc-12_2.jpg

http://www.frozencpu.com/images/products/detail/ex-blc-12.jpg

[Dissolved]

Those are usualy an 80watt tec. youd probly need to geta 172watt tech as the 6800 is around 85watts load or so..

im not 100% sure on the mounting tho.

either way thats a great block for the older gen cards..

[Section8]

Hmmmm only an 80 watt..huh...I also heard some things with the 6800's having problems with sub zero temps due to a throttling issue. Anyone herad anything about that?

[sandman001]

If you run it off your PC PSU it's only gonna be about a 60watter.

You need a 172watter. With a Power supply capable of 15+ volts.

[Dissolved]

Hmmmm only an 80 watt..huh...I also heard some things with the 6800's having problems with sub zero temps due to a throttling issue. Anyone herad anything about that?


yea, i read about that.. i believe theres a fix, or a way around it.. i think the the 5800 series had that issue. do a search..

and yea, you will have to get a seperate PSU to run a 172watt tech. look for a meanwell 15v~24v. you Could run it on a 12v but youd only get around 135watts or so as i believe the 172watt techs are rated on 24v 8-12amps.

[sandman001]

actually, it'd be half of 172watts, so about 86 watts of cooling power at 12V.

[Section8]

What would you guys recommend to cool my 6800 Ultra right now? I will probably just have the GPU in the loop because the CPU is handled by the VapoChill and the Northbridge doesn't even get remotely warm. The Northbridge runs very cool. I think it has to do with the memory controller being on the chip and therefore the Northbridge doesn't have to deal with it. Anyways I was thinking the D4 pump, 3/8 Tygon tubing, Double heater core and a GPU block yet to be determined. I have heard good and bad things about the DD 6800 WB and am not sure what to do? I know the Swiftech MCW50 will fit with an adapter plate from Swiftech and the Polarflo will also fit with different screws. Any suggestions? Also do you think the Double Rad will be overkill?

[Aphex_Tom_9]

actually, it'd be half of 172watts, so about 86 watts of cooling power at 12V.
wouldnt the pelt just draw more amps off the 12v line to compensate for the lack of full voltage? they are flexible in that respect. the PSU would have to be rated for a lot of amps on the 12v line though.

[sandman001]

No, it won't. Actually as voltage drops so does the amps it draws. For example, a 226watter draws 25AMps at 15Volts. At 12V, it's more like 24 or 23 amps.

[Section8]

Well I found a guy over at xtremesystems.org that is running the MCW50-T on his 6800. He says it bolted right on with the Swiftech 6800 adapter kit. He said he did have to get longer screws though. He claims his idle temps are about 15C and full load is about 30C. So I broke down and ordered the MCW50-T, DD D4 pump, DD Heatercore, 120mm Delta and some tygon tubing. I will get it in a few days and hope to have it up and running this weekend. I will post my results.

[LabRat23]

Ok, here is the physics and the math. The actaul ratio of performance at 12v vs. 15v is about 2/3. The resistance of the pelt is constant for a given temp. Therefore ohms laws apply. V=IR and W = IV therefore W=V*V/R, The power drop and therefore the heat transfer drop is the square of the reduction in voltage. 12/15 = .8 and .8*.8 = .64 ~=~ 2/3 So Qmax = 170 * 2/3 = 110w

For the graphics card producing 80w with the pelt producing 144w of heat a decent waterblock (.12C/W) will give you a 27C above ambient hot side temp. With a DTmax of 68C your pelt will give you a DT of 19C wich will put the cold side at 8c above ambient and the GPU itself at about 10C above ambient.

Now here is the kicker. If you are radical enough to get a pelt, you are certainly radical enough to try a cpu waterblock on your GPU. At 80w the waterblock (.14C/W) will drop your GPU to 11C above ambient.

Either get a bigger pelt or don't bother.

[Section8]

Ok, here is the physics and the math. The actaul ratio of performance at 12v vs. 15v is about 2/3. The resistance of the pelt is constant for a given temp. Therefore ohms laws apply. V=IR and W = IV therefore W=V*V/R, The power drop and therefore the heat transfer drop is the square of the reduction in voltage. 12/15 = .8 and .8*.8 = .64 ~=~ 2/3 So Qmax = 170 * 2/3 = 110w

For the graphics card producing 80w with the pelt producing 144w of heat a decent waterblock (.12C/W) will give you a 27C above ambient hot side temp. With a DTmax of 68C your pelt will give you a DT of 19C wich will put the cold side at 8c above ambient and the GPU itself at about 10C above ambient.

