What happend to the Nexxos XP review?

[jaydee]

Originally Posted by pHaestus

Looks like they made referrals from proforums point to that page. You can do the dragondrop and it works still. As for why, well who can say why jmke and co does anything?

I just went directly to madshrimps.com and it's fine. Just wanted to make sure I wasn't the only one. Talk about some childish/pussy bullshit. I am not even going to waste my time on Liquids article.

[nikhsub1]

Originally Posted by JWFokker

I don't recall seeing any performance stats on DangerDen's or Swiftech's websites.

LOOK again. Ever since Bill moved to Swiftech there is performance data.

*Edit* I see Bill has beat me to it, I was so busy wasting my time reading 'other' things lol.

[pHaestus]

you mean porn, right?

[jaydee]

Originally Posted by pHaestus

you mean porn, right?

What else rivals water cooling? :shrug:

[BillA]

what else necessitates water cooling ?

[Etacovda]

Why do you make me picture such things Bill

** Etacovda imagines swiftech loop with porn bass

[BillA]

er, that would be the large mouth bass ?

[Etacovda]

/retreats back to garage to weld on a new cross member onto car for warrant of fitness

I know when im beat



I'd have to say though, that this latest bout of testing has become extremely interesting - great to see some pump + block numbers too.

[nikhsub1]

Originally Posted by pHaestus

you mean porn, right?

Would you expect anything butt?

[Blackeagle]

Cathar, thanks for the fine graphing work.

I've gotta save those graphs until such time as you're done tweaking your program. Nice work.

[lolito_fr]

Ok, this is a continuation of Cathars' C/W vs Hydraulic Power graph idea, and some of the discussion above. (not porn related though )

I have decided to integrate the dT from the HE120.2 rad into my waterblock dT graphs for the Nexxos XP and MCW6000, so that, hopefully, the result is a graph of CPU-ambient dT vs water flow rate. *Cringe*

I used this rad mainly because Cathars' PQ curves for the Nexxos and MCW6000 already include the rads flow resistance (as well as 2m of 1/2" tubing).
The air flow rate corresponds roughly to 2 Papst 4312L @ 12v.

Power into the waterblock is 71W as per PHs' testbed, and this power is assumed to be fully dissipated by the rad.
Note that I have not included pump heat... will have to deal with that issue another day





Also please consider this as strictly experimental

edit:

pH, where is the interactive system graphing tool?

[brucoman]

Originally Posted by unregistered

er, that would be the large mouth bass ?

walleye here please

[pHaestus]

lolito_fr:

Now THAT'S interesting. Would it be possible to put a few points on the curves for where systems with different common pumps would intersect?

[lolito_fr]

Its DAMNED interesting!
I have edited my above post to add a bar chart giving hydraulic power for commun pumps in these two systems. I was too lazy to add all the Iwaki pumps, so yeah there is a giant leap between the MCP650 and 30RZ!!
Surprisingly, there is very little difference between the pumps useful output in these 2 loops, hence the pump heat factor would probably make very little difference to the relative performance of these two loops...

[pHaestus]

lolito_fr:

I quoted your post in this thread, which I also stickied. I was thinking it'd be better to concentrate this hydraulic power graphing work in that one thread and try to keep all the thoughts in one place. It's very encouraging though; I think it is perhaps the easiest way to graphically show relative wb performance in real loops to end users.

[lolito_fr]

pH, I think what the average Joe wants to see is something like this:



needs a disclaimer though (in this case at least )

edit: have replaced graph with new one factoring in pump heat as per Cathars data

[pHaestus]

Just what you'd expect from a wb that "has optimal performance at low flow" vs. an "American block aka high flow" right? lol

Yes that's what people want. It's great to see so many of you guys able to take data I generate and turn it into something USEFUL.

[DDogg]

OK, I'll ask the question for all of us good with a wrench, but not with a calculator. What am I seeing in the graph above?

