EK-CoolStream RAD XTC 420

[PaddieMayne]

Simple question really i have one of the above and im wondering if anyone knows the TDP cooling ability of this rad or where i can find out?

The rad has 6 x 140mm fans in push pull.

As im wondering if its capable of cooling my FX9590 ocd to run on all cores at 5ghz plus 2 x GTX780ti in SLI.

 

[Boonstick]

Im not sure if this is any help but I have the same rad and also a 280, both rads in push cooling i54670k OC'd to 4.2ghz, motherboard & 2x GTX780Ti in SLI and get really decent temps.

Id say you probably should try and squeeze in another rad somewhere if possible.

 

[JR23]

Given a stupid fan speed and delta T (difference between air and water temp) i'm sure practically any radiator 'could' dissipate the required amount of heat. But at a realistic fan speed it might not be possible, I guess that's entirely for you to decide.

I can't find any data on the XTC420 but just as a ball park set of numbers here's a 360 UT60 fan speed vs heat dissipation graph (for a delta T of 10deg) which I think it's safe to assume will be similar, perhaps a little worse performing.

As you can see you can't shed that much heat at sensible fan speeds, push/pull won't buy you much room either. I would of thought a triple and a dual or a pair of triples would be the least you could comfortably get away with, obviously a little discretion would be advised for what you deem acceptable temps/fan speeds/rad thickness/120 or 140 etc...

I'm still learning and reading around the subject myself so don't take only my word for it but it sounded legit. JR

 

[Dragolu]

It sounds like a simple question but it is really not so simple. It depends on the type of fans you are using as well as the speed. The ones on this graph are Ultra Kaze's which push a lot of air but are very noisy. Push pull ads some but not that much to the equation.
In general I think you are asking too much of a single rad for that setup. My estimation would be at least 2 360's/420's and that would be cutting it close. The TDP for your processor at 5 ghz is around 220-250 and each 780TI is 250 so that is 750 watts for the combined system. To give you an idea for the above rad you would have to run 2 360 rads with the Kaze's at 1400-1600 RPM to dissipate it at a 10 degree delta.
However as said before it depends on what temps you are willing to tolerate as well as the level of noise. Bare in mind that when you undersize the radiator surface like that air cooling may be more effective than water. A lot of the time it is not worth the expense if you will get worse results.

 

[PaddieMayne]

No worries guys ive decided to replace the rad with this..

http://hardwarelabs.com/nemesis/nemesis-products/nemesis-gtx/nemesis-420gtx

Recommended Capacity Stealth Supercruise 8-Core CPU GPU SLI/Crossfire FANS
120GTX 450W ■ ■ ■ 1 1 X 120mm
240GTX 1000W ■ ■ ■ TRIPLE 2 X 120mm
360GTX 1800W ■ ■ ■ QUAD 3 X 120mm
480GTX 2200W ■ ■ ■ QUAD 4 X 120mm
140GTX 550W ■ ■ ■ 1 1 X 140mm
280GTX 1200W ■ ■ ■ TRIPLE 2 X 140mm
420GTX 2000W ■ ■ ■ QUAD 3 X 140mm
560GTX 2500W ■ ■ ■ QUAD 4 X 140mm
http://hardwarelabs.com/nemesis/nemesis-products/nemesis-gtx/nemesis-420gtx#performance-chart

 

[JR23]

Wow i'm amazed 6000 RPM deltas qualify as 'stealth'. Don't get me wrong, it's a nice radiator, maybe even the best, but do you really think it can dissipate twice the amount of heat as an Alphacool does at 3k RPM.

Just look around, who on the forums has a pair of top end cards in SLI and bonkers overclock with only one radiator, most people are rocking twin 360's at least.

JR

 

[PaddieMayne]

Where did you get 6000rpm fan speed delta's from? Am I missing something? As far as I knew those top ratings were for a single set of fans at 900rpm.

 

[JR23]

They make some impossible claims in their 'performance chart' or more to the point neglect to tell you certain things which drastically effect the validity of what they are saying when you compare it to other brands radiator statistics.

As a practical example a mining rig set up ran as follows:
RADIATOR NEMESIS® 240 GTS®
FANS: 4 x Corsair SP120 (PUSH/PULL) *high rpm fans
LOAD: 2 x 280x
Ambient: 30C (hot in here)
Coolant Flow: 400lph
Mining temps: <60C
Gaming temps: <45C

Source: hwlabs on techpowerup

So here you can see with a pair of 280x's ~500 watts of heat is being dissipated with a 240mm radiator which yeah on paper sounds great and is very similar to your case of dissipating ~700watts with a 420mm radiator. But firstly that's with 2350 RPM fans in push/pull, which is excessive. And secondly the peak temp is <60c, with an ambient of 30c that would make the delta T around 25c which is again stupid and defies the point in water cooling. A delta T of 10c would be ok, around 5c being ideal and really even less just to ensure overkill.

