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AMD Radeon 6990 Club - Page 259

post #2581 of 4103
Quote:
Originally Posted by ezveedub View Post
Check the timings, because I know some boards used 1T instead of 2T when setting XMP, which will cause issues most of the time. Manually set the voltage to the required setting or slightly higher. You have to check the memory multiplier is correct with Uncore clock also. Some times it gets thrown off when you set your OC settings, but if you set the BCLK too high, you also have to watch and adjust the QPI also. This calculator helps with some of those numbers.

http://icrontic.com/files/apps/nehalem-calc/
Thanks. I'll get right on it on Thursday when I finally get my 6990.
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post #2582 of 4103
Quote:
Originally Posted by Nexus6 View Post
Welcome to the club, Lune.
Thanks
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post #2583 of 4103
Greetings oh so revered 6990ers!

I have a dual 6990 rig planned which I plan to water cool.

However I do have some cooling/power questions. I've tried to skim through
this massive thread for an answer and checked various systems for concrete answers
but alas my eyelids fail me so Il jump on the question wagon.

I gave ordered an Obsidian 800D and get a 3x120 Rad on the top with push/pull and now looking for more ways to
squeeze in more Radiator space to be able to cool CPU and two 6990s.

I've already ordered most of the parts and got a Koolance RP-1000BK as a pump/reservoir, as well as a 3x120 rad, a CPU 370 and two ARR699s
What I am thinking could complete it for cooling is one 2x140 Rad and a single 140Rad. One for the front bottom with modding and one for the back fan space.
And get another RP-1000BK for symmetry for a second loop.

So the rig would be to have one loop with the CPU (2600k) and the 2x140 Rad with a RP-1000BK

And the other loop with the two 6990s with a 3x120 Rad and a 140 Rad with a second RP-1000BK.

Would it be adequite cooling and would the second pump handle two rads and video card blocks? I am aiming for ~5Ghz for CPU and upper 900 for GPUs

Also a side question, I've noticed alot of people using the Corsair AX 1200. Is it enough to power a rig with two 6990s?

Would be very grateful for advice, help or suggestions. But please consider I have ordered some stuff (most of it) and can't completly change the rig.

//Urkling
post #2584 of 4103
Quote:
Originally Posted by Urkling View Post
Greetings oh so revered 6990ers!

I have a dual 6990 rig planned which I plan to water cool.

However I do have some cooling/power questions. I've tried to skim through
this massive thread for an answer and checked various systems for concrete answers
but alas my eyelids fail me so Il jump on the question wagon.

I gave ordered an Obsidian 800D and get a 3x120 Rad on the top with push/pull and now looking for more ways to
squeeze in more Radiator space to be able to cool CPU and two 6990s.

I've already ordered most of the parts and got a Koolance RP-1000BK as a pump/reservoir, as well as a 3x120 rad, a CPU 370 and two ARR699s
What I am thinking could complete it for cooling is one 2x140 Rad and a single 140Rad. One for the front bottom with modding and one for the back fan space.
And get another RP-1000BK for symmetry for a second loop.

So the rig would be to have one loop with the CPU (2600k) and the 2x140 Rad with a RP-1000BK

And the other loop with the two 6990s with a 3x120 Rad and a 140 Rad with a second RP-1000BK.

Would it be adequite cooling and would the second pump handle two rads and video card blocks? I am aiming for ~5Ghz for CPU and upper 900 for GPUs

Also a side question, I've noticed alot of people using the Corsair AX 1200. Is it enough to power a rig with two 6990s?

Would be very grateful for advice, help or suggestions. But please consider I have ordered some stuff (most of it) and can't completly change the rig.

//Urkling
That Koolance pump setup has a good pump, but seems a bit out from what most use here, since the pump itself can be had for a lot less. Actually two pumps could be used with a top and reservoir for less, but with no other controller options of course. The AX-1200 PSU works also. On the 6990 waterblocks, I would connect them in parallel, not serial. You don't want to add heated coolant from one card to the next. As for the case, I can't comment on what setup to use, since I don't have one. I personally went with two RX360 rads in a Case Labs M8 case instead and it cools my CPU and both 6990s just fine. I'll be adding my motherboard water blocks to my loop soon also, but everything works fine for me in one single loop.
     
