Thermalright XWB-01 Water block Flow Rate Testing
Introduction
Welcome to my pressure drop testing of the Thermalright XWB-01 Waterblock for processor. This page will focus on the pressure drop and flow characteristics only for this water block only. I will follow up at a later date to assess thermal performance when I've completed construction of my die simulator testing setup.
First off I want to give special thanks Gary from Sidewinder Computers for providing me with the water block sample to review. I've ordered from Sidewinder many times and it's always been a pleasure repeatedly finding my next favorite part there as they typically are priced lower than many others. They are also committed to helping the water cooling community further develop an understanding of water cooling and I have seen them provide testing parts to several water cooling forum members. I highly recommend giving Sidewinder Computers a try on your next shopping adventure:
Block Characteristics
The block is an all metal
construction block that with a micro pin style design that include a
chrome plated brass machined top, a punched and pressed chrome plated
steel hold down plate, a punched steel mid-plate, and a
punched/machined copper base with an micro-pin insert.
The block packaging is done in Thermalright's typical brown box with black letter packaging and the
block itself is nicely packages in solid foam to prevent damage during
shipping. I was very pleased with the package, personally I
prefer the brown box (less wasted cost on something getting recycled anyhow).
And look here, it comes with a back-plate!, barbs, hose-clamps, and the necessary screws. Unfortunately the back-plate is not a stud type, it is a front loading type that will require motherboard removal during maintenance removal. You could however modify the mounting screws by replacing them with studs, plastic nuts, and waters and still utilize this back-plate in a normal stud system that would allow future access without removal. It's also nice to see enough thermal grease for the next 10 years worth of applications, that's a lot of "thin line" applications.
And look here, it comes with a back-plate!, barbs, hose-clamps, and the necessary screws. Unfortunately the back-plate is not a stud type, it is a front loading type that will require motherboard removal during maintenance removal. You could however modify the mounting screws by replacing them with studs, plastic nuts, and waters and still utilize this back-plate in a normal stud system that would allow future access without removal. It's also nice to see enough thermal grease for the next 10 years worth of applications, that's a lot of "thin line" applications.
At first inspection I had thought
the barbs were not G1/4 because the chrome coating on the threaded top
was very tight for D-Tek barbs, but after appling a little more force
with some DD high-flow barbs, they did thread right in there. The
stock barbs are a bit smaller on the inside diameter, although the
primary contribute to restriction is going to be the pin matrix.
The stock barbs do have nicely retained o-rings which is a very
welcome sight. Hopefully thermalright will considered opening the
ID of their own
barbs to a nice 10.0 or 10.15mm ID to match other high flow options.
The barbs are very nice other than the smaller inside diameter at
the threads.
One thing I noticed is the chrome coating on the brass top appeared to
have a lot of tiny little chrome bubbles on the hidden interior. This shouldn't have any
effect on performance, but it caught my attention.
The copper pin matrix appears to
be manufactured separately as you can see it's not perfectly aligned
with the square socket that it sits in. Upon closer inspection
you can see trace amounts of solder around the perimeter and I suspect
the pins are actually punched from thin sheet metal copper material and
stacked
together to form the pin matrix which is then soldered into place.
This is a clever way to manufacture a micro pin matrix at a low
cost, but it does introduce a solder interface between the two pieces
of
copper which may not transfer heat as well as a solid machined, cast,
or forged copper construction. In the end it is a nice micro-pin base,
the pins are very very fine (one of the finest I've seen). The pins are
hard to measure, but visually appear to be around 2-3mm tall.
The mid-plate and mid-plate washer forces water appropriately down into the pin matrix and out radial in direction to the exits slots that return water to the outlet port. I anticipate these design features add up to a very well performing block.
The mid-plate and mid-plate washer forces water appropriately down into the pin matrix and out radial in direction to the exits slots that return water to the outlet port. I anticipate these design features add up to a very well performing block.
