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i7-990x - How much better w/WC for temps?

post #1 of 19
Thread Starter 
In the past decade, I've always OC'ed my home-built rigs on air. This past weekend I built a new rig with an i7-990x, and though I really wanted to try out a full water cooling solution, since I've never done a WC build, I decided to baby step it and first use the new Antec Kuhler 620 closed loop solution.

So far, I'm pretty pleased with the results. I've got a stable (20 x LinX, etc.) 4.5Ghz @ ~1.36vCore with LinX burn temps around 77C, idle temps around 27C, with ambient room temp of ~24C.

During my various tests, I was able to easily get it up to 4.9Ghz at vCore 1.4 (couldn't test true stability due to resultant extreme high temps), so I know this chip has the ability to go much higher than 4.5Ghz.

While I do a lot of gaming, I also do a huge about of video/photography/audio work, and am interested in pushing to (but not beyond) the limits of this chip in terms of OC. I'm not looking for benchmarking speeds, but rather realistic 24/7 stable speeds.

That said, for those of you familiar with exceptionally good water cooling systems, how much more would you estimate that I can squeeze out of this setup for a stable 24/7 build with max LinX temps under 80-85'ish?

For context, here is the full system:
i7-990x
Rampage III Extreme (bios 1102)
12GB Dominator GT (currently running stable at 2005Mhz)
Antec Kuhler 620 (Antec rad fan replaced with 120mm Noctua, and additional 120mm Noctua added to other side of rad for fan-rad-fan config)
Corsair 800D
4.5Ghz (167x27) @ ~1.36vCore, DRAM 2005, uncore 3009'ish.


On a side note, I know this doesn't have anything to do with watercooling, but maybe someone will know anyway. What are the pros/cons to running 4.5 at 167x27 vs 205x22? While it runs stable with 167x27, when I try to switch to 205x22, LinX gives an incorrect result (bad error) after after the third run (33 minutes into the stress test). From what I've read, that means the QPI needs to be higher, but I've already got it at 1.4. I could run it stable at 196x23, but then the memory only runs at 1900'ish, instead of the full 2000 it's rated for. Thoughts the min/maxing of the numbers?


Thanks in advance!
Edited by geronimosan - 3/3/11 at 7:59pm
post #2 of 19
First off, what do you mean by 3.6vcore? do you mean 1.36vcore? Also temps should be pretty good, you have a great case for it, you can run a 360 up top and a 240 in the bottom of the 800d. Temps should be able to handle 1.4v on that chip.
post #3 of 19
Thread Starter 
Quote:
Originally Posted by the.FBI;12603485 
First off, what do you mean by 3.6vcore? do you mean 1.36vcore? Also temps should be pretty good, you have a great case for it, you can run a 360 up top and a 240 in the bottom of the 800d. Temps should be able to handle 1.4v on that chip.

Sorry, yes, 1.36. Fixed in initial post. Been on a plane all day, and just got to hotel - still a bit out of it.

Oh, so two rads, I hadn't even considered that. Still a lot to learn about WC'ing.

Does that mean you are thinking two loops, or do both rads work within a single loop?
post #4 of 19
Either would work, what graphics card do you have and are you interested in water cooling that? If you only want to cool the CPU a single loop with a single rad would be all that is necessary. If you have a graphics card that runs hot putting the CPU with a 240 rad loop and the GPU and mobo(mosfets and the like) together on a 360 rad you would most likely get very good temperatures depending on the radiators you picked. If you want to just get your feet wet you could look at the rasa prebuilt kit: http://www.frozencpu.com/products/12222/ex-wat-162/XSPC_Rasa_750_RS360_Universal_CPU_Triple_Radiator_Water_Cooling_Kit_Hot_Item.html it comes with everything you need to setup a basic water cooling loop, although your temperatures would be worse than if you put together a custom parts list.
post #5 of 19
Thread Starter 
Right now I just have an EVGA 480GTX, but in a week I'll have two 580GTX's SLI'ed, and plan to use the 480GTX for PhysX (need to research this as well).

As it stands right now, the case and all the Noctua fans is REALLY quiet, and when I game, the 480GTX overheats quickly, so with EVGA Precision I have to crank the fan up, and the noise is hellacious. So, for both heat and noise issues, I plan on WC'ing the 3 GPU cards. Also, I'm considering WC'ing the NB. Right now I'm using the optional heatsink w/fan provided with the R3E motherboard accessories, and it works decently, but if I'm going to jump into WC'ing, I might as well add that to the loop and cool it properly.