[pHaestus]

Look at lolito's last graph. What he's done is combined

1) my test results for the waterblock (the difference between CPU temperature and water temperature going into the block as a funciton of flow rate)
2) His test results for a thermochill 120.2 radiator (difference between water temperature and air temperature as a function of flow)
3) Cathar's flow rate tests (actual flow rate through the waterblock + thermochill 120.2 + hose using different pumps)
4) the manufacturer's performance curvs for different pumps (pressure vs flow).

The final result is that he's able to predict the difference between CPU temp and room air temp using (a) a thermochill 120.2 and the stated Papst fans (b) a loop made with 2 meters of 1/2" tubing, (c) either a MCW6000A or a NexXxos XP waterblock for a variety of pumps (the Eheim 1046, 1048, 1250, MCP600, and MCP 650). Look at the pump that generates the least power (1046) and you can see that the MCW6000-A performs slightly better than the NexXxos XP. Look at the pumps with higher max flow rates and pressure capacities (and therefore a larger hydraulic power) and you can see that the NexXxos XP pulls substantially ahead.

What's going on is they are taking my rather artificial testing and converting it to something useful for "real world" component recommendations.

[bellevegasj]

I'm really suprised how well the NexXxos performs in a high flow system. Very impressive. It seems like too much performance is lost using 8mm, 10mm low flow systems.

pH, did you decide not to explain hydraulic power in depth?

[Cathar]

Originally Posted by bellevegasj

I'm really suprised how well the NexXxos performs in a high flow system. Very impressive.

The NexXxoS XP is a "high flow" block, despite what you've been told.

[9mmCensor]

Originally Posted by lolito_fr

pH, I think what the average Joe wants to see is something like this:



needs a disclaimer though (in this case at least )

edit: have replaced graph with new one factoring in pump heat as per Cathars data

That graph is freakin awesome!!!!

[pHaestus]

For hydraulic power discussion see this most excellent thread

Basically it's just flow rate * pressure drop * a conversion to get to a final unit of "W". The beauty is that it combines the ease of comprehension of dT vs flow graphs with the necessity to include dP vs flow info to be predictive.

And we never said it was a low flow block or that low flow was ever desireable. I suggest that you complain to the "experts" who did.

[bellevegasj]

Originally Posted by Cathar

The NexXxoS XP is a "high flow" block, despite what you've been told.

I see that now. I'm still fairly new to water cooling and thought that the European designers had created some kind of water cooling system/block that actually did perform better at lower flow rates than it did at higher flow rates. It didn't seem realistic that you could have a system with lower flow rates that is quieter and cool better at the same time.... but anything's possible, I suppose. And from what I've read from various sources on the web, that was my understanding of the European water cooling philosophy.

Originally Posted by pHaestus

For hydraulic power discussion see this most excellent thread

Basically it's just flow rate * pressure drop * a conversion to get to a final unit of "W". The beauty is that it combines the ease of comprehension of dT vs flow graphs with the necessity to include dP vs flow info to be predictive.

And we never said it was a low flow block or that low flow was ever desireable. I suggest that you complain to the "experts" who did.

Thank you for the link pH. I didn't mean to imply that you or anyone here said that it was a low flow block, but that was the impression I got from reading various websites. I will read the hydraulic power thread a couple times before I hit you up with my dumb Qs. =)

[Cathar]

Originally Posted by bellevegasj

I see that now. I'm still fairly new to water cooling and thought that the European designers had created some kind of water cooling system/block that actually did perform better at lower flow rates than it did at higher flow rates. It didn't seem realistic that you could have a system with lower flow rates that is quieter and cool better at the same time.... but anything's possible, I suppose. And from what I've read from various sources on the web, that was my understanding of the European water cooling philosophy.

This is not a go at you, but rather the marketers (web-sites included) who push that story out to everyone on the web:

You can state anything you want about a product when you ignore those horribly inconvenient laws of physics, which do exist and do apply, regardless of whether you believe them or understand them properly.