Hydraulics and Pressure Drop Testing
The most scientific way to determine a blocks hydraulic resistance is to test pressure drop. Pressure drop is a measurement of pressure loss across a block that varies with flow rate. This is basically a measurement of energy loss, and directly influences how much flow rate you will have.
- Dwyer Digital Manometer 475 Mark III - Accuracy .5% of Full Scale. Range 0-200" W.C., Resolution .1" W.C.
- King Instruments 7520 Series 0-5GPM, 250mm scale - Accuracy 2% of Full Scale. Range 0-5GPM, Resolution .1GPM (can be interpolated to .02GPM)
- Water Source - Household water pressure - 50PSI at >5GPM - Because flow rate readings are instantaneous, household tap water and water pressure are a good and powerful source for pressure drop testing.
And to get a better sense of restriction comparison, here it is with several other curves. It follow very closely to that of the EK Supreme and somewhere between the 4.4 and 5.5mm nozzle with the fuzion.
With both water-blocks and
radiators there is always a game of tradeoffs between restriction and
thermal efficiency. More restrictive blocks tend to incorporate
nozzles or very fine pin matrixes or combinations of the two that
simply cause some restriction to gain higher water
velocities and turbulence which assists with improving thermal
performance. This design has chosen to follow a more restrictive
path for improved thermal performance, they don't necessarily go hand
in hand, I just wanted to say it's a fair tradeoff when it comes to
water-block and radiator design.
I would simply suggest that you plan out your system more carefully with high restriction items. High restriction blocks go very well in single block loops because any impacts to flow rate have no effect on other blocks in the same system, only the radiator which are generally very resilient to flow rate impacts. I would recommend due to this higher restriction that you simply check flow rate on a designed system and ensure 1GPM is maintained. This is a good rule of thumb flow rate point where gains beyond mean less than a couple of degrees.
I would simply suggest that you plan out your system more carefully with high restriction items. High restriction blocks go very well in single block loops because any impacts to flow rate have no effect on other blocks in the same system, only the radiator which are generally very resilient to flow rate impacts. I would recommend due to this higher restriction that you simply check flow rate on a designed system and ensure 1GPM is maintained. This is a good rule of thumb flow rate point where gains beyond mean less than a couple of degrees.
Thermal Testing Link
Until I've completed my own
thermal testing, I thought I would provide you a link to thermal
testing provided by the good folks over at Hardware Canuks.
Hardware Canuck's Thermal Testing Link
Their results indicate the block does perform well and similar to an Apogee or stock Fuzion on a quad core. Unfortunately there was not a comparison with a Fuzion in full fighting nozzle gear or an EK supreme that would more closely match the restriction the Thermalright block produces. Typically I've seen users report approximately 2-3C gains with a nozzle/washer on the fuzion, so it would be a tough race for the top.
Regardless, this is very good thermal performance and considering Thermalright's track record for dominating the heat sink market, I'm not surprised to see it perform so well even if it is one of thermalrights first water blocks. Can't wait to see what they have up their sleeves next.
Hardware Canuck's Thermal Testing Link
Their results indicate the block does perform well and similar to an Apogee or stock Fuzion on a quad core. Unfortunately there was not a comparison with a Fuzion in full fighting nozzle gear or an EK supreme that would more closely match the restriction the Thermalright block produces. Typically I've seen users report approximately 2-3C gains with a nozzle/washer on the fuzion, so it would be a tough race for the top.
Regardless, this is very good thermal performance and considering Thermalright's track record for dominating the heat sink market, I'm not surprised to see it perform so well even if it is one of thermalrights first water blocks. Can't wait to see what they have up their sleeves next.
Price Considerations
Prices as of 4-7-2008
Considering the inclusion of the back-plate and all metal construction, that makes the Thermalright XWB-01 a noteworthy price competitor as well.
The Thermalright XWB-01 is a very well performing nozzle style block with an ultra fine micropin matrix!
Where to Buy
Sidewinder Computers Thermalright XWB-01