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post #2585 of 4103
A360mm rad, aka 3x120 is a waste of space in a 800D. Slap a 480mm in there! And, imo I'd put a 240mm in the bottom of the case as well.
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post #2586 of 4103
Thread Starter 
Quote:
Originally Posted by Urkling View Post
Also a side question, I've noticed alot of people using the Corsair AX 1200. Is it enough to power a rig with two 6990s?
Yes, the AX1200 will power 2X6990 without any problems, since my AX1200 is powering all this: 6990+6970+6970 (Quad-Fire), i7 2600K at 5.1 24/7, 16Gb of RAM, 3 pumps MCP655, 3 SSD, 3 2TB HDD, 1 Blu-ray writer, and 19 fans Gentle Typhoon AP-15 120mm.

I can run LinX AVX + Furmark and the AX1200 is yawning at me.
    
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post #2587 of 4103
Quote:
Originally Posted by Urkling View Post
Greetings oh so revered 6990ers!

I have a dual 6990 rig planned which I plan to water cool.

However I do have some cooling/power questions. I've tried to skim through
this massive thread for an answer and checked various systems for concrete answers
but alas my eyelids fail me so Il jump on the question wagon.

I gave ordered an Obsidian 800D and get a 3x120 Rad on the top with push/pull and now looking for more ways to
squeeze in more Radiator space to be able to cool CPU and two 6990s.

I've already ordered most of the parts and got a Koolance RP-1000BK as a pump/reservoir, as well as a 3x120 rad, a CPU 370 and two ARR699s
What I am thinking could complete it for cooling is one 2x140 Rad and a single 140Rad. One for the front bottom with modding and one for the back fan space.
And get another RP-1000BK for symmetry for a second loop.

So the rig would be to have one loop with the CPU (2600k) and the 2x140 Rad with a RP-1000BK

And the other loop with the two 6990s with a 3x120 Rad and a 140 Rad with a second RP-1000BK.

Would it be adequite cooling and would the second pump handle two rads and video card blocks? I am aiming for ~5Ghz for CPU and upper 900 for GPUs

Also a side question, I've noticed alot of people using the Corsair AX 1200. Is it enough to power a rig with two 6990s?

Would be very grateful for advice, help or suggestions. But please consider I have ordered some stuff (most of it) and can't completly change the rig.

//Urkling
Since you plan to put one radiator outside back of the PC casing, better get a bigger rad. Will give more headroom temperature wise.

I also use CPU-370 + EK UD9 on one loop 4 x 120mm. The other loop for 2 VID-AR699s 3 x 120mm + 4 x 120mm. All radiators fitted with QDCs to easily take out or add in more radiators or pumps when it is needed.

Note:

Either you plan to run the VID-AR699s in serial or parallel, get 2 types of Koolance SLI connector i.e., adjustable 1 slot and 2 slot or 3 slot depending upon the motherboard PCIe spacing. I made the mistake once, measuring the distance between the PCIe slots without taking the thickness of the VID-AR699 into consideration.

I run it in parallel not due to the heat from the top card but to reduce the pressure from the pumps, though all with compression fittings. Didn't do it scientifically by calculating the head etc so wouldn't know which parts will most probably fail. Just put in what I have spares in stock.

Edit:

Just checked, I am also using the same RP-1000BK to run the 360mm + 480mm. It gets the job done nicely most of the times running at 50% of its rated on Auto. But went a little overboard with all fans using Scythe Gentle Typhoon 120mm 5,400 RPM. Have to slow it down to 1,800 - 3,000 RPM. At full speed it is comparable to 6990 stock cooler at 100%.
Edited by Ken1649 - 7/6/11 at 4:16am
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post #2588 of 4103
Quote:
Originally Posted by Urkling View Post
Greetings oh so revered 6990ers!

I have a dual 6990 rig planned which I plan to water cool.

However I do have some cooling/power questions. I've tried to skim through
this massive thread for an answer and checked various systems for concrete answers
but alas my eyelids fail me so Il jump on the question wagon.

I gave ordered an Obsidian 800D and get a 3x120 Rad on the top with push/pull and now looking for more ways to
squeeze in more Radiator space to be able to cool CPU and two 6990s.

I've already ordered most of the parts and got a Koolance RP-1000BK as a pump/reservoir, as well as a 3x120 rad, a CPU 370 and two ARR699s
What I am thinking could complete it for cooling is one 2x140 Rad and a single 140Rad. One for the front bottom with modding and one for the back fan space.
And get another RP-1000BK for symmetry for a second loop.

So the rig would be to have one loop with the CPU (2600k) and the 2x140 Rad with a RP-1000BK

And the other loop with the two 6990s with a 3x120 Rad and a 140 Rad with a second RP-1000BK.

