Best low-resistance CPU block for AMD?

[Karantanec]

Generally speaking, what would be he best low-resistance CPU block for an
Athlon XP, in use with a Hydor L30 pump, 1/2" ID tubing and a system with several waterblocks in use (CPU, NB, GPU and possibly more)?

[Cathar]

Define "low resistance".

[j813]

Originally Posted by Karantanec

what would be he best low-resistance CPU block for an
Athlon XP, in use with a Hydor L30 pump, 1/2" ID tubing and a system with several waterblocks in use (CPU, NB, GPU and possibly more)?

Maybe you mean Low Flow "Resistance"?



Edit:
Or Low (Flow) Restriction CPU Block?

[AngryAlpaca]

Why would you want a low flow resistance block rather than a high performance one for the CPU?

[Karantanec]

Originally Posted by AngryAlpaca

Why would you want a low flow resistance block rather than a high performance one for the CPU?

By low resistance I mean a waterblock with minimal waterflow resistance (not low-flow)aka. high-flow and low resistance to the flow. (maybe i'm translating it wrong )

The system I'm designing uses as much straight, short, big tubing and as much unrestricted flow as possible and no bottlenecks to allow the use of several "low restriction to the flow" waterblocks in the system. I dont know how the Hydor L30 will handle the quite long travel path through the system, so I wanna use as low-restrictive blocks to allow maksimum unhindered flow throughout the system as possible...
The system is meant to run passively, so a stronger-louder pump with higher head-flow is out of the question - thats why all the fuss about "easy, unhindered flow" through the waterblocks (low resistance to flow to allough max head possible)

Hope that explains it

[AngryAlpaca]

I understand what you're saying, but you should be looking for high performance rather than low resistance. Your goal should be temperatures but it seems to be flow, which is usually a means to get a lower temperature and not an end result.

[Karantanec]

Originally Posted by AngryAlpaca

I understand what you're saying, but you should be looking for high performance rather than low resistance. Your goal should be temperatures but it seems to be flow, which is usually a means to get a lower temperature and not an end result.

Of course I meant a compromise between flow and efficiency.

Maybe I should refrase the question - which of the top10 performance blocks or types of blocks are also the least resistant to flow?
The pump category being a Hydor l30 -> medium flow pump?

[Ruiner]

http://www.procooling.com/html/pro_testing.php
Take your pick.

[Karantanec]

Originally Posted by Ruiner

http://www.procooling.com/html/pro_testing.php
Take your pick.

SO, the Litle River Cascade SS and similar models are still the best waterblocks except for really low-flow systems?

[AngryAlpaca]

Well, more accurately, they're the best waterblocks for higher flow systems. 1GPM or even 1.5GPM (where the MCW 6002 meets the WW, the closest in performance for easily available WB's) is not low flow by our definitions at all, and once a MCW 6002 is in your loop flow will probably be in the lower range of that.

[Karantanec]

Originally Posted by AngryAlpaca

Well, more accurately, they're the best waterblocks for higher flow systems. 1GPM or even 1.5GPM (where the MCW 6002 meets the WW, the closest in performance for easily available WB's) is not low flow by our definitions at all, and once a MCW 6002 is in your loop flow will probably be in the lower range of that.

I understand, but what the chart doesnt show is the waterblocks resistance to flow...
I can see that the Swiftech series is good for flow, but what other blocks are equally effective as a LR WW, but without the jet impingement and similar high-restrictive flow technology?

[greenman100]

misinformation in this thread is running buck wild

AA an easy target?

Ruiner's not helping either

First, to further define the goal:

Low restriction for a weak pump/multiple block situation, the justification could be there

the pro/testing page will not help you, as pressure drop figures are not available.

now make an educated decision, obtain pressure drop information for the said blocks, overlay pressure drop curve of waterblock, with fudge factor for rest of system on top of pump curve, take the data point at which the lne cross, go to C/W vs. flow, then start comparing

if it sounds too complicated, go to OCers, they'll spoonfeed (mis)information with no qualms
If you decide it's worth the effort, keep posting here

[rundymc]

mcw5002 is a good 'low flow resistance' waterblock to answer your original question- but as far as I see the Cascade seems to kick arse in low flow applications

[AngryAlpaca]

Perhaps I should clarify. The MCW 6002 has the same pressure drop as the WW, and about 25% more pressure drop than an RBX or a TDX. It has slightly less pressure drop than a Cascade, but I lack numbers for the Cascade. That 25% difference between the TDX/RBX and the MCW 6002 equates to a very small difference in flow, and the performance difference removes the bad effects of that flow difference with your apparent setup. The pressure drop of the CPU block becomes a much smaller issue if your other blocks are relatively restrictive.

