Sign in with
Sign up | Sign in
Your question

Single or Dual loop for Quad sli?

Last response: in Overclocking
July 24, 2011 7:30:04 PM

ok new thread,
Managed to get hold off a 2nd GTX 590 (gift) so was thinking about running current rig in SLI.

I was wondering if I could add a 2nd GTX 590 to this single loop without having much of an increase in my temps?

here is my current spec and pics

Intel 17 980x OC to 4.2
EK-Supreme HF - Full Nickel
Asus Rampage III Extreme
Corsair 1000 w PSU (I think I need to upgrade to 1200w)
OCZ RevoDrive X2 PCI-Express Internal SSD
4 x 7200 rpm 1TB HD No Raid (just used for storage, pics, movies, games, work back up-editing stuff, docs for the family etc)
1 x Blue Ray
1 x CD/RW
4 x Cathode
1 x 5 Channell Fan controller
3 x Dell u2410 (surrond vision)
1 x EK Coolstream 360 Radiator
1 x XSPC RX 360 Radiator
Tygon R3603 7/16" ID - 5/8" OD (11-16mm) Tubing
XSPC Acrylic Dual 5.25" Reservoir for Laing D5
Swiftech Laing D5 Vario MCP655 12V DC Pump
EVGA 590 GTX Hydro Copper x 2

Would be great if I could get away with single loop and still get moderatley cool temps?
Also checked PSU spec the calculator says minimum should be 986W and recommended is 1018 but again hoping I could get by with 1000w or would it be wiser to go with a 1200W?

For the time being only the CPU is overclocked to 4.2

thanks for previous help, any suggestions or advice would be most welcome


" alt="" class="imgLz frmImg " />" alt="" class="imgLz frmImg " />
a c 328 K Overclocking
July 25, 2011 2:23:44 PM

1 x XSPC RX 360 Radiator

As great as this rad is, you will need more with a i7 980 and 2x SLI 590's. (especially when you are wanting OC on the CPU.)
July 25, 2011 4:25:49 PM

running 2 RADs
1 x EK Coolstream 360 Radiator
1 x XSPC RX 360 Radiator

was advised to run a 1 x 480 for the Cards and use the 360 for CPU but on dual loop
1 x 480 and 1 x 360 on single loop (still delibarating) not sure which would give best temps without to many components
Related resources
a c 328 K Overclocking
July 25, 2011 4:37:08 PM fault on missing the EK.

You'll want to run a single loop if you are going to run those rads...might as well give all your components the benefit of using all your radiators to keep them cool. If you want to run 2 real benefit. There are many good arguments that show if you run 2 loops vs. a single loop using the same components, the single, serial loop will out-perform a dual loop simply because every rad is cooling every take advantage of all your cooling in the same loop and not letting some go to waste by 'over-radding' one loop and making par on the other.
July 25, 2011 5:21:07 PM

no probs - thanks for reply
I agree with your point; makes sense also read your other posts on the forums
just contemplating on if I will really see much difference if I went for a 1 x 480 and a 1 x 360 or if I should stick with the 2 x 360's I have
a b K Overclocking
July 25, 2011 5:31:37 PM

I would just stick with the 2x360's... I dont think that another 120mm of radiator will really do a whole lot, for the cost at least.
a c 328 K Overclocking
July 25, 2011 5:34:43 PM

Agree with Orange on this. You might see some improvement...likely minimal...if so.
July 25, 2011 5:40:26 PM

great you guys have help me save money, again! :-)

I was starting to add up the cost plus I realised might need a 1200 w PSU as I might be pusing it with my 1000w
a c 328 K Overclocking
July 25, 2011 7:51:15 PM

CPU clocked to that, as well as running SLI 590's- you still might consider it. If you are getting a load ~1000w (you are saying a little higher) you are going to be stressing a 1000w PSU to 100%+ of it's load. Now, those aren't exact numbers, but without checking myself, that seems a little high. I would have assumed around 850w @ load with those components...can you post what you had found?
July 25, 2011 9:45:03 PM

No probs, here is what I entered and the results from (

System Type: Single Processor
Motherboard: Regular - Desktop
CPU: Intel Core i7-980X 3333 MHz Gulftown
Overclock: 4212 MHz, 1.3 V
CPU Utilization (TDP): 85% TDP
RAM: 3 Sticks DDR3 SDRAM
Video Card: NVIDIA GeForce GTX 590
Video Type: SLI
IDE HDD 7200 rpm: 4 HDDs
DVD/CDRW Combo Drive: 1 Drive
Blu-Ray Internal Drive: 1 Drive
Sound Blaster - All Models: Yes
Additional PCI Card (avg): 1 Card
PCI-e x4: 1 Card
Fan Controller: Yes
Front Bay LCD Display: Yes
Regular: 1 Fan 92mm;
High Perf.: 7 Fans 120mm; 2 Fans 140mm;
Water Pumps: Swiftech MCP 655
Keyboard & Mouse (included): Yes
System Load: 90 %

Recommended PSU Wattage: 1099 Watts
a c 328 K Overclocking
July 25, 2011 10:07:14 PM

That's pretty crazy...makes me glad I got my BFG 1200w...I can keep using it for the foreseeable future.
July 25, 2011 10:37:51 PM

:-( I know its the one thing I forgot to plan for, well tbh never thought I would consider SLI, flip side is I can still sell the 1000w to make up the difference, just a pain having to re cable.

thanks again, im all set will post the temps & pics when its all done a bit later
a c 328 K Overclocking
July 26, 2011 1:32:59 PM

I think that would be a decent idea...esp if the watt calc is showing you putting out 1000w+.

Damn...that's a lot of power draw.
July 26, 2011 2:46:48 PM

I know I was wondering why we kept getting black outs! Keeping the Energy bill hidden from the Mrs :-)

I think its a little exaggerated as I dont belive the fans are actually high performance ones - they are Scythe Gentle Typhoons not the Deltas and at 1850 rpm (6 in total), the HDDs are hardly used, and I have just 1 Asus Xonar sound card and no front bay LED so should be just below 900 or so

but to be on the safe side a 1100 PSU or more would be wise so ill go for the 1250 OCZ cheaper than the Corsair 1200W

just ordered a OCZ ZX Series 1250W '80 Plus Gold' Modular Power Supply