XSPC Razor 3870 GPU Block Flow Testing
Welcome to my pressure drop testing of the XSPC Razor 3870 block for a wide range of chipsets.
This page will focus on the pressure drop and flow
characteristics only for this water block only. First I would like
to give special thanks to Paul from XSPC for providing me with a sample
to test, I have yet to try and XSPC product that didn't impress me.
Being the engineer that I am, I tend to take notice of the small
tweaks here and there that make a product perform well, and XSPC
obviously spends a lot of time working on improving their own designs
and it shows.
The block is a finely CNC machined block. Unlike other GPU full
coverage blocks, this one is machined from a solid piece of copper
ensuring the best heat transfer to all parts of the block. The
top is a blue tinted acrylic top which include two pre-drilled
locations for LEDs. The block comes very well packaged with one
LED to get you started and all of your standard hardware for
The next thing you'll notices is
the attention to detail here where XSPC has actually sharpened the
inlet and outlet fins to minimize energy losses at the fins. This
small attention to detail is likely contributing to it's low pressure
drop. It's very refreshing to see this attention to detail in the
And the back exhibits very nice machining work. As you can see the most
critical areas are machined with a very large fly cutter to ensure
flatness and all edges are CNC chamfered for that extra fine finish,
more attention to detail.
Hydraulics and Pressure Drop Testing
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.
Digital Manometer 477 Mark IV - Accuracy .5% of Full Scale. Range 0-20.00 PSI range, Resolution .01 PSI
Instruments 7520 Series 0-5GPM, 250mm scale - Accuracy 2% of Full Scale.
Range 0-5GPM, Resolution .1 GPM (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 my results are as follows, the
pressure drop is the best I've tested to date for a 3870 GPU block, it
appears those "Razor" GPU area fin details do help with this:
Granted the difference is relatively small to the EK, but it is a lower
pressure drop which is likely a result of the Razor fins.
The XSPC Razor 3870 is King of the full coverage 3870 blocks for low pressure drop to date!
- Solid Copper Base for all components cooled ensures maximum heat transfer
- Very fine machining finish and chamfered edges.
- Razor GPU fin leading and trailing edges minimize entrance/exits losses, improving flow rates.
- LED mounting holes
- 4 ports for flexibility in tubing routing and SLI
- Dual slot thickness (most are, just something to be aware of)
I'm really impressed with this full coverage GPU block. Having my
own milling machine and having made my own blocks, I must say the
machining finish on this block is outstanding and it is very finely
crafted. While I won't have a chance to test thermals on it yet,
it has characteristics with the solid base, and fin thickness that
should put it up near the top performing of full coverage blocks.
In additional XSPC and their attention to detail has improved the
typical GPU fin area by incorporating their "Razor" leading and
trailing edges which reduces pressure drop and will improve flow rates.
The quality and design of this block is excellent!
Where to buy
XSPC Retailers Link