BLAST FLOW Siberian Rev2 Modular VGA WaterBlock

Testing Methodology

Testing Methodology
For the testing phase of the review I have chosen to test the BLASTFLOW Siberian Modular VGA Waterblock against some other well known water-cooling blocks: the EK FC8800GTS; Swiftech MCW60, and the Alphacool NVXP-G8. A Laing DDC Pro pump with OCLabs alternative top running at 12v will be used to assist in making a comparison. I shall be looking specifically at pressure drop, flow resistance and cooling performance from within a water-cooling loop. All tests will be run 3 times to ensure the elimination of any oddities.
Variable psu @ 12v
I have included the setup details below:
Pressure Drop

For the pressure drop test I used a 25L portable water container filled with 20 litres of water, with a 1/2" plastic threaded barb placed in the bottom to represent the reservoir. A stop tap was inserted immediately after the 1/2" barb to allow for a faster water-block change. The True-Flow pressure meter was used to record the head pressure per 1 minute testing cycle. The pump was primed and let run for a short period to ensure that no air bubbles were left in the loop.

The first run made was with only the pump and pressure meter included in the loop and the water pressure noted. The absolute head pressure recorded for the Laing DDC Pro pump with OCLabs XP top was 33 kPa. For the second run the BLASTFLOW Siberian waterblock was included into the loop and the drop in loop pressure recorded. The same procedure was followed for the other waterblocks.

* 1 x Laing DDC Pro pump with OCLabs XP top @ 12v
* 1 x Alphacool NVXP-G8; EK FC8800GTS; BLASTFLOW Siberian and Swiftech MCW60 waterblocks
* 1 x Powertech variable DC power supply (quoted accuracy /- 0.2V)
* 1 x Multi-meter
* 25L portable water container
* 1 x Glycerine filled True-Flow pressure meter. (kPa/psi)
* 1/2" ID XSPC tubing
* 1/2" barbs
* 2 x stop-tap fittings
BLASTFLOW Siberian Swiftech MCW60
EK FC8800 GTS pressure drop Alphacool NVXP-G8 pressure drop

In a similar test to the pressure drop testing above, the flow test will highlight just how much the water blocks restrict the natural flow of the water-cooling loop. Utilising a very simple setup consisting of a pump, I/2" ID tubing, waterblocks, bucket and a stopwatch we will see how far removed from the absolute flow of the pump, that the waterblocks hinder flow. Running the pump into the bucket for one minute and then measuring the amount of water pumped will be the 'absolute flow' of the pump. The absolute flow recorded for the Laing DDC Pro pump with OCLabs XP top was 800 Litres per hour.
To calculate the flow-loss or restriction of each water block, they will each be included into the loop (one at a time) and the same procedure followed. The flow rate will be recorded in Litres/ hour. All simulations will be run 3 times each to ensure uniformity of the results and an average then taken.
Loop Simulation and cooling performance

I have replicated a watercooling loop similar to that in conventional water cooled setups, but it will include the GPU alone and should return consistant and unbiased performance results. The open loop that I have chosen to run with should give quite a good indication of how the BLASTFLOW Siberian waterblock would perform in your system. The BLASTFLOW Siberian and other waterblocks performance will be assessed at the Laing DDC Pro's operating voltage of 12 volts, simply because it is the typical voltage that the pump operates at.
For each seperate run, the pump was allowed to run for 20 mins to ensure the evacuation of all air from within the loop. The temperatures were taken at 30 minute intervals to allow them to 'settle'. RTHDRIBL will be used in order to simulate graphic load. Due to low maximum resolution of my testing monitor, RTHDRIBL will be run at 1280 x 1024 (4x Multisample). Whilst the small resolution isn't perfect for stressing the graphics card totally it should still give some comparitive results.

I have recorded temperatures at idle and load; all GPU related temperatures will be taken using RivaTuner vers 2.08 and water/ambient temperatures were taken using a common household mercury thermometer. The mercury thermometer was allowed 5 minutes to aclimatise to air and water and then the temperature recorded. Water temperature during the testing process was between 26.3 and 27.1 Degrees Celcius.
The setup used has been included below:

* 1 x Laing DDC Pro pump with OCLabs XP top @ 12v
* 1 x Alphacool NVXP-G8; EK FC8800GTS; BLASTFLOW Siberian and Swiftech MCW60 waterblocks
* 1 x Powertech variable DC power supply (quoted accuracy /- 0.2V)
* 1 x Multi-meter
* 1 x Radiical 120.3 Radiator
* 3 x Scythe Minebea 120mm cooling fans
* 1/2" ID XSPC tubing
* 1/2" barbs.
* 1 x Intel Q6600 processor
* 1 x ASUS P5B Deluxe wifi/App motherboard (bios version 1101)
* 1 x ASUS EN8800GTS graphics card (640Mb version)
* 2GB Corsair XMS2 PC2-6400 RAM
* Antec NEO EarthWatts 500W PSU
* 80 GB Western Digital SATA II HDD
Please follow with me over the page to see the test results...
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Most Recent Comments

11-03-2008, 07:27:35


11-03-2008, 08:19:52

Mr. Smith
Nice block, I almost got a rev1 a while back and they were going for £100.

I love the modular idea, detach block from GPU leaving loop in-tact, whack on new gpu plate, reattach block... Awesome. No draining the loop, no messing around.

THe only problem is you depend on blast flow staying in business and producing new plates for new gpus...Quote

11-03-2008, 08:47:11

Looks a nice block but I don't like the huge size of it (vertically)Quote

11-03-2008, 10:00:13

why cant they make a 2900 fitting Quote

18-03-2008, 17:48:33

I see that you stated that they are working on a 98x2 block but what about a 3870x2 block? or the upcoming 4###x2 series, can you see if they have any plans for this and I would assume that it would use two Siberian blocks. ThanksQuote

18-03-2008, 18:36:45

I'm not sure if it was covered in the review.. but can you use the memory cooling plates without the w/c block? I was thinking of going for the 8800GT plate to use along with my AC Accelero 'cos the horrible little memory sinks kept on dropping off.


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