[greenman100]

5002??????

[rundymc]

mcw5002

larger barbs, not at angle, less restriction than the original mcw5000
not sold by swiftech anymore, but I think some online stores should have stock
in any case, the mcw6002 will perform better due to its performance at relatively low flows- I see little reason to go for a hunt for its older bro if its easier to get hold of the 6002

[Karantanec]

Greenman100:
-WHere can I get the pressure drops for the most popular waterblocks? Is there a chart for that?

ANgryAlpaca
I dont see how an MCW has more pressure drop then a waterblock with jet impingement technology...

[AngryAlpaca]

It uses jet impingement. Also, it's filled with pins.

[Ruiner]

[quote=Karantanec]Greenman100:
-WHere can I get the pressure drops for the most popular waterblocks? Is there a chart for that?

QUOTE]
I recall Cathar quoting approx 1psi pressure drop for the Cascade at 1gpm. http://www.ocforums.com/showthread.php?t=266384

overclockers has results for other blocks here: http://www.overclockers.com/articles373/wbsum.asp

[Karantanec]

Originally Posted by AngryAlpaca

It uses jet impingement. Also, it's filled with pins.

The MCW series uses jet impingement? Sorry, I didnt know that.

The links were quite helpfull and I need to study it more, but what performance waterblock without jet impingement-accelerator nozzles does Pro/Forums suggest?

[BillA]

Karantanec
I think you are chasing words w/o understanding what is meant by their use

"low flow resistance"
does NO cooling, eh ? just maximizes the flow rate

when using an aquarium pump this is a useful approach, but will never result in performance equal to a system with a pressure capable pump and a moderately restrictive wb

you are designing a system that at best will be 4-5°C off of what is routinely available with a Swiftech kit ??

the flow restriction in well designed wbs is why they work, not a bad thing at all

[Karantanec]

Originally Posted by unregistered

Karantanec
I think you are chasing words w/o understanding what is meant by their use

"low flow resistance"
does NO cooling, eh ? just maximizes the flow rate

when using an aquarium pump this is a useful approach, but will never result in performance equal to a system with a pressure capable pump and a moderately restrictive wb

you are designing a system that at best will be 4-5°C off of what is routinely available with a Swiftech kit ??

the flow restriction in well designed wbs is why they work, not a bad thing at all

I might be chasing words, but the meaning should be obvious.

OF COURSE the block would have flow restriction - But what I'm trying to find is a waterblock that can come close to top-cooling waterblocks, but without their usual high restriction to flow.

I dont think that's unreasonable.

[nikhsub1]

Originally Posted by Karantanec

I might be chasing words, but the meaning should be obvious.

OF COURSE the block would have flow restriction - But what I'm trying to find is a waterblock that can come close to top-cooling waterblocks, but without their usual high restriction to flow.

I dont think that's unreasonable.

I think the big question is why? Why does it matter how restrictive the block is? Isn't performance what matters? I could probably find a block that would increase my flow by 1/2 or so, but at what point?

[BillA]

its always refreshing to hear that wb designers have missed the obvious
perhaps Cathar's new wb ?

[Cathar]

Originally Posted by Karantanec

what I'm trying to find is a waterblock that can come close to top-cooling waterblocks, but without their usual high restriction to flow.

I dont think that's unreasonable.

Whether you think it's unreasonable or not isn't that relevant. What people here are saying is that such a block doesn't really exist.

Still - since you're pushing the issue, perhaps the BeCooling SlitEdge or the Swiftech MCW5002 may be the closest thing to the answer you're looking for - but for what reason I still fail to understand.