Would it be adequite cooling and would the second pump handle two rads and video card blocks? I am aiming for ~5Ghz for CPU and upper 900 for GPUs

Also a side question, I've noticed alot of people using the Corsair AX 1200. Is it enough to power a rig with two 6990s?

Would be very grateful for advice, help or suggestions. But please consider I have ordered some stuff (most of it) and can't completly change the rig.

//Urkling
Depending on where you live, it's summer time & you would be suited well to implement another radiator. I'm running a "480" & 2 "360" radiators at the moment. MCP-35X pump with a MPC-655 on the pump side. Everything is run in a serial loop; I prefer & believe them superior, as it ensures no wasted "radiator" potential.

Presume a "480" radiator maintains X amount of heat-dissipation capacity per "loop". For ease of use, let's say X=650 watts of removal. If you run a 6990 & a Sandy Bridge through the radiator @ 575 (arbitrary figure chosen) watts, then we have an effective sub-optimal performance from that radiator. There's no reason to run parallel, as the "extra" heat doesn't influence the successive GPU by more than a degree or two. It's quite well-documented, in fact, & I see it in practice every day; my primary GPUs on 6990 #1 idle at 43, 40 during the day (very, very high ambient) whilst #3 & #4 idle at 37, 39. Granted, thermal paste application can influence this figure, but I'm adept at building machines of this nature & can assure you the margin of error from such doesn't account for much.

However, if there is not enough radiator to clear out the excessive heat, it will be very problematic to have a straight serial loop. Radiators work to balance out & create an equilibrium of water temperature that nearest matches that of ambient. Maintaining multiple radiators succeeds in keeping the equilibrium of the entire loop down, regardless of successive high-wattage components being in direct association. I wouldn't take this to an extreme, though (say, CPU - GPU - GPU - RAD) as there'd be little room left for radiat or positioning anyway. But, and this is what I have, RES - PUMP -CPU - RAD - GPU - GPU - RAD - PUMP 2 - RAD, provides all the strategic thermal dissipation necessary for a very successful serial loop.
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post #2589 of 4103
Thread Starter 
Parallel vs serial is more of a watercooling ''myth'' then anything else. After 20-30 minutes, the waterloop will reach a state of equilibrium, and your water temp will be the same all across your loop. So it doesn't really matter. In the first 20-30 minutes, yes, it can make a difference. But if you are gaming for hours, it won't.

So do what's easier for you. I do serial because it's easier for tubing in my case. So do what's easiest for you.

GPUs are not like CPU. When overclocking a CPU to the limit, each 0.5 celsius is vital, but with a GPU, you can have a delta of 20 celsius without any problems. GPU can tolerate much more heat without any problems.

Also, you have to consider that while rad surface is important, your ambiant temp, and your fans speed, is also really important for the performance of your loop.

For example, 3 fans turning at 1000 rpm on a triple 120 rad will not cool like the same 3 fans turning at 3000 rpm.

For a silent PC, you must have more rad surface with slow turning fans. I have 19 fans turning at 800 rpm. Whisper quiet... But probably that 9-10 fans turning at 2200-2500 rpm would give me the same results... but with headaches (for me...), since I don't like gaming with headphones. But for some people, a delta fan turning at 3000 rpm is ok because they game with headphones.

So it's a choice you have to make.

But for 2X 6990, 1 triple-120 rad with Gentle Typhoon at 1800 rpm would probably be enough.
    
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post #2590 of 4103
Thanks all for the replies, very helpful.
Got my pump/power issues solved!

The big issue is getting enough rad space to handle the needed heat dissapation without it being a worry. I would get nervous even in swedish summers.

Ideally Id like it to be mounted on/in the case for easier transportation if the time would come.

But it seems that except for the 360 Rad that fits on/under the top grill it's not possible to get additional without quite some modding. I've looked up the bottom front 240 rad mod and I am quite confident I can manage that. But havn't found any "guides" so to speak for a 480 on the top (which would be awesome to have) I am not too experienced with case modding to be sure of a nice result.

Is it possible to get two 360s on the top? One above and one under the grill and then somehow mount fans for a pull/push config through them both? Or would they simply help heating eachother?

Or is there some big fat 1080 that can reasonable easy be mounted on side of the 800D in a reasonably sturdy fashion?

Edit: And sound is not too much of a problem, although preferably bit less than the 6990 onboard fans :-p I plan on using gentle typhons anywhere it's possible to create/aid with airflow.
Edited by Urkling - 7/6/11 at 5:37am
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