So, yeah, I guess with CPU, 3xGPUs, and the NB, definitely 2 rads, though unsure of the pros/cons of putting those things into one giant loop versus two smaller loops.
post #6 of 19
IMO the gtx 480 is useless with 2 gtx 580s, the cards will handle themselves easily and the 480 would simply take up space and add additional heat. So running a CPU and 2x/3x GPUs would benefit from 2 loops. I'm no expert but I think that running both the GPUs on a 360 rad up top and the CPU and Mobo on the bottom 240 rad would give you the best temperatures. You probably want to go a custom parts list since money doesn't seem to be an issue. I would suggest:
You would also need 1 or 2 reservoirs, I'm not really sure how that would work with 2 loops someone else would have to help out here. Tubing seems to be a price/preference thing with barbs being cheaper and compression fittings being the most expensive.

Edit: the SR1 radiators work best with mid range fans, if you want a silent rig I suggest finding some Gentle Typhoon 1850 rpm fans.
Edited by the.FBI - 3/3/11 at 8:34pm
post #7 of 19
Look to EK waterblocks they are best imo but pricey. How every you pay for quality. You have a great case. It can fit a ton of WC parts.

I would look at RASA for the rads 2 360's or if you want I think you can fit a 480 at the bottom and 360 up top.

For pumps a d-5/MCP655 or 355. Your loop will be considered restrictive with 3 gpu + cpu and NB hs you could even contemplate on going with 2 655s.

I would not suggest the RASA kit for your build you will want the EK HF Supreme cpu block.

GT AP-15's are great fans for the RASA Rads for reference I use them with my 360 RASA rad.

I would stick to one big loop its much more expensive to run 2 loops than one big one. If you go for 2 loops there is a XSPC dual bay that you can use.
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post #8 of 19
Thread Starter 
Thanks for the info guys. Okay, after a bit of reading, I've decided to forego the NB cooling for the time being and will play it by ear, and have decided on doing the SLI without the dedicated PhysX card.

So, now that I'm cooling only the CPU and 2xGTX580 GPUs, do you guys still recommend two rads in the loop, or only one?

I've seen people bounce between suggesting the swiftech 355 and the 655 pump - which would be better for my use?

And can someone explain to be what a pump top is?

For maximum flow and cooling, is the 7/16 tubing on 1/2 barbs what I should be using? Or is there a differently sized tubing/barb combination I should be using?

Many thanks!
post #9 of 19
Quote:
Originally Posted by geronimosan;12635141 
Thanks for the info guys. Okay, after a bit of reading, I've decided to forego the NB cooling for the time being and will play it by ear, and have decided on doing the SLI without the dedicated PhysX card.

I would agree here, will save you a lot of trouble in the long run.
Quote:
So, now that I'm cooling only the CPU and 2xGTX580 GPUs, do you guys still recommend two rads in the loop, or only one?

I would go with at least 2 radiators, the more radiator you have the better your results, though marginal. I would go with at least a 360 for the GPU's and probably a 240 for the CPU. I would also use them in the same loop. (1 loop) You'll see more gain that way than going with two individual loops.
Quote:
I've seen people bounce between suggesting the swiftech 355 and the 655 pump - which would be better for my use?

I would personally roll with a 355 since they have more pressure. Either will do though.
Quote:
And can someone explain to be what a pump top is?

You're simply replacing the top part of the pump, where the inlet and outlet are. This changes the flow going into the pump and out of if. For the 355, most tops are far better than the stock, for the 655, the aftermarket tops are marginal at best.
Quote:
For maximum flow and cooling, is the 7/16 tubing on 1/2 barbs what I should be using? Or is there a differently sized tubing/barb combination I should be using?

Many thanks!

Tube size makes a minimal difference on flow rate and cooling. 7/16 tubing over 1/2 barbs allows you to get an exceptionally tight fit for the tubes over the barbs, allowing you to circumvent the use of clamps over the barbs.
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X99
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post #10 of 19
Thread Starter 
Thanks for the input.

Okay, so my list right now is looking something like this (throwing it out for a sanity check):

CPU Block - EK-Supreme HF - Full Copper
Rads x 2 - 360 Black Ice SR1 (I believe I can fit 2 x 360's in the 800D case (top & bottom))
GPU block x 2 - EK gtx 580
Pump - swiftech 355


What's left to decid I believe is the pump top, fans that best fit the Black Ice rads, and tube fittings?

Care to weigh in on those as well?


Is there anything else I'm forgetting at this point?
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