Any radiator can dissipate a huge amount of heat in watts with a high difference in temperature between the water and the air. That's why manufacturers will rarely ever quote such a statistic because it's totally irrelevant without knowing all of the other variables.

Can you see how HardwareLabs said the 240GTS could dissipate 1000watts of heat, great. But then in practice when even they tried to validate that it took a full set of 2350 RPM fans and resulted in a stupidly high temparature just to dissipate 500watts. You can make your radiator marginally more efficient, but you just can't cheat Thermodynamics.


So is what i'm saying to you is you need to decide 1. How much heat you need to dissipate 2. what temperatures will be acceptable and 3. how fast you want to run your fans and from that you can figure out how much radiator space you will need. Having a thicker rad, thinner rad, better rad or push/pull won't have a massive impact on the area. A really general rule would be 240mm per CPU/GPU. Cooling 700watts of kit queitly and well with a 420mm radiator is a monumental ask.

JR

 

[Dragolu]

I am very skeptical that even with high rpm deltas (turbines) they would get that kind of preformace out of this radiator and they don't state key variables such as deltas, fans used, etc. I own a Hardware labs GTX 360 which is considered one of their best radiators. It is thicker and has higher FPI than this one. This is its preformace review by Martin before he retired.

http://martinsliquidlab.org/2012/04/09/hardware-labs-gtx-360-radiator/4/

From personal experience i had 2 nvidia GT 480's and an i7 930 oc @4.2ghz so aprox 800w in a loop with the gtx 360 and a 240 rad (35 mm) with gentle typhoons at 1840 rpms and it could bearly keep up with load temps of 70 c. In a decently ventilated case.

My current loop is a 4770k oc @4.7ghz and a gtx 780 in a loop with dual D5's an alphacool ut45 480, the GTX 360 and the 240 housed in a corsair 900d and temps are in the 50's at load with the fans at 1000 rpm. It is definatly overkill but very quiet.

 

[Warchild]

Personally I would say get another rad in there.

Im running at a 4.4Ghz CPU with 2 OCed 780s in SLI (mild OC)
but with a XTX360 and XTX240 in a single loop my temps were 52 on the CPU and 40 on the GPUs after a good few hours in BF4. And this is via a 144hz screen.

All in push/pull config. Really not sure if you could get your ideal temps with the CPU pushing 5ghz

 

[PaddieMayne]

Sorry guys i maybe should of informed you that my rad is out side under my car port but in the fresh air it has 6 x Phobya G-Silent 14 1400rpm Black running at 100%.

 

[SuB]

If it was me mate, I'd get a bigger rad or get two, just to be sure/safe Having them outdoors is great (and obviously works) adding another rad out there should require very little work? Add to that the fact that I assume you can't hear any fans on it and you've got the potential to just run the thing in a bloody fridge (have you considered this?)

Have to say, this really is proper dedication to the cause, chuckin' a radiator on the outside of your house. Don't see it that often these days Props mate.

 

[PaddieMayne]

Thanks buddy, but yeah this WC lark is totaly addictive, needless to say that in winter my temps rock, haha.

Anyway heres what im thinking for the upgrade..so purchasing another 420 ek xtc rad to match the one i have..

Or is this crazy and i should just upgrade to a single..
http://www.watercoolinguk.co.uk/p/Alphacool-NexXxoS-UT60-Full-Copper-560mm-Radiator_25162.html

 

[SuB]

I would definitely not have 2 sets of fans on top of each other, they screw up if you stack them

 

[PaddieMayne]

OK, but you dont think a single 560mm 4x140mm rad will do it?

 

[SuB]

I mean more like fan | rad | fan | rad | fan instead of
fan | rad | fan | fan | rad | fan

 

[PaddieMayne]

Again lol, so you dont think id be better off with a single 560mm rad rather than overkill with 2 x 420mm rads ?

 

[SuB]

if you can mount a single 560, that will be fine yeah

 

[PaddieMayne]

OK heres the new baby (560mm Alphacool NexXxoS UT60 Full Copper 560mm Radiator/8 x NZXT FX-140LB fans) that will be replacing my outdoor rad, it seems huge !

​

 

[SuB]

Dayum, that's mashoosive

Also. is that a freakin' Bren Gun?!