At even a virtual 2cents, JayZ is grossly overcharging.
I have 6 temp sensors connected to a 6 channel digital readout. They measure to 0.1 C accuracy:
Top rad temp In / Top rad temp out
Bot rad temp In / Bot rad temp out
Ambient Air / Inside case Air
i don't get the goal of having low temps.... For Radiator design in high end PCs ... 10C is considered the "hi end goal. Heat transfer is proportional to"Delta T"... so if your goal is 1C, you need 10 times cooling capacity at 1C than 10C
Im playing an MMO right now , not at all demanding ... GPU load is 17%. Fans are not spinning (they shut off at low temps) , Temp Drop across the 420 x 45mm is 1.0 C; Temp; Temp Drop across the 280 x 60mm is 0.7 C. Ambient is 23.7 / Water temp is 30.1. So what would be the point of getting water temps at 1C above ambient ? Never thought to try it but Im sure that fans not spinning is quieter than fans spinning even if the noise doesn't exceed ambient and ya can't tell the difference.
The system Im typing from has a gross component heat load of about 700 watts. The rads will need to handle about 60% of that load; part of the other 40% is radiated thru rad shrouds, tubing heat sink exposed surfaces etc. with alarge part of it actually not present because you never hot peak loads on all components at the same time. When running 100% stress tests, the GPUs reach 39C with fans at set 1200rpm. Based upon the fan curve however, they top out at about 44C and < 800 rpm under Furmark .... 550 - 600 rpm when gaming at 41C
Addressing the problem is kinda like telling the doc you don't "feel good".....
1. What are fan rpms ?... we use 140mm fans w/ max rpm of 1200 rpm. if you replace the Noctua fans on a Noctua cooler with Phanteks low speed fans, temps drop 6C at the same RPM
140 mm fans from Noctua, Phanteks, and Xigmatek battle in our latest fan roundup with one emerging as a clear winner in both thermal performance and acoustics. May 21, 2013 by Lawrence Lee Last month we staged an epic shoot-out among some popular 120 mm fans. Some great sounding fans emerged but...
silentpcreview.com
"The Phanteks PH-F140HP/TS is the clear winner in every respect. It edged out the new Noctuas every step of the way, delivering the best overall results of any fan we’ve tested thus far. To top it off, it had cleanest, smoothest sound of all the new fans in this roundup. If we had to start from scratch, this might be our new reference model.
2. What pump and what speed ? ,,, in other words are you maintaining 1.0 - 1.25 gpm. On dual rad systems we use the Swiftech 35X2 dual pump with heat sink and fan. back in the day when twin x70s in SLI were 49% faster than the x80 at the same price, water coolers could gain a boon by putting the GPU water blocks in parallel.... GPUs, due to their huge block size, need far less flow so pushing say 1/2 gpm theu the CPU worked well with 0.60 gpm thru each GPU ... as the 39C results under Furmark showed.
https://martinsliquidlab.wordpress.com/tag/35x2/ ... highly recommend the optional heat sink and fan
3. Radiator fans ALWAYS blow in . no exceptions ... ever ... unless of course your goal is to reduce cooling efficiency
Don't fall for the "gotta get the air out" nonsense
a) whats left in side your PC that needs cooling besides GPU CPU and potentially MoBo VRMs
b) Every cu.ft. that is blown into your case exits you case... id guess with your set up you are blowing into your case, is exiting your case ... if not conservation of mass dictates your case exploded. Ever use a window fan to blow cool air in at nighy after a hot day. Works great don't ? ... well it does if you open a 2nd window to let the hot air out. You don't neeed a 2nd fan to blow air out do you . ? Every cuft of air that is blown in by that fan goes out that other window ... your case grilles are the other window.
c) If water temp is 38C, ambient is 23 C and say interior case temp is 28C, what will cool 38C water better... air at 23C or air at 28C ? You get 50% more cooling at 23C
If the air coming out of your top radiator is warm, it's up side down.
You have way more rad than me and I'm running way cooler with more load.
If you want to get the skinny on doing the thermodynamic calculations ... having taught college level fluid mechanics and thermodynamics we wanted to apprpoach this from a "calculations" point oif view and then perform lab testing to add any necessary constants. We worked with the data from Martins liquid lab and modeled dozens of builds. With designs based upon a Delta T of 10C,, accuracy never wavered more than 5%.
If you want to download the spreadsheet calculators for various rads... do a web search on "Radiator Size Calculator overclock.net"
4. One more thing ... are you creating negative pressure inside you case ? Generally negative pressure's downside is discussed in terms of dust. You should be less concerned with the dust than what is carrying it in.
Let's 'do the math. Likely won't match what ya got but the example holds.:
We have no data on the fans so lets assume that one of your 120mm fans = 1 "equivalent fan" or 1.00 EF ... that would make the 140s = 1.36 EF. So with a 480 and 420 blowing out , we must have at least:
4 x 1.00 EF = 4.00 EF @ 480 rad
3 x 1.36 EF = 4.08 EF @ 420 rad
1 x 1.00 EF = 1.00 at case rear
Total = 9.08 out
Again the actual numbers don't matter... change to fit what you got .
Now those exhaust fans have no intake filters so there's no intake restriction from dust clogging the filters which can restrict air flow up to 30% when dirty ... lets call it 20 % and assume (4) 140mm intake fans.
(4) x 1.36 x 80% = 4.35 EF
So with 4.35 EF coming in and 9.08 going out you have quite a air deficit there. That means the missing air is coming in thru your case grilles and vented slot covers .... and where are they ? Most times they are going to be right near your 300 watt GPU exhaust and your 1000 watt PSU exhaust. Fortunately, to see if this is happening, you can invest in a $39 "garage band fog machine. Mount your rads and fans .. or just the fans and run a test ... pointing the fog back at those open grilles and vents.... if your case fills up w/ fog, you are pulling air in ... if those grilles are next to GPU / PSU exhaust, its hot air.
www.performance-pcs.com