Now here is the kicker. If you are radical enough to get a pelt, you are certainly radical enough to try a cpu waterblock on your GPU. At 80w the waterblock (.14C/W) will drop your GPU to 11C above ambient.

Either get a bigger pelt or don't bother.

So we will see I guess cuz I already ordered it. I know someone that is using the 80watt pelt and waterblock combo and he reports 15C idle and 30C load so we will see I guess. I don't want to freeze it anyways as the 6800's will not work frozen. They have a throttling issue when frozen.

[LabRat23]

Interesting. I would love to know the true power draw of the gpu on these cards.

On thing I know: if you put a 80w pelt on a 80w chip, that chip will fry.

[Section8]

Interesting. I would love to know the true power draw of the gpu on these cards.

On thing I know: if you put a 80w pelt on a 80w chip, that chip will fry.


Yeah I was worried about that. I was thinking I should pull the water block apart and put a 172 watt pelt on there just to be safe. The guy at xtremesystems.org is just using the 80 watt pelt that came with the Swiftech WB and claims he is having great results. I am still worried though. Maybe before I install the 80 watt pelt/WB setup I should lower the GPU thermal warning to about 80C. I think it is set to 115C by default. I will keep you posted as everything is scheduled to be delivered today.

[fafnir]

section8, i can fix the low temp thermal throttling problem

it can't yet be defeated, but we do have ways of bypassing it, (the 25 celcius low temp throttle) with just a few registry mods

shoot me a pm and we'll talk


_

[WA2]

I use to use one of these on my 9800PRo. Ran at 511/389 very well. Scored 6888 in 3DMark03 with it. NOt bad for a 9800Pro. I have since moved on. I have been wondering if one would fint my X800XT/PE.

[Section8]

section8, i can fix the low temp thermal throttling problem

it can't yet be defeated, but we do have ways of bypassing it, (the 25 celcius low temp throttle) with just a few registry mods

shoot me a pm and we'll talk


_

How to you fix or bypass this using the BIOS? I tried the RIVA TUNER work around but it didn't help. I have a BIOS editor for my card and NVflash so I am all ready to do some BIOS editing but I need to know what to change. I would think that if I just changed the voltage of the throttling to the same as the 3D that it would fix it. Right now the 3D is set to 1.4 and the throttling is set to 1.3. So I was going to change them both to 1.5<---max it will allow. I think that would solve the problem. It won't let me set the Throttling Core and memory speeds so I see no other way. By the way my temps are 10C-14C idle and 28C-30C load.

[esoteradactyl]

section8, i can fix the low temp thermal throttling problem

it can't yet be defeated, but we do have ways of bypassing it, (the 25 celcius low temp throttle) with just a few registry mods

shoot me a pm and we'll talk


_

elaborate on this a bit more. ive been looking for a way to get around this stupid throttling :mad:

[Section8]

elaborate on this a bit more. ive been looking for a way to get around this stupid throttling :mad:

OK I finally got around it with the newest version of RIVATUNER. Here is what to do. First DL the latest version of RIVATUNER then do this.

http://homepage.ntlworld.com/susan.poole2/PerfLevelForce1.gif

http://homepage.ntlworld.com/susan.poole2/PerfLevelForce2.gif


Now I did't do what is in the second picture I just did what is in the first picture and the throttling is gone. My idle temps are 15C and using the RivaTuner hardware monitor my clocks are still at 502/1300 even though I am under 25C. I also modded my BIOS to 1.5 volts for 3D, 2D and throttle. I changed the default clocks to 475/1200 for now. 500/1300 seems to be the sweet spot right now until I hard mod the card to 1.77volts.

[DamienKC]

So all you need to use this is a watercooling setup and that peltier? Because I'd rather "extreme cool" my video card than my cpu personally. I might do this to my 6800GT (when I get it -.-), is condensation a worry?

And also, section8, your rig is insane, what kind of scores are you getting in 3dmarks?

[creepy]

I use one on my 9800p works great. Only problem was that it was drawing so much current after awhile I cooked one of the wires comming off the molex but no big deal took 5 minutes or so to fix. Gave good oc results. As for using it for the 6800 I have no clue. Ive been out of the whole "compute world" for the last couple of weeks or months at that so im a bit behind on stuff.

[Section8]

Condensation is not a problem as long as you use dielectric silicone and some neoprene on the back of the card. The Swiftech MCW50-T already has the neoprene on the front. I have only ran AquaMark 3 as of right now and my highest score with just OC'ing the video card not the CPU yet is 82,161